1. Seamless pipe for structure (GB/T8162-2008) is a seamless pipe for general structure and mechanical structure.
　　2. Seamless pipe for fluid transportation (GB/T8163-2008) is a general seamless pipe used to transport water, oil, gas and other fluids.
3. Seamless tubes for low and medium pressure boilers (GB3087-2008) are used to manufacture superheated steam tubes, boiling water tubes for low and medium pressure boilers of various structures, and superheated steam tubes for locomotive boilers, large smoke tubes, small smoke tubes and arch bricks High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless pipes for pipes.
　　4. Seamless pipes for high-pressure boilers (GB5310-2008) are high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless pipes for the heating surface of water-tube boilers with high pressure and above.
　　5. High-pressure seamless pipe for fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless pipe suitable for chemical equipment and pipelines with a working temperature of -40~400℃ and a working pressure of 10~30Ma.
　　6. ​​Seamless pipes for petroleum cracking (GB9948-2006) are seamless pipes for furnace tubes, heat exchangers and pipelines in petroleum refineries.
　　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 uses.
　　 8. Seamless pipe for diamond core drilling (GB3423-82) is a seamless pipe for drill pipe, core rod, and casing used for diamond core drilling.
　　9. Petroleum drilling pipe (YB528-65) is a seamless pipe with internal or external thickening at both ends of oil drilling. There are two types of steel pipes: 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 seamless pipe for ships (GB5312-85)
　　 China Classification Society Material and Welding Rules-China Classification Society (CCS)
　　 Det Norske Veritas (DNV) specification-Det Norske Veritas (DNV)
　　Lloyd’s Register of Shipping (LR) specification-Lloyd’s Register of Shipping (LR)
　　 German Lloyd’s Register of Shipping (GL) specification-German Lloyd’s Register of Shipping (GL)
　　 American Bureau of Shipping (ABS) specifications-American Bureau of Shipping (ABS)
　　 Bureau Veritas (BV) specification-Bureau Veritas (BV)
　　Italian Register of Shipping (RINA) specifications-Italian Register of Shipping (RINA)
　　 Japan Register of Shipping (NK) specifications-Japan Register of Shipping (NK)
　　 is a carbon steel seamless pipe used in the manufacture of Class I pressure piping systems, Class II pressure piping systems, boilers and superheaters for ships. The working temperature of the carbon steel seamless pipe wall does not exceed 450℃, and the working temperature of the alloy steel seamless pipe wall exceeds 450℃.
　　11. Seamless pipes for automobile axle sleeves (GB3088-82) are high-quality carbon structural steel and alloy structural steel hot-rolled seamless pipes used in 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 pipes used to manufacture high-pressure pipes for diesel engine injection systems.
　　 13. Precision inner diameter seamless pipes for hydraulic and pneumatic cylinders (GB8713-88) are cold drawn or cold-rolled precision seamless pipes with precise inner diameters for the manufacture of hydraulic and pneumatic cylinders.
　　14. Cold-drawn or cold-rolled precision seamless pipe (GB3639-83) is a cold-drawn or cold-rolled precision seamless pipe for mechanical structure and hydraulic equipment with high dimensional accuracy and good surface finish. The use of precision seamless pipes to manufacture mechanical structures or hydraulic equipment can greatly save mechanical processing man-hours, improve material utilization, and at the same time help improve product quality.
15. Structural stainless steel seamless pipe (GB/T14975-2002) is a hot-rolled stainless steel made of corrosion-resistant pipes and structural parts and parts widely used in chemical, petroleum, textile, medical, food, machinery and other industries Extruded, expanded) and cold drawn (rolled) seamless tubes.
　　 16. Stainless steel seamless pipes for fluid transportation (GB/T14976-2002) are hot-rolled (extruded, expanded) and cold-drawn (rolled) seamless pipes made of stainless steel used to transport fluids.
　　17. Shaped seamless pipe is a general term for seamless 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 wall thickness special-shaped seamless pipe (code D), unequal wall thickness special-shaped seamless pipe (code BD), variable diameter special-shaped seamless pipe (code BJ). Special-shaped seamless pipes are widely used in various structural parts, tools and 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 low-temperature pipelines (GB/T18984-2003) are seamless steel pipes for -45℃～-195℃ low-temperature pressure vessel pipes and low-temperature heat exchanger pipes
　　Generally, seamless pipes are made of 10, 20, 30, 35, 45 and other high-quality carbon steels such as 16Mn, 5MnV and other low-alloy structural steels or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steels, such as hot-rolled or cold-rolled. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid transportation pipelines. Seamless pipes made of medium carbon steel such as 45 and 40Cr are used to manufacture mechanical parts, such as stressed parts of automobiles and tractors.　Usually, seamless pipes must be tested for strength and flattening. Hot-rolled steel pipes are delivered in hot-rolled state or heat-treated state; cold-rolled steel pipes are delivered in hot-heated state. Seamless pipes for low and medium pressure boilers: used to manufacture various low and medium pressure boilers, superheated steam pipes, boiling water pipes, water wall pipes and superheated steam pipes for locomotive boilers, large smoke pipes, small smoke pipes and arched brick pipes.
　　 Use high-quality carbon structural steel hot-rolled or cold-rolled (dial) seamless pipe. It is mainly made of No. 10 and No. 20 steel. In addition to ensuring the chemical composition and mechanical properties, it is required to perform hydraulic tests, crimping, flaring, and flattening tests. Hot-rolled products are delivered in the hot-rolled state, and cold-rolled products are delivered in the heat-treated state.