Structural seamless tube (GB/T8162-2008) is used for general structures and mechanical structures.
2. Seamless steel tubes for fluid conveyance (GB/T 8163-2008) are general-purpose seamless tubes used for transporting fluids such as water, oil, and gas.
3. Seamless steel tubes for low and medium pressure boilers (GB3087-2008) are hot-rolled and cold drawn (rolled) seamless steel tubes made of carbon structural steel, used for manufacturing superheated steam pipes, water-tube boilers, superheated steam pipes for locomotive boilers, large flue pipes, small flue pipes, and arch brick tubes for various structural low and medium pressure boilers.
4. Seamless pipes for high-pressure boilers (GB5310-2008) are carbon steel, alloy steel, and stainless heat-resistant steel seamless pipes used for the heating surfaces of water-tube boilers for high-pressure and above.
5. High-pressure seamless steel pipes for fertilizer equipment (GB6479-2000) are carbon and alloy steel seamless pipes designed for chemical equipment and pipelines that operate at temperatures of -40 to 400°C and pressures of 10 to 30 Ma.
6. Seamless pipes for oil cracking (GB9948-2006) are suitable for furnace tubes, heat exchangers, and pipeline seamless pipes in oil refineries.
7. Steel pipes for geological drilling (YB235-70) are used by geological departments for core drilling. They can be categorized by application into drill pipes, drill stems, core tubes, casing pipes, and sedimentation pipes, etc.
8. Seamless pipes for diamond core drilling (GB3423-82) are used as drill rods, core rods, and casing for diamond core drilling operations.
9. Oil drilling pipes (YB528-65) are seamless tubes with either thickened inner or outer walls, used for oil drilling purposes.
10. Carbon Steel Seamless Pipes for Shipbuilding (GB5312-85)
