How to improve the welding speed of spiral steel pipe?

In order to obtain good surface quality pipe, spiral steel pipe is also necessary to fully cool the spiral steel pipe. Cooling method may choose to spray cooling liquid on the side of extrusion roll or through the central through hole of extrusion shaft for cooling. When Q235 Hot Rolled Welded 28 Inch Spiral Steel Pipe is welded at high speed, internal and external cooling method can be chosen.

　　For the large number of diameter and wall thickness, a simple sliding slit guide piece may as well meet the requirements. For large diameter and thick pipe wall, the guide roll with rotating slot is usually chosen. Both types may supplement the vertical rollers and provide special control for the rebound of the service clothes.

　　Otherwise, part of the high-frequency sensory current of the thick-walled spiral steel pipe will flow along the wrong path upward along the slit guide rather than downward along the V-shaped surface.

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.

Classification of Carbon Steel Elbows

In addition to carbon, carbon steel elbows generally contain a small amount of silicon, manganese, sulphur and phosphorus. According to their uses, carbon steel can be divided into three categories: carbon structural steel, carbon tool steel and free-cutting structural steel. Carbon structural steel can also be divided into building structural steel and machine-made structural steel.

　　ANSI B16.9 Sch40 A234 Wpb Bw Pipe Fitting CS Elbow can be divided into open-hearth steel, converter steel and electric furnace steel according to smelting method; boiling steel, killed steel, semi-killed steel and special killed steel according to deoxidization method; carbon steel can be divided into low-carbon steel, medium-carbon steel and high-carbon steel according to carbon content; carbon steel can be divided into ordinary carbon steel, high-quality carbon steel and high-quality steel according to phosphorus and sulfur content.

　　Generally, the higher the carbon content in carbon steel, the higher the hardness and strength, but the lower the plasticity. Mainly refers to the mechanical properties depend on the carbon content in the steel, and generally do not add a large number of alloy elements in the steel, sometimes also known 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%.

How to improve the circulation of carbon steel tee?

Phosphorus makes the eutectic point of pig iron move to the left, which can dissolve liquid pig iron and reduce the solubility of carbon in liquid pig iron. But in solid pig iron, the solubility of carbon in solid pig iron is limited, and with the increase of carbon moisture content and the decrease of temperature, it decreases. It does little harm to graphitization, decreases the strength and ductility of carbon steel tees, and improves their strength.A234 Wpb Carbon Steel Seamless Pipe Fitting Equal Tee also improves the fluidity and castability of carbon steel tees, but increases the shrinkage, casting defects and cracking tendency of carbon steel tee.

　　For steel castings, the quality performance of phosphorus is less than 3.0%. Phosphorus in nodular cast iron does not harm spheroidization, but it can melt in molten iron to reduce the eutectic carbon content of iron, carbon and manganese steel, so it is harmful to the original elements. Copper makes the mechanism high density, and decomposes and improves the uniform distribution of graphite, which can not only reduce the white tendency of pig iron, but also reduce the critical temperature of austenite change, decompose and enhance ferrite, which is beneficial to cross-section sensitivity.

Heat treatment technology of carbon steel eccentric reducer

In the process of carbon steel eccentric reducer and pressing, cold pressing or hot pressing is adopted according to the different materials and changing ASTM A234wpb Seamless Carbon Steel Eccentric Reducer. Usually, cold pressing is adopted as far as possible, but in the case of severe hardening caused by multiple changing diameter, hot pressing is preferred for the case of thick wall or alloy steel material. Diameter enlargement forming of billet inner diameter. Diameter enlargement technology mainly solves the problem that the carbon steel eccentric reducer is not easy to be formed by diameter reduction. Sometimes, according to the forming requirements of materials and products, the methods of diameter enlargement and diameter reduction are combined.
　　Hot-pressed tees have wide adaptability to materials and are suitable for materials of low carbon steel, alloy steel and stainless steel. Especially for tees with large diameter and thick pipe wall, this forming process is usually adopted. Besides using steel pipe as raw material to produce carbon steel eccentric reducer, steel sheets can also be used to stamp large and small heads of Department specifications. The die used for drawing is designed according to the dimension of inner surface of carbon steel eccentric reducer, and the steel plate after cutting is stamped and stretched by the die.