Introduction to seamless steel pipe standards

Seamless steel pipes play a vital role in urban construction. Their quality directly affects the solidity and quality of living buildings.

If you want to choose a high-quality square pipe in the square pipe market, you must first learn to identify inferior Steel Pipes.
Due to their different manufacturing processes, seamleSs Steel pipes are divided into hot-rolled (extruded) seamless steel pipes and cold-drawn (rolled) seamless steel pipes. Cold-drawn (rolled) pipes are divided into round pipes and special-shaped pipes. Seamless steel pipes are divided into the following varieties due to their different uses:
1. Seamless steel pipes for structures (GBT8162-2008). Mainly used for general structures and mechanical structures. Its representative materials (grades): carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
2. Seamless steel pipes for conveying fluids (GBT8163-2008). Mainly used for conveying fluid pipelines on engineering and large equipment. Representative materials (grades) are 20, Q345, etc.
3. Seamless steel pipes for low and medium pressure boilers (GB3087-2008) are high-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes used to manufacture various structural low and medium pressure boiler superheated steam pipes, boiling water pipes and locomotive boiler superheated steam pipes, large smoke pipes, small smoke pipes and arch brick 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 used to manufacture 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 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). Mainly used for boilers, heat exchangers and fluid conveying pipelines in petroleum refineries. Its representative materials are 20, 12CrMo, 1Cr5Mo, 1Cr19Ni11Nb, etc.
7. Geological drilling steel pipe (YB235-70) is a steel pipe used by geological departments for core drilling. According to the purpose, it can be divided into drill pipe, drill collar, core pipe, casing and sedimentation pipe, etc.
8. Diamond core drilling seamless steel pipe (GB3423-82) is a seamless steel pipe for drill rods, core rods and casings used for diamond core drilling.
9. Petroleum drilling pipe (YB528-65) is a seamless steel pipe with internal or external thickening at both ends used for petroleum drilling. Steel pipes are divided into threaded and non-threaded types. Threaded pipes are connected with joints, and non-threaded pipes are connected with tool joints by butt welding.
10. Carbon steel and carbon manganese steel seamless steel pipes for ships (GB/T 5312-2009) are suitable for manufacturing Class I pressure piping systems, Class II pressure piping systems, and carbon steel and carbon manganese steel seamless steel pipes for boilers and superheaters. Seamless steel pipes for pressure piping systems are divided into 3 levels according to design pressure and design temperature. The working temperature of the seamless steel pipe wall for boilers and superheaters should not exceed 450℃.
11. Seamless steel pipe for automobile half-axle sleeve (GB3088-82) is a hot-rolled seamless steel pipe made of high-quality carbon structural steel and alloy structural steel for manufacturing automobile half-axle sleeve and drive axle axle housing axle tube.
12. High-pressure oil pipe for diesel engine (GB3093-86) 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 cylinder (GB8713-88) is a cold-drawn or cold-rolled precision seamless steel pipe with precise inner diameter for manufacturing hydraulic and pneumatic cylinder.
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 time, improve material utilization, and help improve product quality.
1 5. Seamless stainless steel pipe for structure (GB/T14975-2002) is a hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipe made of stainless steel widely used in corrosion-resistant pipes and structural parts and components in chemical, petroleum, textile, medical, food, machinery and other industries.
16. Seamless stainless 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 conveying fluid.
17. Special-shaped seamless steel pipe is a general term for seamless steel pipes with other cross-sectional shapes except round pipes. According to the different cross-sectional shapes and sizes of steel pipes, they can be divided into equal wall thickness special-shaped seamless steel pipes (code D), unequal wall thickness special-shaped seamless steel pipes (code BD), and variable diameter special-shaped seamless steel pipes (code BJ). Special-shaped seamless steel pipes are widely used in various structural parts, tools and mechanical parts. Compared with round tubes, special-shaped tubes generally have larger moments of inertia and section modulus, and have greater bending and torsion resistance, which can greatly reduce the weight of the structure 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 pipe for hydraulic support), GB3093-1986 (high-pressure seamless steel pipe for diesel engine), GB/T3639-1983 (cold-drawn or cold-rolled precision seamless steel pipe), GB/T3094-1986 (cold-drawn seamless steel pipe and special-shaped steel pipe), GB/T8713-1988 (precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinder), GB13296-1991 (stainless steel seamless steel pipe for boiler and heat exchanger), GB/T14975-2002 (stainless steel seamless steel pipe for structure), GB/T14976-2002 (stainless steel seamless steel pipe for fluid transportation), GB/T5035-1993 (seamless steel pipe for automobile half-axle casing), API SPEC5CT-1999 (casing and oil pipe specification), etc.