1. Seamless Steel Pipe for Structure (GBT8 162-2008). Mainly used in general structures and mechanical structures. Its representative materials (brands): carbon steel, No.20 and No.45 steel; Alloy steels Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
2. Seamless Steel Pipe for Fluid Transportation (GBT8 163-2008). It is mainly used for conveying fluid pipelines in engineering and large-scale equipment. Representative materials (brands) include 20, Q345, etc.
3. Seamless Steel Pipe for Medium and Low Pressure Boilers (GB3087-2008) is a hot-rolled and cold-drawn (rolled) seamless steel pipe of high-quality carbon structural steel, which is used to manufacture superheated steam pipes, boiling water pipes and superheated steam pipes, large smoke pipes, small smoke pipes and arch bricks of various structures of medium and low pressure boilers. The representative materials are 10 and 20 steels.
4. Seamless Steel Pipe for High-pressure Boiler (GB53 10-2008) is a high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipe used for manufacturing the heating surface of high-pressure and above water-tube boilers. Representative materials are 20G, 12Cr 1MoVG, 15CrMoG, etc.
5. Seamless Steel Pipe for High-pressure Fertilizer Equipment (GB6479-2000) is a kind of high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with working temperature of -40~400℃ and working pressure of 10~30Ma. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
6. Seamless Steel Pipe for Petroleum Cracking (GB9948-2006). It is mainly used for boilers, heat exchangers and fluid pipes in petroleum smelters. Its representative materials are 20, 12CrMo, 1Cr5Mo,1Cr19ni1nb, etc.
7. Steel pipes for geological drilling (YB235-70) are used by geological departments for core drilling, and can be divided into drill pipes, drill collars, core pipes, casing pipes and settling pipes according to their uses.
8. Seamless Steel Pipe for Diamond Core Drilling (GB3423-82) is a seamless steel pipe for drill pipe, mandrel and casing for diamond core drilling.
9. Oil drilling pipe (YB528-65) is a kind of seamless steel pipe with both ends thickened internally or externally, which is used for oil drilling. There are two kinds of steel pipes: turning wire and non-turning wire. The turning wire is connected with the joint, and the non-turning wire is connected with the tool joint by butt welding.
10. Marine carbon steel and carbon manganese steel seamless steel pipes (GB/53 12- 1999) are carbon steel seamless steel pipes used for manufacturing primary pressure-resistant piping systems, secondary pressure-resistant piping systems, boilers and superheaters. The working temperature of carbon steel seamless steel pipe wall shall not exceed 450℃, and the working temperature of alloy steel seamless steel pipe wall shall not exceed 450℃. Representative materials are 360, 4 10, 460 steel grades, etc.
1 1. Seamless Steel Pipe for Automobile Bushing (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe for manufacturing automobile bushings and axle housings.
12. Diesel Engine High Pressure Tubing (GB3093-86) is a cold-drawn seamless steel pipe for manufacturing diesel engine injection system high pressure tubing.
13. The precision inner diameter seamless steel pipe (GB87 13-88) for hydraulic cylinder and pneumatic cylinder is a kind of precision cold-drawn or cold-rolled seamless steel pipe with precision inner diameter.
14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) is a precision cold-drawn or cold-rolled seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. Using precision seamless steel tube to manufacture mechanical structure or hydraulic equipment can greatly save processing time, improve material utilization and improve product quality.
15. Seamless Stainless Steel Pipe for Structure (GB/T 14975-2002) is a hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipe made of stainless steel, which is widely used in chemical, petroleum, textile, medical, food and mechanical industries.
16. Seamless Stainless Steel Pipe for Fluid Transportation (GB/T 14976-2002) is a hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipe made of stainless steel, which is used for fluid transportation.
17. Special-shaped seamless steel pipe is the general name of seamless steel pipe with other cross-sectional shapes except circular pipe. According to the different cross-sectional shapes and sizes of steel pipes, they can be divided into special-shaped seamless steel pipes with equal wall thickness (code D), special-shaped seamless steel pipes with unequal wall thickness (code BD) and special-shaped seamless steel pipes with variable diameter (code BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with circular tubes, special-shaped tubes generally have larger moment of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel.
18. Seamless Steel Pipe for Gas Cylinders (GB 18248-2000). Mainly used for manufacturing various gas cylinders and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo and so on.
In addition, there are GB/T 17396- 1998 (hot rolled seamless steel pipe for hydraulic prop), GB3093- 1986 (high pressure seamless steel pipe for diesel engine) and GB/T3639- 1983 (cold drawn or cold rolled). T87 13- 1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders), GB13296-1991(stainless steel seamless steel pipe for boilers and heat exchangers), GB/t1. T 14976-2002 (seamless stainless steel pipe for fluid transportation) GB/T5035- 1993 (seamless steel pipe for automobile shaft sleeve), API SPEC5CT- 1999 (specification for sleeves and pipes), etc.