Main causes of cast steel shot consumption and its recycling and utilization

As the surface material of shot blasting machine, cast steel shot is used in a large amount and consumed a lot. But what is the main reason that affects the consumption of cast steel shot?

　　1. Adjustment of equipment such as shot blasting machine, different angle of shot blasting, different degree of consumption rate of shadow Cast Steel Shot for S460. The faster the shot blasting speed, the greater the consumption of cast steel shot. The inner wall of shot blasting machine is damaged and not repaired in time, the mud core bone of bridge shell is not pulled out in time before cast steel shot, the shot blasting process takes a long time, the top track of cast steel shot blasting machine is not sealed, and the scattered cast steel shot is not recovered in time. Utilization can affect the utilization efficiency of cast steel shot.

　　2. Surface roughness of the cleaned material. The higher the roughness, the greater the consumption of cast steel shot.

　　3. The amount of sand adhering or the grade of rust on the surface of the treated workpiece.

　　4. The cleanliness grade of the workpiece whose hardness has been cleaned.

　　5. The arc height requirement of the strengthened work.

　　After using cast steel shot, many manufacturers put them on hold because the sand is broken or the mortar is difficult to handle. Some of them are directly dumped as garbage, and a lot of resources are wasted. In fact, the value of cast steel shot after use is quite high, just to deal with the trouble points. The sand after blasting and polishing with single cast steel shot material can be sold back to the manufacturer. After screening and crushing, the manufacturer can get small size sand. It can also be sold to mechanical weighing enterprises as weighing material or to chemical companies after using mortar mixture as raw material.

　　Recycling and reuse of steel balls not only reduces environmental pollution, but also protects resources, increases the benefits of enterprises and improves the use value of cast steel shot themselves.

Characteristics of cast steel grits from Reaguan

Cast steel grits has some special advantages, such as moderate hardness, strong resistance and impact resistance. Cast steel grits can be reused several times in succession. It has long life, good elasticity, strong adhesion, fast finishing speed, low sand consumption, non-breakage and high brightness of finishing workpiece.

　　G16 Cast Steel Grit is made from high carbon cast steel shot by crushing into sand grains, then tempering into different hardness to meet different needs. The treated cast steel grits is sorted by screen mesh to meet SEA standards to meet the needs of sand blasting. Cast steel grits is widely used in the pretreatment of iron and steel workpieces before painting. The angular shape and relative hardness of cast steel grits make them clean up faster and recover more effectively. Cast steel grits is also widely used in the sand cleaning process of castings. Sometimes the cast steel grits will be embedded in the castings at excessive high temperature, which exceeds the clearance capacity of steel shot. When the shot blasting equipment can not effectively clean the steel workpiece, cast steel grits can be used at this time.

　　High-quality cast steel grits is uniform in size, good in particle size, suitable in hardness and long in service life. Cast steel grits has the characteristics of moderate hardness, strong toughness, impact resistance, continuous repeated use, long service life, good elasticity, strong adhesion, fast cleaning speed, low sand consumption, no breakage, high brightness of cleaning workpiece, good technical effect, etc.

Protective Measures for Weakness of Stainless Steel Tee

1. Strictly control the quality of raw materials, starting with the material of pipes.

　　Strict on-site inspection of stainless steel pipe and Stainless Steel Tees. To ensure that the material meets the requirements. Considering both economy and function in material selection, under special operating conditions, austenitic stainless steel, duplex stainless steel, titanium and titanium alloys, glass fibre reinforced plastics with stronger corrosion resistance and high nickel content can be selected.

　　When choosing materials, the corrosion margin of pipe and High quality Seamless Stainless Steel Tee should be increased to meet the service life requirement of pipeline system.

　　2. Surface Coating Protection

　　At present, in view of the corrosion situation ofStainless Steel Tee pipeline under the environment, besides choosing the material with strong corrosion resistance, it can also improve the corrosion resistance by coating the surface of Stainless Steel Tee. Aiming at the problem of smooth surface of Stainless Steel Tee base material and poor adhesion of conventional stainless steel anti-corrosion coatings for different diameter pipes, an effective anti-corrosion coatings for stainless steel in marine environment, epoxy powder coatings, has been developed. The coating is a new type of coating which is completely solvent-free and sprayed in the form of powder.

Characteristics of stainless seamless steel pipe

　It puts forward new requirements for seamless steel pipe industry to adapt to national economic transformation and future development. This is the need of harmonious and sustainable development of seamless steel pipe industry and enterprises in the future, which brings challenges and opportunities.

　　The thicker the wall thickness is, the more economical and practical ASTM A312 SS304 Cold Rolled Stainless Seamless Steel Pipe will be. The thinner the wall thickness is, the higher the processing cost will be. Secondly, the process of the product determines its limited performance. Generally, the precision of seamless steel pipe is low: uneven wall thickness, low brightness of inner and outer surface, high cost of sizing, and the pitting and black spots on inner and outer surface are not easy to remove; thirdly, its detection and shaping. Stainless seamless steel pipe must be dealt with offline. Therefore, it embodies its superiority in high pressure, high strength and mechanical structure materials.

The market price of ERW Pipe will present a turbulent pattern

　The surge of snails resulted in a significant volume of spot ERW Pipe market transactions. The high settlement price of local steel mills and the price policy of not making up the difference showed a strong willingness to bid. Most other businesses had completed sales volume, so the price went up in an all-round way. At present, external favorable factors dominate, downstream demand release is limited, and the trading performance of ERW Pipe market is general. At the beginning of the month, the pressure of business resources slowed down, and the market of ASTM A178 Carbon Steel ERW Pipe willingness to buy goods at low prices weakened.The short-term trend of billet and snail is uncertain, which has great influence on market price. Considering the above, in the off-season, the market price is still lower, but in the short run, if the billet is boosted,ERW Pipe may still be higher.

　　IERW Pipe is anticipated that the main reason for the stable operation of the ERW Pipe market next week is that the market will enter the off-season and the demand is general. However, the trend of the steel billet snails can boost the mindset of the spot merchants. The market has a strong wait-and-see atmosphere and the quotation will follow the market. In addition, at the beginning of next week, the financial pressure of the ERW Pipe market will be slightly slower and the overall trend will remain stable.

How to prevent decarbonization of galvanized pipe surface?

Galvanized pipe are high-quality steel products, using leading scientific skills to produce standard and thorough products, but also for many new and old customers in society, according to the needs of customers to customize different types of galvanized pipe. Galvanized pipes are widely used, such as large-scale lifting machinery manufacturing, large-scale conference and exhibition hall roof layout, shelves for storage of goods, also used in large venues and so on. Q195 Galvanized Pipe for Construction production for all aspects of social effectiveness, quality and quantity.

