How to harden seamless steel pipes

 The hardness of seamless steel pipes is usually determined based on the type of steel used and the heat treatment method. The following are some methods that may harden seamless steel pipes:

　　Heat treatment: By heating and cooling seamless steel pipes, their hardness can be enhanced. There are various heat treatment methods to choose from, such as normalizing, quenching, quenching, tempering, and so on.

　　Work hardening: Mechanical and deformation processes, such as rolling or stretching, can change the crystal structure of steel and enhance its hardness.

　　Adding alloy elements: Adding other metal materials to steel, such as titanium, chromium, nickel, can increase the hardness of seamless steel pipes.

　　It should be noted that heat treatment and work hardening may lead to increased brittleness of seamless steel pipes, so the correct method must be selected. It is recommended that you consult a professional to ensure proper operation before performing any processing.

The main features and advantages of Q345B seamless steel pipe include

 Excellent corrosion resistance: Q345B seamless steel pipe uses suitable alloy additives, which has excellent corrosion resistance, especially in corrosive media such as acid and alkali.

　　High strength: The tensile strength of Q345B steel is as high as 490MPa or more, and the strength of Q345B seamless steel pipe is also very high, which can be used in high-strength industrial fields.

　　Good plasticity: Q345B seamless steel pipe has good plasticity and toughness during processing, and can maintain its integrity in a diverse environment.

　　Smooth surface: Q345B seamless steel pipe has a smooth surface, without obvious burrs, and is generally not prone to heat transfer problems, which can ensure the quality of liquid or gas transportation.

　　Wide application range: Q345B seamless steel pipe is widely used in various fields, such as petrochemical, mining, construction, automobile, machinery manufacturing, and so on.

　　Q345B seamless steel pipe is also widely used in various fields. For example, it can be used in the petrochemical industry to transport chemical liquids, oil, and natural gas, as well as for processing equipment and pipeline systems. In the automotive, construction, and mechanical industries, Q345B seamless steel pipes are commonly used to produce various high-strength components, including bearings, machine structures, and transmission shafts. In summary, due to its various advantages, Q345B seamless steel pipe has found a large number of uses and applications in both industrial and civil fields.

Large-diameter big thickness Grade 20# seamless steel pipe

 Difference in allowable stress of large diameter thick wall 20 # seamless steel pipe at temperatures of 100 ℃ and 225 ℃

　　Allowable stress of No. 20 steel: allowable stress of No. 20 steel at 225 ℃: (16-36 mm) between 111-124 MPa; 117-131MPa between (6-16mm)

　　Allowable stress of 20 # steel at 100 ℃: At 150 ℃, the allowable stress of 20 # steel pipe is 130 MPa, and the allowable stress of 20 # steel forgings is 108 MPa

　　Seamless steel pipes are widely used. General purpose seamless steel pipes are rolled from ordinary carbon (C) plain structural steel, low alloy structural steel, or alloy structural steel, with the largest production, and are mainly used as pipes or structural parts for conveying fluids. 2. Supply is divided into three categories according to different uses:

　　A. Supplied according to chemical composition and mechanical performance;

　　B. Supply according to mechanical performance;

　　C. Supply according to hydraulic test. GB9948 seamless steel pipes are mainly used for the production of pneumatic or hydraulic components, such as air cylinders or oil cylinders, all of which are made of seamless pipes. The chemical components of precision seamless steel pipes include carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, and chromium Cr. GB5310 seamless steel pipes are divided into seamless steel pipes for structural purposes; Seamless steel pipe for conveying; Seamless steel tubes for boilers; High pressure seamless steel pipes for boilers. Seamless steel pipes are divided into circular and special-shaped pipes according to their cross-sectional shapes. The special-shaped pipes have various complex shapes, such as square, elliptical, triangular, hexagonal, melon seed, star, and finned pipes. Press

　　For steel pipes supplied in categories A and B, if they are used to withstand liquid pressure, they also need to undergo a hydraulic pressure test. 3. There are various types of seamless pipes for special purposes, such as seamless pipes for boilers, chemical and electric power, geological seamless steel pipes, and petroleum seamless pipes. Seamless steel pipes have hollow (zh ō ng k ō Ng) Cross section, widely used as a conduit for transporting fluids, such as oil, natural gas, coal gas, water, and some solid materials. Compared with solid steel such as round steel, steel pipes have a lower weight when their bending and torsional strength are the same, making them an economic cross-section steel. Extensively used for manufacturing structural and mechanical parts, such as petroleum drill pipes, automotive transmission shafts (composed of shaft tubes, expansion sleeves, and universal joints), bicycle frames, and steel scaffolds used in architectural construction. The use of steel pipes to manufacture circular parts can improve material availability, simplify manufacturing processes, and save materials and processing hours, Steel pipes have been widely used for manufacturing.

