1. Seamless steel pipes for structural purposes (GB/T8162-1999) are seamless steel pipes used for general structures and mechanical structures.
2. Seamless steel pipes for fluid transportation (GB/T8163-1999) are general seamless steel pipes used for transporting fluids such as water, oil, and gas.
3. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are hot-rolled and cold drawn seamless steel tubes made of high-quality carbon structural steel for manufacturing Superheated steam tubes, boiling water tubes for low and medium pressure boilers of various structures and Superheated steam tubes, large smoke tubes, small smoke tubes and arch brick tubes for locomotive boilers.
4. Seamless steel pipes for high-pressure boilers (GB5310-1995) are high-quality carbon steel, alloy steel, and stainless heat-resistant seamless steel pipes used for manufacturing the heating surfaces of high-pressure and above water tube boilers.
5. High pressure seamless steel pipes (GB6479-2000) for fertilizer equipment are high-quality carbon structural steel and alloy steel seamless steel pipes suitable for chemical equipment and pipelines with working temperatures of -40~400 ℃ and working pressures of 10~30 Ma.
6. Seamless steel pipes for petroleum cracking (GB9948-88) are seamless steel pipes suitable for furnace tubes, heat exchangers, and pipelines in petroleum refineries.
7. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling. They can be divided into drill pipes, drill collars, core pipes, casings, and settling pipes according to their purpose.
8. Seamless steel pipe for diamond core drilling (GB3423-82) is a seamless steel pipe used for drilling rods, core rods, and casings in diamond core drilling.
9. Petroleum drilling pipe (YB528-65) is a seamless steel pipe used for internal or external thickening at both ends of petroleum drilling. Steel pipes are divided into two types: threaded and non threaded. The threaded pipe is connected with a joint, while the non threaded pipe is connected with a tool joint using a butt welding method.
10. Carbon steel seamless steel pipes for ships (GB5213-85) 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 shall not exceed 450 ℃, and the working temperature of the alloy steel seamless steel pipe wall shall not exceed 450 ℃.
11. Seamless steel pipe for automotive half axle sleeve (GB3088-82) is a high-quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe used for manufacturing automotive half axle sleeve and drive axle axle housing shaft pipes.
12. High pressure oil pipes for diesel engines (GB3093-2002) are cold-drawn seamless steel pipes used to manufacture high-pressure pipes for diesel engine injection systems.
13. Precision inner diameter seamless steel pipes for hydraulic and pneumatic cylinder barrels (GB8713-88) are cold-drawn or cold-rolled precision seamless steel pipes with precision inner diameter dimensions used in the manufacturing of hydraulic and pneumatic cylinder barrels.
14. Cold drawn or cold-rolled precision seamless steel pipes (GB3639-2000) are precision seamless steel pipes with high dimensional accuracy and good surface finish used in mechanical structures and hydraulic equipment.
Choosing precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining time, improve material utilization, and also improve product quality.
15. Stainless steel seamless steel pipes for structural purposes (GB/T14975-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless steel pipes made of stainless steel, which are widely used in industries such as chemical, petroleum, light textile, medical, food, machinery, and other corrosion-resistant pipelines, structural components, and parts.
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 for fluid transportation.
17. Specially shaped seamless steel pipes are a general term for seamless steel pipes with other cross-sectional shapes except for circular pipes. According to the different cross-sectional dimensions of steel pipes, they can be divided into equal wall thickness irregular seamless steel pipes (code D), unequal wall thickness irregular seamless steel pipes (code BD), and variable diameter irregular seamless steel pipes (code BJ). Specially shaped seamless steel pipes are widely used in various structural components, tools, and mechanical components. Compared with circular pipes, special-shaped pipes generally have larger moments of inertia and cross-sectional modulus, and have greater bending and torsion resistance, which can greatly reduce structural weight and save steel.