　　With the development of industrial skills, galvanizing skills have become an upsurge. Galvanized pipes are the analogy of galvanizing skills. Galvanizing technology is to cover the surface of steel with thick and fine pure zinc layer, which can prevent the contact between steel and corrosion solution, and protect the steel matrix from corrosion. Galvanizing, also known as dipping galvanizing, is different from galvanizing. Galvanizing technology. Hot dipping galvanizing is a very good coating method for protecting iron and steel matrix. In liquid zinc, after physical and chemical disposal, the steel workpiece may be disposed of in molten zinc at a higher temperature. The steel matrix reacts with the liquid zinc, and the pure zinc layer covers the whole surface of the steel workpiece. The galvanized surface has a certain tolerance, can withstand a lot of resistance and impact, and has excellent contact with the matrix. This method not only has the corrosion resistance of galvanizing, but also has the strong corrosion resistance of galvanizing. Therefore, the plating grid is used in various strong acid, alkali mist and other corrosive environments.

Basic requirements for hydraulic test of API 5CT oil casing

Hydraulic test of API 5CT oil casing is an indispensable part of steel pipe manufacturing process. Its function is to test the leak resistance of steel pipe under standard test pressure and voltage stabilization time. Like X-ray, ultrasonic and other flaw detection technology, API 5CT oil casing is an important means to test the overall quality of API 5CT P110 Steel Oil Casing Pipe. The simple explanation is to fill the pipe with water and test its ability to maintain the prescribed pressure without leakage or rupture under confined condition. Its operation includes three steps: flushing, pressure testing and water control.

　　1. The hydrostatic test pressure of API 5CT oil casing is the low hydrostatic test pressure of flat end pipes, the high hydrostatic test pressure of coupling and the leakage resistance of internal pressure, but the standard high pressure is 69MPa, and the calculated pressure is generally rounded to close to 0.5 MPa.

　　2. According to API requirements, the hydrostatic test pressure measuring device should be calibrated within 4 months before each use.

　　3. If the demander has special requirements, higher hydraulic test pressure can be selected.

　　4. The leakage of hydrostatic test is the basis of rejection.

　　5. Unless otherwise agreed by the purchaser and the manufacturer, no hydrostatic test is required for the blank of API 5CT oil casing, the material of the coupling, the nearby material or the Q125 steel grade short joint.

　　6. If the actual hydrostatic test pressure can not meet the standard pressure due to equipment reasons, the technical departments should be informed in time to make corresponding process adjustment.

How to degaussing stainless steel cap by solid solution

　Stainless steel cap will be magnetic, service life will be reduced, how to deal with stainless steel cap demagnetization 304 stainless steel cap after thermal processing, not single-phase austenite, there are a small amount of carbide. In order to obtain single-phase austenite and improve corrosion resistance, all carbides are dissolved into austenite, and then quenched by water to room temperature, that is, to obtain single-phase austenite structure. This heat treatment is solid solution treatment, which can improve the corrosion resistance of materials and soften steel. Because of its special shape, if the cooling method is improper, it may lead to insufficient solid solution or serious shape deformation, which directly affects the product quality. Specification for heat treatment of solid solution treatment of stainless steel cap;

　　The operation method of solid solution treatment for 304 stainless steel cap; ASME B16.9 Stainless Steel A403 Wp304L Pipe Fitting Smls Cap hang the lifting ear with a traveling crane and immerse it in water for cooling.

　　Heads with large diameter and openable surface. The diameter of general holes should be more than 30 mm. In order to achieve better cooling effect, several more exhaust holes can be opened. After discharging from the furnace, the horizontal position of the lifting lug is immersed in water for cooling. For large diameter and non-perforated stainless steel cap, two exhaust pipes are welded, and a seamless steel pipe with a diameter of 80mm is used. After discharging from the furnace, the head of the exhaust pipe is immersed in water by crane, but the top of the exhaust pipe is always exposed to water.

Bend and elbow should keep the cross section of pipe

The stem of high-pressure large flange gate valve is heated, enlarged and bent in motion after conditioning and surface nitriding treatment. The manufacturing requirements of API 5L GR.B X70 5D Carbon Steel Pipe Fitting Bend are as follows: the bending radius of the small elbow processing type should not be less than twice the nominal diameter of the pipe; but after bending, the length of the pipe fitting bend should be cut off.

　　The transverse bars of fake and inferior elbows are thin and low, and the forming temperature of pipe fitting bend is generally controlled between them. The heat preservation materials without welded joints conforming to fire protection standards are all connected to the U-shaped pipe fitting bend with small volume of the fan-coil units of the water dish. The coil manufacturers introduce the lightweight drainage pipes and circuit devices for the body planning, and the length of the pipe fitting bend section is the bending radius. The thinner the wall thickness, the lower the input-output ratio will be accordingly.

　　The pipe fitting bend should keep the cross section of the pipe as it is, so as to avoid the pipe fitting bend failure. The service life chart of the pipe fitting bend describes the service life of the pipe fitting bend by continuously pumping water at different motor speeds at Celsius temperature and barium pressure.

What factors determine the service life of blind flange

There are many factors affecting the service life of blind flange. Because of the high viscous ANSI B16.5 Stainless Steel Forged FF Blind Flange material and poor chip breaking performance,blind flange is easy to scratch workpiece threads or tap edge collapse during tapping with taps in France, which affects the processing efficiency and thread quality. In order to prolong the service life of taps and improve the quality of thread processing,

　　In coil mill, the thermomechanical history of blind flange length changes obviously, especially in blind flange production, which will strongly affect the recrystallization degree, grain growth and precipitation on finishing mill, and lead to drastic changes in the ultimate microstructures and functions of blind flange length. When grinding, blind flange is necessary to keep the original geometric shape of the front guide part. Blind flange is better to use the tap shovel grinder for grinding. The best way to solve the problem of longer base surface of tap is to customize the tap with shorter base surface according to the specific requirements of the processed thread.

Increased competition between weld neck flange steel mills

In the unfavorable environment of slight profit or even loss in the whole weld neck flange industry, some small and medium-sized steel enterprises can develop vigorously. One of the secrets is that the burden is relatively light and the relative cost is relatively low. These steel enterprises occupy farmland and build blast furnaces at a low price, discharging untreated waste gases, wastewater and slag without restraint.

　　Destroying the environment, destroying good farmland and harming the health of the villagers around us, but they do not have to take responsibility for this. This is the secret that some small and medium-sized steel enterprises can make money under the background of the industry downturn, and is also the fundamental reason why China's production capacity is more and more limited. The emergence of oversupply in the A182 F304 Forged Stainless Steel Weld Neck Flange market makes the market have enough choice space.

