1. Cold drawn or cold rolled precision seamless steel tubes (GB3639-83) are cold drawn or cold rolled precision seamless steel tubes with high dimensional accuracy and good surface finish for mechanical structures and hydraulic equipment. Selecting precision seamless steel pipe to manufacture mechanical structure or hydraulic equipment can greatly save machining hours, improve material utilization and improve product quality.

2. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling, which can be divided into drill pipes, drill collars, core pipes, casings and settling pipes according to their uses.

3. Marine carbon steel seamless steel pipe (GB5213-85) is a carbon steel seamless steel pipe used for manufacturing Class I pressure pipe system, Class II pressure pipe system, boiler and superheater. The working temperature of carbon steel seamless steel pipe wall shall not exceed 450 ℃, and that of alloy steel seamless steel pipe wall shall exceed 450 ℃.

4. Seamless steel tubes for low and medium pressure boilers (GB3087-1999) are hot-rolled and cold drawn (rolled) seamless steel tubes made of high-quality carbon structural steel used to manufacture 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.

5. High pressure fuel pipe for diesel engine (GB3093-86) is a cold drawn seamless steel pipe used to manufacture high pressure fuel pipe for diesel engine injection system.

6. The oil drilling pipe (YB528-65) is a seamless steel pipe used for internal thickening or external thickening at both ends of oil drilling. The steel pipe is divided into two types: turning thread and non turning thread. The turning thread pipe is connected with a joint, and the non turning thread pipe is connected with a tool joint by butt welding.