Seamless steel tubes for oil cracking (GB9948-88) are suitable for furnace tubes, heat exchangers, and pipeline tubes in oil refineries.

7. Steel pipes for geological drilling (YB235-70) are used by geological departments for core drilling operations.

8. Seamless steel tubes for diamond core drilling (GB3423-82) are used as drill rods, core rods, and casing for diamond core drilling operations.

9. The oil drilling pipe (YB528-65) is a seamless steel tube with internal or external thickening at both ends for oil drilling purposes. The tubes are available in two types: threaded and unthreaded. Threaded pipes are connected using joints, while unthreaded pipes are joined with butt welding and tool joints.

10. Carbon steel seamless steel tubes for ship use (GB5213-85) are used to manufacture I-grade pressure-resistant pipelines, II-grade pressure-resistant pipelines, boilers, and superheaters. The working temperature of the carbon steel seamless steel tube wall does not exceed 450°C, while the working temperature of the alloy steel seamless steel tube wall exceeds 450°C.

11. Seamless steel tubes for automotive half-shaft bushes (GB3088-82) are hot-rolled seamless steel tubes made of carbon and alloy structural steel, used for manufacturing half-shaft bushes and drive axle tube shells for vehicles.

12. Diesel engine high-pressure fuel pipes (GB3093-86) are cold drawn seamless steel tubes used for manufacturing high-pressure pipes in diesel engine injection systems.

13. Precision seamless steel tubes with precise inner diameter for hydraulic and pneumatic cylinders (GB8713-88) are cold drawn or cold rolled precision seamless steel tubes with precise inner diameter dimensions, used for manufacturing hydraulic and pneumatic cylinders.

14. Cold drawn or cold rolled precision seamless steel tubes (GB3639-83) are high-precision cold drawn or cold rolled seamless steel tubes with excellent surface finish, used for mechanical structures and hydraulic equipment. Using precision seamless steel tubes in the manufacturing of mechanical structures or hydraulic equipment can significantly reduce machining time, improve material utilization, and also contribute to enhancing product quality.

15. Structural seamless stainless steel tubes (GB/T14975-1994) are hot-rolled (extruded, expanded) and cold drawn (rolled) seamless steel tubes made of stainless steel, widely used in industrial applications such as chemicals, petroleum, light industry, food, and machinery, serving as corrosion-resistant piping and structural components as well as parts.