　　The "seller" market gradually changes to the "buyer" market. Steel mills also step down from the altar. Competition among the weld neck flange steel mills intensifies. They have to start to approach the market demand actively and learn to produce according to the needs of customers. Weld neck flange can be said that it is because of overcapacity and oversupply that the market-oriented process of China's iron and steel industry has been accelerated. From striving to meet simple needs to providing more and more distinctive services to attract customers to weld neck flange needs, the market elimination rule that wins out gradually has been formed.

Why is the hardness of stainless steel socket flange low?

The data of low hardness and good toughness of stainless steel socket flange, such as low carbon steel and aluminium alloy, have low hardness and good toughness. Stainless steel socket flange is difficult to break chips during cutting, and it is easy to produce chip accumulating tumors, which affects the surface quality of processing.

　　Therefore, large rake angle, high speed cutting or large rake angle, low speed cutting and cutting fluid are often used to process Stainless Steel 300lbs Welding Sch80 Socket Flanges data. It can grind the chip breaking groove on the cutting tool and improve the grinding quality of cutting edge and knife face. In addition, for low carbon steel, normalizing treatment is stopped to refine grain size.

　　The data of high hardness and poor toughness of stainless steel socket flange, such as high carbon steel, carbon tool steel and cast iron, have high hardness and poor toughness. The cutting force produced during cutting is large, the power consumption is large, and the tool is easy to wear.

　　There are many kinds and specifications of stainless steel socket flange. In order to distinguish, use and manage conveniently, machine tools must be classified. Stainless steel socket flanges are mainly classified according to their processing properties and tool stops used.

Heat resistance of carbon steel slip on flange

1. High impact resistance: Because of En1092-B1 Carbon Steel Slip on Flange impact strength function, the ring stiffness is 1.3 times as much as that of other solid-wall tubes.

　　2. Long service life: Under rated operating temperature and pressure, the service life of carbon steel slip on flange is over 50 years, with anti-ultraviolet, anti-radiation, so that the product will never fade.

　　3. Good corrosion resistance: Except a few hydrogenating agents,carbon steel slip on flange can resist the corrosion of various chemical mediums. The carbon steel slip on flange has excellent acid resistance, alkali resistance, corrosion resistance, no rust, no corrosion, no bacteria, no electrochemical corrosion.

　　4. Good thermal insulation: PP-R pipe has good thermal insulation because of its low thermal conductivity, the thermal conductivity of 20 degrees Celsius is 0.21-0.24W/mk, which is much smaller than that of steel pipe (43-52W/mk) and purple steel pipe (333W/mk).

Atomization process of cut wire shot

Stainless steel cut wire shot is different from other similar products, so there are some obvious differences in the manufacturing process. One of them is called atomization method. The 0.3mm Stainless Steel Cut Wire Shot processed by atomization method are usually referred to as atomized stainless steel cut wire shot.

　　As for the detailed production process of atomized stainless steel cut wire shot, we can understand as follows: the first step is to heat the selected stainless steel material in a metal furnace so that it can gradually become a metal liquid in the process; the second step is to pour the metal liquid into the corresponding atomization equipment. Usually, atomizing equipment includes atomizing nozzle, which is the key component for manufacturing stainless steel cut wire shot.

　　The reason why the nozzle belongs to a more critical equipment is that some high-pressure and high-speed atomizing media will be ejected from the atomizing nozzle, which will have an important impact on the melted liquid metal and gradually disperse it into many small droplets. These droplets will condense into small metal particles in a short time during the process of dropping. If the particles are spherical, the required atomized stainless steel cut wire shot have been obtained.

Role of cast steel shot in rust removal treatment

　As a common material for metal surface treatment, cast steel shot is also in great demand in industry. Especially in the process of deoxidization and rust removal before coating, centrifugal shot blasting equipment is often used in this situation. The spherical shape and smaller hardness make the cast steel shot not cause greater wear and tear to the equipment. Cast Steel Shot S390 is also widely used in foundry industry. When the workpiece is removed from the mould, the sand on the workpiece surface is removed by cast steel shot.

　　Melt the high quality molten steel, then spray the molten steel with high pressure water spray gun to form cast steel shot.

　　The formed cast steel shot are reheated to homogenize, and then quenched. Quenched cast steel shot are dried and reheated in the furnace to achieve proper hardness. Products with different particle size and hardness are used in different processes, such as rust removal of steel, surface strengthening, etc. When adding new cast steel shot, please observe the principle of small amount of diligence.

　　The cast steel shot is made of scrap steel with selected raw materials, rare metals and optimum proportion alloys, melted in electric furnace, converted into cast steel shot by modern equipment, and after many times of electric heat treatment and automatic screening, its chemical composition and particle size are strictly controlled in the process of forming cast steel shot by liquid metals, so as to ensure its mechanical properties are in conformity with each other. For various purposes.

　　Each production link has the most rigorous quality management. The cast steel shot produced are tightly organized, not easy to break, uniform particle size distribution, with appropriate hardness, strong impact resistance and long service life.

　　The role of steel balls in deoxidizing scale and rust removal is very huge. Although it can be reused, its market is still very broad.

Hardness of cast steel grits and use of cast steel grits

Different cast steel grits have different hardness. Cast steel grits are made from high carbon steel shot by crushing into grit grains, and then tempering into three different hardness to adapt to different industries. The treated cast steel grits is screened into 10 grades according to SAE standard to meet the needs of sand blasting. Different sizes and hardness are used according to different situations.

　　Cast Steel Grit for Sandblasting is widely used in the pretreatment of steel workpiece before painting. Most of them are used in sand blasting houses with recycling equipment. The edge and corner shape of cast steel grits and its hardness determine that the cast steel grits can be cleaned up quickly and recovered efficiently at the same time. Cast steel grits is also used for sand cleaning of castings. Sometimes the casting sand will be embedded in the workpiece at high temperature, which exceeds the cleaning capacity of the steel shot. Then it is cast steel grits turn. When cast steel grits is newly manufactured, it is angular. In the process of use, the angular will be quickly rounded.

　　1. GP cast steel grits: When this kind of abrasive is newly made, it is sharp-edged, and the edges and corners are quickly rounded in the process of use. It is especially suitable for the pretreatment of removing oxide scale on the surface of steel.

　　2. GL cast steel grits: Although the hardness of this kind of cast steel grits is higher than that of GP cast steel grits, it still loses its edges and corners in the process of sand blasting, which is especially suitable for the pretreatment of removing oxide scale on steel surface.

