Structural seamless tubes (GB/T8162-2008) are used for general and mechanical structures.
2. Seamless steel tubes for fluid conveyance (GB/T 8163-2008) are general 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 from 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 steel tubes for high-pressure boilers (GB5310-2008) are used to manufacture heat surfaces for water tube boilers at high pressure and above, including carbon steel, alloy steel, and stainless heat-resistant steel seamless tubes.
5. High-pressure seamless steel tubes for fertilizer equipment (GB6479-2000) are carbon and alloy steel seamless tubes designed for chemical equipment and pipelines that operate at temperatures of -40 to 400°C and pressures of 10 to 30 MPa.
6. Seamless steel tubes for oil cracking (GB9948-2006) are suitable for furnace tubes, heat exchangers, and pipeline seamless tubes in oil refineries.
7. The geological drilling steel pipes (YB235-70) are used by geological departments for core drilling operations. They can be categorized by their applications, including drill rods, drill stems, core tubes, casing pipes, and sedimentation pipes.
8. Seamless tubes for diamond core drilling (GB3423-82) are used as drill rods, core rods, and casing tubes for diamond core drilling operations.
9. The oil drilling pipe (YB528-65) is a seamless tube used for oil drilling, featuring either internally or externally thickened ends.
10. Seamless Carbon Steel Pipes for Shipbuilding (GB5312-85)
China Classification Society's Material and Welding Standards - China Classification Society (CCS)
DNV Standards - DNV
