Technical Standards for Seamless Steel Pipes

Technical standards for seamless steel pipes in China:

Seamless steel pipes are divided into hot-rolled (extruded) seamless steel pipes and cold-drawn (rolled) seamless steel pipes due to their different manufacturing processes. Cold drawn (rolled) tubes are divided into two types: round tubes and special-shaped tubes. Seamless steel pipes are divided into the following varieties due to their different uses:

1. Seamless steel pipe for structure (GBT8162-2008). Mainly used for general structure and mechanical structure. Its representative materials (brands): carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
2. Seamless steel pipe for conveying fluid (GBT8163-2008). Mainly used in engineering and large-scale equipment to transport fluid pipelines. The representative material (brand) is 20, Q345, etc.

3. Seamless steel pipes for low and medium pressure boilers (GB3087-2008 seamless boiler tube) are used to manufacture superheated steam pipes, boiling water pipes for low and medium pressure boilers of various structures and superheated steam pipes for locomotive boilers, large smoke pipes, small smoke pipes and arch bricks. High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes for pipes. Representative materials are 10 and 20 steel.

4. Seamless steel pipes for high-pressure boilers (GB5310-2008) are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless steel pipes for the heating surface of water-tube boilers with high pressure and above. Representative materials are 20G, 12Cr1MoVG, 15CrMoG, etc.
5. Seamless steel pipe for high-pressure 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 to 400 ℃ and a working pressure of 10 to 30 Ma. Representative materials are 20, 16Mn, 12CrMo, 12Cr2Mo, etc.
6. Seamless steel pipes for petroleum cracking (GB9948-2006). Mainly used in boilers, heat exchangers and fluid pipelines of petroleum smelters. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.

7. Steel pipes for geological drilling (YB235-70) are steel pipes used for core drilling by geological departments. They can be divided into drill pipes, drill collars, core pipes, casing pipes and sedimentation pipes according to their purposes.
8. Seamless steel pipes for diamond core drilling (GB3423-82) are seamless steel pipes for drill pipes, core rods, and casings used for diamond core drilling.
9. Petroleum drilling pipe (YB528-65) is a seamless steel pipe used for thickening inside or outside at both ends of oil drilling. Steel pipes are divided into two types: wire and non-wired. Wired pipes are connected by joints, and non-wired pipes are connected with tool joints by butt welding.

10. Carbon steel and carbon-manganese steel seamless steel pipes for ships (GB/5312-1999) are carbon steel seamless steel pipes used in the manufacture of Class I pressure piping systems, Class II pressure 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℃. Representative materials are 360, 410, 460 steel grades, etc.
11. Seamless steel tubes for automobile axle sleeves (GB3088-82) are high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel tubes for the manufacture of automobile axle sleeves and drive axle axle tubes.
12. High-pressure oil pipes for diesel engines (GB3093-86) are cold-drawn seamless steel pipes used to manufacture high-pressure pipes for diesel engine injection systems.

13. Precision inner diameter seamless steel tubes for hydraulic and pneumatic cylinders (GB8713-88 seamless mechanical tube) are cold-drawn or cold-rolled precision seamless steel tubes with precise inner diameters for the manufacture of hydraulic and pneumatic cylinders.
14. Cold-drawn or cold-rolled precision seamless steel pipe (GB3639-83) 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. The use of precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining man-hours, increase material utilization, and at the same time help improve product quality.
15. Structural stainless steel seamless steel pipes (GB/T14975-2002) are hot-rolled ( Extruded, expanded) and cold drawn (rolled) seamless steel tubes.
9. Petroleum drilling pipe (YB528-65) is a seamless steel pipe used for thickening inside or outside at both ends of oil drilling. Steel pipes are divided into two types: wire and non-wired. Wired pipes are connected by joints, and non-wired pipes are connected with tool joints by butt welding.

16. Stainless steel seamless steel pipes for fluid transportation (GB/T14976-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipes made of stainless steel used to transport fluids.
17. Special-shaped seamless steel pipe is a general term for seamless steel pipes with cross-sectional shapes other than round pipes. According to the different shape and size of the steel pipe section, it can be divided into equal-thickness special-shaped seamless steel pipe (code D), unequal-thickness special-shaped seamless steel pipe (code BD), and variable diameter special-shaped seamless steel pipe (code BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and machines.
Mechanical parts. Compared with round pipes, special-shaped pipes generally have larger moments of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel.
18. Seamless steel pipes for gas cylinders (GB18248-2000). Mainly used to make various gas and hydraulic cylinders. Its representative materials are 37Mn, 34Mn2V, 35CrMo, etc.

In addition, there are GB/T17396-1998 (hot-rolled seamless steel tubes for hydraulic props), GB3093-1986 (high-pressure seamless steel tubes for diesel engines), GB/T3639-1983 (cold drawn or cold-rolled precision seamless steel tubes), GB /T3094-1986 (cold drawn seamless steel pipe special-shaped steel pipe), GB/T8713-1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders), GB13296-1991 (stainless steel seamless steel pipe for boilers and heat exchangers), GB/T14975 -2002 (Stainless steel seamless steel pipe for structural use), GB/T14976-2002 (Stainless steel seamless steel pipe for fluid transport), GB/T5035-1993 (Seamless steel pipe for automobile axle casing), API SPEC5CT-1999 (Casing and tubing Specification) and so on.

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