　　3. GH scast steel grits: This kind of cast steel grits has a high hardness, and will always keep the edges and corners in the sand blasting operation. It is especially effective for forming regular and hairy surfaces.

How are cut wire shot produced?

First, scrap steel or raw material just need to detect its composition, and then add a certain proportion of alloy to melt in the furnace. Molten steel is produced by impact method, centrifugal method or atomization method. This process is also called pelletizing. After drying, the cut wire shot enter the vibrating screen. The cut wire shot are preliminarily classified into cut wire shot and steel sand. 。 After screening, the cut wire shot and steel grit are quenched again, and the tempering process is to make their hardness meet the standard requirements. Finally, further screening size and testing packaging.

　　The process of cut wire shot is the key point in the whole process. At present, the main methods are impact method, centrifugal method and atomization method.

Cast steel shots be reused?

The service life of cast steel shot is very long, because cast steel shot can be reused. At the same time, different types of cast steel shot have super long service life. The cost of using Cast Steel Shot for Shot Peening is very low, and it is very economical. Especially used in shot blasting and casting treatment, it is very useful.

　　How long is the service life of cast steel shot is the use of steel cut wire pellets, according to the different use of steel wire is divided into stainless steel shot and ordinary high-carbon steel shot and low-carbon steel shot.

　　Generally speaking, the Irving life of cast steel shot is 3000 - 3500 times, that is to say, it can be recycled so many times, in fact, there is no scrap standard, it will wear away slowly in the process of circulation, and become dust. It is very useful and can be used for surface treatment of almost any workpiece.

　　Because of its long service life, deeply loved by customers, the market is very good, and the consumption is also very large, especially in some shipyard enterprises. Generally speaking, the life of cast steel shot is 15-30% longer than that of cast steel shot, because cast steel shot has no pore and looseness, cast steel shot is mostly used for precision parts, and stainless steel shot is mostly used for stainless steel and aluminium castings, because it will not pollute the castings after shot blasting, and it is more wear-resistant. The high hardness cast steel shot is used to strengthen the blade, cylinder and connecting rod of aeroengine and diesel engine.

Advantages of cast steel grits

The cleanliness of metal surface treated by cast steel grits can reach international standards, and it has remarkable economic benefits for refining metal surface and strengthening metal structure. It is the most advanced and ideal material for cleaning, spraying, rust removal and strengthening at home and abroad. It has the characteristics of moderate hardness, strong toughness, impact resistance, continuous repeated use, long service life, good elasticity, strong adhesion, fast cleaning speed, G25 Cast Steel Grits From Reaguan consumption, no breakage, high brightness of cleaning workpiece, good technical effect, etc.

　　Many mechanical products want to have a good use effect, cast steel grit is necessary to carry out a series of treatment on the surface of equipment. There are many methods of metal surface treatment. At present, most of them are used. The best treatment effect is to use shot blasting machine to shot blasting and sandblasting metal.

　　At present, there are many kinds of abrasive products on the market, such as steel shot, cast steel grits, steel grit etc. Different abrasives are made from different raw materials. Cast steel grits products are one of the most effective abrasives.

　　Cast steel grit products have moderate hardness, strong toughness and impact resistance. They can be used repeatedly for several times. They have the characteristics of long service life, good elasticity, strong adhesion, fast cleaning speed, low sand consumption, no breakage, high brightness of cleaning workpiece and good technical effect. The products treated with cast steel grit can reach the national standard. It can be said that cast steel grit products are the most advanced and ideal material for cleaning, spraying, rust removal and strengthening at home and abroad.

Manufacturing technology of stainless steel cut wire shot

　Selection of Metal Material: stainless steel cut wire shot are made of stainless steel, of course, but there are two ways to prepare stainless steel:

　　The first is to use metal or alloy raw materials for preparation, because metal or alloy raw materials are usually purchased at a lower limit, so the cost of stainless steel cut wire shot made from purchased raw materials is relatively high.

　　The second is to select the waste of stainless steel for the production of stainless steel cut wire shot. Stainless steel scraps are found everywhere, with little problem and much lower cost than the raw materials prepared by the first method. In fact, Stainless Steel Cut Wire Shot From Reaguan are used to produce stainless steel metal powder. The profit of the manufacturer is the difference between the first method and the second method of raw materials and the value-added of products. If there is no difference in the price of raw materials, there will not be much profit only depending on the value-added of products.

Is the appearance of cast steel shot brighter and better quality?

The blacker the brighter the cast steel shot, the higher the temperature of heat treatment in the production process, resulting in the reduction of carbon content in the cast steel shot, so that the hardness of the S780 Cast Steel shots becomes lower, and the cast steel shot is prone to deformation in the process of hitting.

　　So the darker the appearance, the brighter the quality of cast steel shot is not good.

　　How effective is the recycled cast steel shot used?

　　Return pellet is a new kind of cast steel shot, but the source of return cast steel shot is uneven. It is recovered from alloy cast steel shot, steel wire cut shot and other kinds of cast steel shot after hit. So the composition is not uniform and the particle size is not uniform, which seriously affects the gloss and roughness of the workpiece after hit.

Why Cast Steel Grits Treats Workpiece Surface Slowly?

The main parameters affecting cast steel grits are abrasive type, abrasive particle size, abrasive concentration, injection distance, injection angle, injection time, compressed air pressure, etc.

　　The common process parameters of cast steel grits are the acceleration effect of compressed air on jet flow (P), the type of abrasive (S), the distance (H) of the gun and the angle (θ).

　　1. The Effect of Pressure Adjustment on Surface Result

　　After setting S, H and θ, the larger the P value, the higher the velocity of jet flow, the higher the G40 Cast Steel Grit From Reaguan efficiency, the rougher the surface of the workpiece, on the contrary, the smoother the surface is.

　　2. The influence of the distance and angle of the spray gun on the surface result

　　After setting P and S values, this is the key of manual sand blasting technology. The distance between the spray gun and the workpiece is generally 50-150 mm. The farther the spray gun is from the workpiece, the lower the efficiency of jet flow and the smoother the workpiece surface are. The smaller the angle between the gun and the workpiece is, the lower the efficiency of the jet flow and the smoother the workpiece surface is.

　　3. The influence of abrasive type on surface results. Abrasives are classified into spherical and diamond abrasives according to particle state. Diamond abrasives are usually used in cast steel grits. Glass beads are spherical abrasives.

　　After setting the P, H and θ values, the surface obtained by spherical abrasive blasting is smoother, while the surface obtained by rhombic abrasive is relatively rough, and the same kind of cast steel grits is divided into roughness and fineness. In China, according to the number of screen mesh, the roughness of abrasive is generally called number number. The higher the number of screen mesh, the smaller the particle size. After setting the P, H and theta values, the higher the number of the same abrasive blasting number, the obtained. The smoother the surface is.

