Alloy steel pipe material use and material Description: Seamless steel pipe with hollow section, a large number of pipes used for conveying fluid, such as the transmission of oil, natural gas, gas, water and some solid materials such as pipeline.

Seamless steel pipe and round steel and other solid steel compared to the same flexural torsional strength, the lighter weight, seamless steel pipe is an economic section of steel, widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, Car drive shaft, bicycle frame and the construction of steel scaffold and so on. With 27SiMn seamless steel pipe manufacturing ring parts, Alloy Steel Pipe and Tube can improve the utilization of materials, simplify the manufacturing process, saving materials and processing time, such as rolling bearing rings, jack sets, etc., has been widely used to manufacture steel. 27SiMn seamless steel pipe or a variety of conventional weapons indispensable materials, barrels, barrels and so on to steel to manufacture. 2 seamless steel pipe by cross-sectional shape of the different shapes can be divided into tube and shaped tube. As the circumference of the same conditions, the largest circular area, with a circular tube can transport more fluid. In addition, the ring cross section in the internal or external radial pressure, the force is more uniform, Alloy Steel Pipe and Tube so the vast majority of steel pipe is a tube.

Alloy steel pipe standard

4.1, specifications: hot-rolled tube diameter 32 ~ 630mm. Wall thickness of 2.5 ~ 75mm. Cold rolled (cold drawn) pipe diameter 5 ~ 200mm. Wall thickness of 2.5 ~ 12mm.

4.2, the appearance of quality: steel pipe inside and outside the surface shall not have cracks, folding, rolling off, from the layer, hairline and scarring defects exist. These defects should be completely removed, after removal of the wall thickness and diameter should not exceed the negative deviation.

4.3, both ends of the pipe should be cut at right angles, Alloy Steel Pipe and Tube and remove the burr. Thickness greater than 20mm steel pipe to allow gas cutting and hot saw cutting. The agreement between the supply and demand sides may not be cut.

4.4, cold drawn or cold rolled precision P91 alloy tube "surface quality" with reference to GB3639-83.

5, chemical composition test

5.1, chemical composition and mechanical properties of domestic P91 alloy pipe, such as 10,15,20,25,30,35,40,45 and 50 steel chemical composition should be consistent with the provisions of GB / T699-88. Imported P91 alloy pipe according to the relevant provisions of the contract inspection. 09MnV, 16Mn, 15MnV steel chemical composition should be consistent with the provisions of GB1591-79.

5.2, the specific analysis method with reference to GB223-84 "steel and alloy chemical analysis method" of the relevant part.

5.3, analysis of the deviation with reference to GB222-84 "steel chemical analysis of samples and finished chemical composition of the allowable deviation."

Alloy steel pipe welding process

In order to increase the argon protection zone and enhance the protection effect, can use large diameter torch porcelain mouth, Alloy Steel Pipe and Tube increase the argon gas flow. When there is a splash on the nozzle that clearly obstructs the flow of argon gas. The spatter must be removed or replaced by the nozzle. When the extreme end of the tungsten pollution, irregular shape and other phenomena must be trimmed or replaced. Tungsten should not extend out of the nozzle. The welding temperature control is mainly the welding speed and the welding current size control. Test results show that high current, rapid welding can effectively prevent the generation of stomata. Alloy Steel Pipe and Tube This is mainly due to the welding process in the faster welding through the weld, molten metal heating time is short, the opportunity to absorb less gas