seamless steel pipe

Seamless steel pipe is a long strip of steel with a hollow section and no joints around it. The seamless steel pipe has a hollow section and can be used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and some solid materials. Compared with solid steel such as round steel, seamless steel pipe is lighter in weight when the bending and torsional strength is the same. , bicycle racks and steel scaffolding used in construction. Making ring parts with seamless steel pipes can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sets, etc.,

which are widely used in steel pipe manufacturing. Steel pipe is also an indispensable material for various conventional weapons. Gun barrels, barrels, etc. must be made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Since the area of ​​the circle is the largest under the condition of equal perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes. However, round pipes also have certain limitations. For example, under the condition of plane bending, round pipes are not as strong as square and rectangular pipes. Some agricultural machinery skeletons, steel and wood furniture, etc., are commonly used. Special-shaped steel pipes with other cross-sectional shapes are also required according to different purposes.

1. Seamless steel pipe for structure (GB/T8162-2008) is a seamless steel pipe used for general structure and mechanical structure.
2. Seamless steel pipe for fluid transportation (GB/T12771-2008) is a general seamless steel pipe used to transport water, oil, gas and other fluids.
3. Seamless steel pipes for low and medium pressure boilers (GB/T3087-2008) are used to manufacture various structures of low and medium pressure boiler superheated steam pipes, boiling water pipes and superheated steam pipes, large smoke pipes, small smoke pipes and locomotive boilers. High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes for arch brick pipes.
4. High-pressure boiler seamless steel pipe (GB5310-2008) is a high-quality carbon steel, alloy steel and stainless heat-resistant seamless steel pipe used for the heating surface of water-tube boilers with high pressure and above.
5. High-pressure seamless steel pipe for fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with a working temperature of -40~400℃ and a working pressure of 10~30Ma.
6. Seamless steel pipes for petroleum cracking (GB9948-2006) are seamless steel pipes for furnace tubes, heat exchangers and pipelines in petroleum refineries.
7. The steel pipe for geological drilling (YB235-70) is a steel pipe used by the geological department for core drilling. It can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe according to the purpose.
8. Seamless steel pipe for diamond core drilling (GB/T3423-82) is a seamless steel pipe for drill pipe, core pipe and casing for diamond core drilling.
9. Oil drilling pipe (YB528-65) is a seamless steel pipe that is thickened internally or externally at both ends of oil drilling. The steel pipe is divided into two types: threading and non-threading. The threading pipe is connected with the joint, and the non-threading pipe is connected with the tool joint by the method of butt welding.
10. The carbon steel seamless steel pipe for ships (GB5312-2009) is a carbon steel seamless steel pipe for the manufacture of Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers and superheaters. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450 ℃, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450 ℃.
11. Seamless steel pipes for automobile axle casings (GB3088-82) are high-quality carbon structural steel and alloy structural steel hot-rolled seamless pipes for manufacturing automobile axle casings and axle casings of drive axles.
12. High-pressure oil pipe for diesel engine (GB3093-2002) is a cold-drawn seamless steel pipe for manufacturing high-pressure pipe of diesel engine injection system.
13. Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders (GB8713-88) is a cold-drawn or cold-rolled precision seamless steel pipe with precise inner diameter for manufacturing hydraulic and pneumatic cylinders.
14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-2000) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment.
15. Structural stainless steel seamless steel pipe (GB/T14975-2002) is a hot-rolled ( Extrusion, expansion) and cold drawn (rolled) seamless steel pipes.
16. Stainless steel seamless steel pipe for fluid transportation (GB/T14976-2002) is a hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipe made of stainless steel for fluid transportation.
17. Special-shaped seamless steel pipe is a general term for seamless steel pipes with other cross-sectional shapes other than round pipes. According to the shape and size of the steel pipe section, it can be divided into equal-wall thickness special-shaped seamless steel pipe (code D), unequal wall thickness special-shaped seamless steel pipe (code BD), variable diameter special-shaped seamless steel pipe (code BJ). Shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with the round tube, the special-shaped tube generally has a larger moment of inertia and section modulus, and has a larger bending and torsion resistance, which can greatly reduce the structural weight and save steel.