Points for attention in recycling cast steel grits

　Cast steel grits can be reused, and proper recycling can reduce our cost rate. Cast steel grits are not only widely used but also reasonably priced, so they are loved by many manufacturers. It is used in all fields, but many manufacturers have used it once. Think that the cast steel grits has been damaged, no use value, when the garbage is thrown away, thus causing a great waste of resources, in fact, the used cast steel grits is still useful, the used cast steel grits after secondary treatment or can continue to use.

　　G40 Cast Steel Grit From Reaguan are contaminated by repeated recycling, and impurities will be mixed in the grits, which will affect the continued use of cast steel grits. At this time, cast steel grits need to be self-cleaning. The impurities in cast steel grits can be divided into solid impurities and soluble salts. Different treatment methods should be adopted for the two kinds of objects.

　　1. Solid impurities are cleaned up by clear air. In the recycling cycle, cast steel grits can be recovered by an automatic sand absorption separator, which can remove most of the bulk impurities and more than one third of the dust, and remove the solid impurities in the process of entering the sand storage bucket through the abrasive screening machine.

　　2. Soluble salts in cast steel grits can be removed by periodic water cleaning, and can be used alternately between cast steel grits for different purposes in recycling.

　　In order to recycle cast steel grits, we need to clean them to a certain extent. Only in this way can we make better use of cast steel grits.

The main reason of cut wire shot consumption

1. Adjustment of shot blasting machine and other equipment, different shot blasting angles, different degrees of consumption rate of shadow cut wire shot, the faster shot blasting speed, the greater consumption of ISO 9001 Cut Wire Shot, the failure of timely maintenance after damage of inner wall of shot blasting machine, the failure of timely extraction before shot blasting of mud core bone in inner cavity of bridge shell, the long shot blasting process, the failure of sealing at the top rail of shot blasting, the failure of timely recovery of scattered steel shot Utilization can affect the utilization efficiency of cut wire shot.

　　2. Surface roughness of cleaned materials. The higher the roughness, the greater the consumption of cut wire shot.

　　3. Sand sticking amount or rust grade of the surface of the workpiece to be treated.

　　4. The cleanliness level of the workpiece whose hardness is cleaned.

　　5. Requirements for the arc height of the strengthened work.

Relationship between hardness and service life of cast steel shots

　The higher the hardness of the cast steel shots, the faster the liquidation speed, but the shorter the service life, the larger the consumption. All the hardness is about HRC40-50, and the best application effect. The cast steel shots with moderate hardness and excellent anti elasticity can reach every center of the clearing room and reduce the disposal time.

　　1. The hardness is directly proportional to the cleaning speed. The higher the hardness is, the faster the cleaning speed is, the greater the consumption is, and the shorter the service life is. The manufacturing process determines the size of the cast steel shots. The larger the diameter is, the higher the surface roughness after cleaning is. However, the working efficiency is also very high, which is also larger than the wear.

　　2. Enough density to have stable quality, which can reduce fracture and wear during cleaning.

　　3. Internal defects such as porosity cracking and internal shrinkage can affect the life of the material and increase the consumption. The hardness is directly proportional to the cleaning speed, but inversely proportional to the service life. Therefore, the hardness is high, the cleaning speed is fast, but the life is Cast Steel Shots S280 and the consumption is large, so the hardness should be moderate to produce the most economic effect.

Why cast steel grits is slow in surface treatment of workpiece

　The main parameters affecting cast steel grits are abrasive type, abrasive particle size, abrasive concentration, spraying distance, spraying angle, spraying time, compressed air pressure, etc.

　　Three factors of surface result obtained by commonly used cast steel grits process parameters are as follows: acceleration effect of compressed air on jet flow (adjustment of cast steel grits pressure) P, type of abrasive (s), distance of spray gun (H), angle (θ).

　　1. Influence of pressure adjustment on surface results

　　After s, h and θ are set, the higher the p value is, the higher the velocity of the jet flow is, the higher the efficiency of sandblasting is, and the rougher the surface of the workpiece is. On the contrary, the surface is relatively smooth.

　　2. Influence of distance and angle of spray gun on surface result

　　After the P and s values are set, this is the key to the manual Cast Steel Grits G80 technology. The distance between the spray gun and the workpiece is generally 50-150 mm. The farther the spray gun is from the workpiece, the lower the efficiency of the jet flow and the smoother the workpiece surface. The smaller the angle between the spray gun and the workpiece, the lower the efficiency of the jet flow and the smoother the workpiece surface.

　　3. The influence of abrasive type on the surface result abrasive can be divided into two types according to the particle state: spherical abrasive and diamond abrasive. Diamond abrasive is usually used for cast steel grits. Glass beads are spherical abrasives.

　　After the P, h and θ values are set, the surface result obtained by ball abrasive blasting is relatively smooth, while the surface obtained by diamond abrasive is relatively rough, and the same abrasive is divided into thickness and fineness. In China, the thickness of abrasive is divided according to the number of screens, generally known as the number. The higher the number is, the smaller the particle size is. After the P, h and θ values are set, the higher the number of abrasive blasting of the same abrasive, the higher the obtained The smoother the surface results.

The formed cut wire shot is reheated to purify evenly

Cut wire shot is also widely used in the casting industry. When the workpiece is taken out of the mold, the cut wire shot on the surface of the workpiece is removed with cut wire shot. When the cut wire shot is used with suitable equipment, because it is durable, it must be the best abrasive for your surface cleaning.

　　The manufacturing process of 0.5 mm Cut Wire Shot is to melt the high-quality steel block first, then spray the molten steel with high-pressure water to form particles, reheat the formed cut wire shot to purify evenly, and then quench. After annealed, the surface color of tempered iron shot is uniform blue. Tempered iron shot is often used as cut wire shot. The service life of iron shot is only 50-400 times. The rust removal effect of cut wire shot is seriously reduced and the interests of users are seriously damaged.

　　Products with different particle size and hardness are used in different processes, such as surface strengthening. The cut wire shot can remove all the dirt on the surface of the work piece, such as the rust on the surface of the work piece. The cut wire shot can establish a very important basic schema on the surface of the work piece.

　　Moreover, the abrasive with different particle size can be exchanged to achieve different roughness and greatly improve the binding force between the work piece and the coating and the plating material. Cut wire shot is used for steel plate pretreatment, generally used for rust removal before coating.