Specifications of steel grit

 Specifications of steel grit

Products		Steel Grit
Chemical Composition	C	0.70~1.20%
	Mn	0.35~1.20%
	Si	≥0.40
	S	≤0.05%
	P	≤0.05%
Microhardness		Normal:40~50HRC (377~509HV)
		Special:52~56HRC (543~620HV)
		Special:56~60HRC (620~713HV)
Hardness Deviation		Max Deviation ±3.0HRC
Microstructure		Tempered Martensite or Sorbite
Density		7.2g/cm3

What is the effect of shot peening on the material surface?

 　Shot peening is a process that impinges on the workpiece surface by using sand and iron shot sprayed at high speed to improve the mechanical properties of parts and change the surface state. It can be used to improve the mechanical strength of parts, wear resistance, fatigue resistance and corrosion resistance, and can also be used for surface extinction, skin removal and optimization of casting, forging, welding residual stress.

　　Shot peening process is the process of spraying a large number of projectiles to the surface of the parts, like countless small hammer hammer on the surface, therefore, the surface of metal parts produce very strong plastic deformation, the surface of the parts produce a certain thickness of cold hardening layer, known as the surface strengthening layer, the strengthening layer will significantly improve the fatigue strength of parts.

The role of steel shot in the surface treatment of steel pipe

 With the development of economy, the steel pipe is widely used in the transportation industry of various chemical substances. The surface treatment of steel pipe is one of the key factors to determine the service life of the transportation pipe. In addition to coating type, coating quality and construction environment, the surface treatment of steel pipe also has a great influence on the life of anticorrosive layer. This is the steel shot, steel grit will come in handy.

　　Spray derusting is driven by high power motor jet blade high-speed rotation, so that abrasive sand, steel ball under the action of centrifugal force on the surface of the steel pipe spraying (throwing) treatment, so that not only can completely remove rust, oxides and dirt, but also under the action of abrasive fierce impact and friction force, steel pipe can also achieve the required uniform roughness. The mechanical adhesion between the anticorrosive layer and the surface of the pipe is enhanced not only by enlarging the physical adsorption on the surface of the steel pipe but also by spraying the steel pipe. Jetting is an ideal way to remove rust in pipeline. Shot blasting (sand) rust removal is mainly used for pipe inner surface treatment, shot blasting (sand) rust removal is mainly used for pipe outer surface treatment. Several problems should be paid attention to when using spray to remove rust.

　　Abrasives can be selected according to the hardness of the surface of the steel pipe, the original degree of rust, the required surface roughness, the coating type, etc. The mixture of steel sand and steel pellets is easier to achieve the ideal effect of rust removal. Steel shot can strengthen the steel surface, and steel sand can etch the steel surface. The abrasive mixture of steel sand and steel shot, usually the hardness of steel shot is 40 ~ 50HRC, the hardness of steel sand is 50 ~ 60HRC can be used for all kinds of steel surface, even if it is used in C and D grade rust steel surface, the rust removal effect is also very good.

　　The surface treatment of the steel pipe seriously affects the service life of the pipe, is also the most simple and direct treatment method, so we should strictly comply with the requirements of the anticorrosive layer specification on the surface of the steel pipe, and constantly explore, summarize and improve the surface treatment method of the steel pipe.

300 tons of Stainless Steel Pipes Shipped to Turkey

 300 tons of Stainless Steel Pipes Shipped to Turkey

　　Purchase date: December 17, 2022

　　Delivery date: January 27, 2023

　　Name of purchased product: Hot Rolled ASTM Stainless Steel Pipe

　　Quantity: 300 tons

　　Mode of transportation: sea transportation

　　Port of destination: DILISKELESI