How to prevent decarburization of thick-walled spiral steel pipe

　The service life of spiral steel pipe is positively related to the decarbonization of the surface of ApI 5L X42 Large Diameter Spiral Steel Custom Pipeline. If the surface decarbonization, the strength and wear resistance of spiral steel pipe will be reduced, which directly affects the service life of spiral steel pipe. If the decarbonization layer on the spiral steel pipe is not washed clean, the hardness and wear resistance of the surface layer of the spiral steel pipe will be correspondingly reduced, and in the process of quenching, cracks will be formed on the surface of the workpiece due to the volume change of the inner and outer layers.

　　In order to deal with the decarbonization problem on the surface, the heat treatment process is the main one, because decarbonization and oxidation of spiral steel pipe are carried out simultaneously. Therefore, in the heat treatment process, the spiral steel pipe and air should not be allowed to contact, so as to improve the decarbonization phenomenon.

　　Oxygen, water vapor and carbon dioxide are the main medium for decarburization on the surface of helical pipe. When these gases are in contact with the heated helical pipe, they will form oxidation and decarburization of helical pipe. Therefore, the proportion of carbon dioxide and carbon monoxide in the furnace is also very important.

　　It is also very useful to add protective gas nitrogen to the spiral steel pipe forging furnace. Nitrogen may disperse some oxidizing gas to reduce decarbonization of spiral steel pipe.

Characteristics of high pressure pipe fitting socket weld cap

　When pipe fitting socket weld cap and is not ready to extend now, ASME B16.11 Pipe Fitting Socket Weld Cap is welded to the pipe and used as an end. Used on pressure vessel, there is a cap on top and bottom, and a straight pipe section in the middle. It is used as a tank of pressure vessel. The ratio of the long axis to the short axis of the rotary elliptical spherical busbar is 2.0.

　　The mechanical properties of pipe fitting socket weld cap are second only to hemispheric head, but better than dish head. Because the depth of high pressure pipe fitting socket weld cap is between hemispherical and dish-shaped head, the requirement of stamping equipment and die, and the difficulty of manufacturing, high pressure pipe fitting socket weld cap is easier than hemispherical head and more difficult than dish head.

　　Regardless of the location of the defect and the material quality of the product being inspected, strict requirements shall be followed to ensure that. In recent years, non-destructive testing academic research is very active, but people are keen to improve the detection level, new equipment, improve means, improve detection sensitivity. Welding inspection is a kind of control means, so people pay more attention to its supervisory function. Considering factors, there is no strict distinction between high pressure pipe fitting socket weld cap and dish cap. Or it is directly Frank that approximate high pressure pipe fitting socket weld cap can be equivalent to replace 2:1 high pressure pipe fitting socket weld cap.

　　There is a common basis: no matter what forming principle and processing method are used to make it. As long as the final internal sample inspection results are within the allowable deviation range of 2:1 high pressure pipe fitting socket weld cap stipulated in GB150-1998 standard, the formed cap belongs to 2:1 high pressure pipe fitting socket weld cap without increasing wall thickness. It can be seen that the allowable deviation occupies an important position in the theory of equivalent substitution. In recent years, the spinning process has brought convenience to the manufacture of large diameter and high pressure pipe fitting socket weld cap. High pressure pipe fitting socket weld cap is widely used in medium and low pressure vessels because of its good comprehensive performance.

Cautions in use of pipe fitting bend

There are many pipe fitting bend used in the bending part of the pipeline, and the direction of the pipeline can be changed by using the pipe fitting bend. There are many kinds of Stainless Steel 90 Degree 10D 304L Large-Caliber Pipe Fitting Bend, such as 45 degree pipe fitting bend and 90 degree pipe fitting bend. The bending radius is about 1.0 times of the outside diameter of the tube, which is called short radius pipe fitting bend, and 1.5 times of the outside diameter of the tube, which is called long radius pipe fitting bend. In the pipeline system layout, it is generally appropriate to use long radius pipe fitting bend connection, short radius pipe fitting bend is usually used in the pipeline installation location is more compact occasions or in order to reduce costs.

　　When using short radius pipe fitting bend, the maximum working pressure should not exceed 0.8 times of long radius pipe fitting bend of the same specification. Oblique pipe fitting bends are usually used in large-sized pipes with low pressure, water and similar fluid medium conditions. When the angle of the single section variable direction of the oblique pipe fitting bend is greater than 45, it is better not to be used in poisonous and flammable medium pipelines, or in pipelines subject to vibration, pressure fluctuation and alternating load due to temperature change.

Properties and carbon content of carbon steel elbows

The higher the carbon content, the higher the hardness and strength, but the lower the plasticity. First, the mechanical properties depend on the carbon content in the steel, which usually does not increase a lot of alloy elements, sometimes referred to as plain carbon steel or carbon steel. Carbon steel, also known as carbon steel, refers to iron-carbon alloys with carbon content less than 2%.

　　Carbon steel can be divided into three types according to its use: carbon structural steel, carbon tool steel and free cutting structural steel. Carbon structural steel can be divided into construction structural steel and machine-made structural steel. According to carbon content, carbon steel can be divided into low carbon steel (C < 0.25%), medium carbon steel (C 0.25% - 0.6%) and high carbon steel (C > 0.6%). According to the mixture of phosphorus and sulphur, carbon steel can be divided into ordinary carbon steel (high phosphorus and sulphur content), high quality carbon steel (low phosphorus and sulphur content) and high quality steel (low phosphorus and sulphur content) usually the higher carbon content, the harder carbon steel is. The higher the strength, the higher the plasticity.

　　The use of ASTM A234 Wpb Special Carbon Steel 90 Long Redius Elbow and device use: carbon steel elbow is used for the connection of pipeline bend. Connect two pipes with the same nominal diameter to make the pipeline turn as the viewpoint. Carbon steel elbow can be said to cover the use of all walks of life throughout the country, from small families to large companies. Each carbon steel elbow has its own interests and uses.

Significant volume of sales in welded steel custom pipeline market

The surge of snails resulted in a significant volume of spot welded steel custom pipeline market transactions. The high settlement price of BS1387 Carbon Welded Steel Custom Pipeline and the price policy of not making up the difference showed a strong willingness to bid. Most other businesses had completed sales volume, so the price went up in an all-round way.

　　At present, external favorable factors dominate, downstream demand release is limited, and the trading performance of welded steel custom pipeline market is general.At the beginning of the month, the pressure of business resources slowed down, and the market's willingness to buy goods at low prices weakened.The short-term trend of billet and snail is uncertain, which has great influence on market price. Considering the above, in the off-season, the market price is still lower, but in the short term, if the billet is boosted, it may still be higher.

　　It is anticipated that the main reason for the stable operation of the welded steel custom pipeline market next week is that the market will enter the off-season and the demand is general. However, the trend of the steel billet snails can boost the mindset of the spot merchants. The market atmosphere is strong and the quotation will follow the market. In addition, at the beginning of next week, the financial pressure of the welded steel custom pipeline market will be slightly slower and the overall trend will remain stable.

Parts of stainless steel pipe fittings out of stock

Recent environmental impact on the whole stainless steel pipe fittings market in Mengcun Yanshan, China, all types of stainless steel pipe fittings of all materials have risen by 10%-15% in a week.

　　This month's increase is even more alarming. In the 30-40% stainless steel pipe fittings market, some products have been out of stock. Today, 150lbs Threaded Stainless Steel Pipe Fittings High Press Cross of all large enterprises almost out of stock. Even the packing case has risen by 20% at a time. The original price of the wooden case of 1 meter x 1 meter is 100 and the present price is 120. Here, we remind our customers not to hesitate about the price. It is no longer a question whether they can buy high-quality products or not. In order not to affect your use, please contact us to place the order as soon as possible.

Large-caliber flange is widely used

As a sealing and fastening connector, large-caliber flange are easy to install, flexible in position and long in service life. They are widely used in large containers in aerospace, petroleum, chemical and other fields.

　　The weld of 304 Stainless Steel Socket Large-Caliber Flange should be inspected by 100% ultrasonography or radiography. There should be no cracks on the surface of large-caliber flange or other large-caliber flange connection or strength reduction defects. When the working pressure of large-caliber flange with long diameter is equal to or greater than the maximum allowable working pressure specified in the standard of 0.8 times, the butt weld of large-caliber flange and circular pipe should be inspected by 100% X-ray photograph. This method of inspection should be implemented in accordance with the provisions of JB4730. Ultrasound inspection of large-caliber flange shows that is a qualified product and it is required for radiation. If the pressure vessel pattern where the large-caliber flange is located fails to meet the above requirements for the inspection of the vessel shell, it should be carried out according to the contract or the label in the pattern.

　　Large-caliber flange can be used in different ways, which has special meaning and significance in industry and plays an important role and value in the mechanical industry.

Common faults of large-caliber flange

In the continuous production of modern industry, large-caliber flange will inevitably leak due to the influence of medium corrosion, erosion, temperature, pressure, vibration and other factors. The leakage of large-caliber flange is easily caused by the errors in the dimension of sealing surface, aging of sealing elements and improper installation and fastening.

　　If the 304 Stainless Steel Socket Large-Caliber Flange leakage problem can not be treated in time, the leakage will expand rapidly under the erosion of the medium, resulting in material loss, production environment damage, leading to shutdown of enterprises, resulting in huge economic losses. If it is toxic, harmful, flammable and explosive medium leakage, it may also cause personnel poisoning, fire and explosion and other major accidents.

　　The traditional methods to solve large-caliber flange leakage are replacing sealing elements, smearing sealant or replacing large-caliber flange and pipes. However, this method has great limitations, and some of the leakage is limited by the requirements of working environment safety, so it can not be solved on site. It is an ideal method, especially in flammable and explosive occasions, which shows its unique advantages.

　　Polymer composite technology construction process is simple, safe, and low cost, can solve most of the problems of large-caliber flange leakage for enterprises, eliminate potential safety hazards, and save more maintenance costs for enterprises.

What factors determine the service life of large blind flange

Due to the high viscosity and poor chip breaking performance of large blind flange material, it is easy to have chip scratch on the workpiece thread or screw tap chipping in the tapping process of ANSI B16.5 stainless steel Special Pipeline Blind flange, which affects the processing efficiency and thread quality. In order to prolong the service life of tap and improve the quality of thread processing,

　　On the steckel mill, the thermomechanical history of the whole length of the large blind flange changes obviously, especially in the production of the micro large blind flange, which will strongly affect the recrystallization degree, grain growth and precipitation on the finishing mill, and lead to the drastic change of the ultimate microstructure and function of the whole length of the large blind flange. The original geometric shape of the leading part must be maintained during grinding. It is better to use a tap spade grinding machine for grinding. The best way to solve the problem is to customize the tap with shorter base according to the specific requirements of the thread to be machined.

　　Large blind flange taps should be made of better taps. The wear resistance and toughness of tap can be significantly improved by adding special alloy elements to common high speed tool steel. The heat treatment method of cutting tool should be selected reasonably to take into account the hardness and toughness of tap. Increase the front angle of tap properly. However, it should be noted that if the front angle of the tap is too large, it is easy to cause the tap to break the edge and the tapped thread to have multiple edges when withdrawing the cutter. The wear resistance, heat resistance and lubricity of tap can be improved by coating titanium nitride on the surface of tap.

Grade of oil casing custom pipeline

The oil casing custom pipeline is mainly used for the drilling of oil and gas wells and the transportation of oil and gas. It includes oil drilling pipe, oil casing custom pipeline and oil extraction pipe. Oil casing custom pipeline is mainly used to connect drill collar and bit and transfer drilling power. Petroleum casing is mainly used to support the well wall in the process of drilling and after completion, so as to ensure the normal operation of the whole oil well in the process of drilling and after completion. The oil and gas at the bottom of the oil casing custom pipeline are mainly transported to the surface by the pumping tubing.

　　API 5L X42 N80 Seamless Steel Oil Casing Custom pipeline is the lifeline to maintain oil well operation. Due to different geological conditions, the downhole stress state is complex, and the comprehensive action of tensile, compressive, bending and torsional stresses acts on the pipe body, which puts forward higher requirements for the quality of the casing itself. Once the casing itself is damaged for some reason, the production of the whole well may be reduced or even discarded.

　　According to the strength of the steel itself, the oil casing custom pipeline can be divided into different steel grades, namely J55, K55, N80, L80, C90, T95, P110, q125, V150, etc. Different well conditions and well depths lead to different steel grades. In corrosive environment, the casing itself is also required to have corrosion resistance. In the complex geological conditions, casing is also required to have collapse resistance.

Sealing performance of thread screw hex nipple

The sealing performance of the thread screw hex nipple refers to the ability of each sealing part of the thread screw hex nipple to prevent medium leakage, which is the most important technical performance index of the thread screw hex nipple.

　　There are three sealing parts of the 1/2" Stainless Steel Pipe Fitting Thread Screw Hex Nipple: the contact between the two sealing surfaces of the opening and closing parts and the thread screw hex nipple seat; the fitting between the packing and the thread screw hex nipple stem and the packing box; and the connection between the thread screw hex nipple body and the thread screw hex nipple cover. The former leakage is called internal leakage, that is to say, the thread screw hex nipple is not tightly closed, which will affect the ability of the thread screw hex nipple to cut off the medium. For block valves, internal leakage is not allowed.

　　The last two leaks are called leakage, that is, the medium leaks from the inside to the outside of the thread screw hex nipple. Leakage will cause material loss, environmental pollution and even accidents. For flammable, explosive, toxic or radioactive media, leakage is not allowed, so the valve must have reliable sealing performance.

Introduction to the function of concentric reducer

Concentric reducer is a kind of  pipe fitting. If the selected diameter specification of ASME B16.9 A234WPB Large-Caliber Carbon Steel Concentric Reducer is not consistent with the inner diameter of process pipe, corresponding reducing or expanding treatment shall be carried out. If the pipe is shrunk, whether the pressure loss caused by this will affect the process flow shall be considered. In order to prevent the influence of the installation of concentric reducer on the distribution of flow field, resulting in the loss of pressure, thus reducing the measurement accuracy of electromagnetic flowmeter The required center angle is no more than 15 °, the smaller the better. There are two types: concentric and eccentric. The concentric reducer is generally used on the vertical pipe; the eccentric reducer is used on the horizontal pipe, and it should be noted whether the top is flat or the bottom is flat

　　There are mainly the following places:

　　1. When the flow rate of the fluid in the pipeline changes, such as increasing or decreasing, and the flow rate requirement changes little, reducer shall be used

　　2. The inlet of the pump is to prevent cavitation

　　3. In order to cooperate with the joint of instrument, such as flowmeter and regulating valve, reducer shall also be used

Increased competition between weld neck flange steel mills

In the unfavorable environment of slight profit or even loss in the whole weld neck flange industry, some small and medium-sized steel enterprises can develop vigorously. One of the secrets is that the burden is relatively light and the relative cost is relatively low. These steel enterprises occupy farmland and build blast furnaces at a low price, discharging untreated waste gases, wastewater and slag without restraint.

　　Destroying the environment, destroying good farmland and harming the health of the villagers around us, but they do not have to take responsibility for this. This is the secret that some small and medium-sized steel enterprises can make money under the background of the industry downturn, and is also the fundamental reason why China's production capacity is more and more limited. The emergence of oversupply in the A182 F304 Forged Stainless Steel Weld Neck Flange market makes the market have enough choice space.

　　The "seller" market gradually changes to the "buyer" market. Steel mills also step down from the altar. Competition among the weld neck flange steel mills intensifies. They have to start to approach the market demand actively and learn to produce according to the needs of customers. Weld neck flange can be said that it is because of overcapacity and oversupply that the market-oriented process of China's iron and steel industry has been accelerated. From striving to meet simple needs to providing more and more distinctive services to attract customers to weld neck flange needs, the market elimination rule that wins out gradually has been formed.

Why is the hardness of stainless steel socket flange low?

The data of low hardness and good toughness of stainless steel socket flange, such as low carbon steel and aluminium alloy, have low hardness and good toughness. Stainless steel socket flange is difficult to break chips during cutting, and it is easy to produce chip accumulating tumors, which affects the surface quality of processing.

　　Therefore, large rake angle, high speed cutting or large rake angle, low speed cutting and cutting fluid are often used to process Stainless Steel 300lbs Welding Sch80 Socket Flanges data. It can grind the chip breaking groove on the cutting tool and improve the grinding quality of cutting edge and knife face. In addition, for low carbon steel, normalizing treatment is stopped to refine grain size.

　　The data of high hardness and poor toughness of stainless steel socket flange, such as high carbon steel, carbon tool steel and cast iron, have high hardness and poor toughness. The cutting force produced during cutting is large, the power consumption is large, and the tool is easy to wear.

　　There are many kinds and specifications of stainless steel socket flange. In order to distinguish, use and manage conveniently, machine tools must be classified. Stainless steel socket flanges are mainly classified according to their processing properties and tool stops used.

Heat resistance of carbon steel slip on flange

1. High impact resistance: Because of En1092-B1 Carbon Steel Slip on Flange impact strength function, the ring stiffness is 1.3 times as much as that of other solid-wall tubes.

　　2. Long service life: Under rated operating temperature and pressure, the service life of carbon steel slip on flange is over 50 years, with anti-ultraviolet, anti-radiation, so that the product will never fade.

　　3. Good corrosion resistance: Except a few hydrogenating agents,carbon steel slip on flange can resist the corrosion of various chemical mediums. The carbon steel slip on flange has excellent acid resistance, alkali resistance, corrosion resistance, no rust, no corrosion, no bacteria, no electrochemical corrosion.

　　4. Good thermal insulation: PP-R pipe has good thermal insulation because of its low thermal conductivity, the thermal conductivity of 20 degrees Celsius is 0.21-0.24W/mk, which is much smaller than that of steel pipe (43-52W/mk) and purple steel pipe (333W/mk).

Market analysis of threaded flange

　Recently, the price of threaded flanges is very low. Some steel mills and material yards intend to leave the market on holiday. The price of threaded flanges is intentionally and crazily depressed. The market in East China has fallen so badly. At present, the price of threaded flanges has fallen by about 30 percent, and the actual price of some factories that have not yet fallen outside has already been lowered by about 50 percent. Nowadays, the behavior of bull bears is becoming more and more active.

　　On the market of threaded flanges, except for a short rise at the opening of last night's trading, the whole day showed a narrow cross-section trend, the average price slightly declined, the market carrying capacity gradually weakened, and the fluctuation of the last market began to decline and unified, and closed at a sub-low point. Unlike the previous days, the whole day of the day showed a continuous increase in warehouses, but the overall extent was not large, and the concentrated decline of the tail was achieved by reducing warehouses. A182 F316/316L Stainless Steel Threaded Flange seems that short-selling is still more cautious, mainly with tentative guidance, and continued development is not conducive to bulls.

　　In the peripheral market, the price adjustment was weak, ranging from 10 yuan, with large household shipments of 200-1000 tons. At present, the price of construction steel in Beijing has fallen to the lowest level in the whole country, and the market transaction price is approaching the 2200 yuan/ton mark. Some businessmen also say that the market is more transparent and the phenomenon of follow-up drop is more common. A sharp reduction in the price will only lower the overall level, and will not have price advantages.

　　However, the downstream demand is not good, and the steel mill price limit is pressing step by step. Considering the difficulty of high-price shipment, businessmen are facing difficulties. Bidding is in a dilemma, even the winter reserve goods have to stay on the sidelines because of the market downturn. Spot, the domestic power coal market is running smoothly, and the threaded flanges turnover is very low. As for pithead, the inadequate start-up rate of several major coal-producing areas, together with a series of production restriction measures introduced by some major coal-producing provinces, will lead to a certain reduction in production, which will also have a certain impact on the market.