The use of different types of seamless steel pipes

　　1. Structural seamless steel pipes (GB/T8162-1999) are seamless steel pipes used for general structures and mechanical structures.

　　2. Seamless steel pipe for fluid transportation (GB/T8163-1999) is a general seamless steel pipe used to convey fluids such as water, oil, and gas.

　　3. Seamless steel pipes for low and medium pressure boilers (GB3087-1999) are used to manufacture superheated steam pipes, boiling water pipes for low and medium pressure boilers of various structures, superheated steam pipes, large smoke pipes, small smoke pipes and arch bricks for locomotive boilers High-quality carbon structural steel hot-rolled and cold-drawn (rolled) seamless steel pipes for pipes.

　　4. Seamless steel pipes for high-pressure boilers (GB5310-1995) are high-quality carbon steel, alloy steel, and stainless heat-resistant seamless steel pipes for the heating surface of water tube boilers for high pressure and above.

　　5. The high-pressure seamless steel pipe for chemical fertilizer equipment (GB6479-2000) is a high-quality carbon structural steel and alloy steel seamless steel pipe suitable for chemical equipment and pipelines with a working temperature of -40~400°C and a working pressure of 10~30Ma.

　　6. Seamless steel pipes for petroleum cracking (GB9948-88) are seamless steel pipes suitable for furnace tubes, heat exchangers, and pipes in petroleum refineries.

　　7. Steel pipes for geological drilling (YB235-70) are steel pipes used by geological departments for core drilling. According to their uses, they can be divided into drill pipes, drill collars, core pipes, casing pipes, and sedimentation pipes.

　　8. Seamless steel pipes for diamond core drilling (GB3423-82) are seamless steel pipes used for drill pipes, core rods, and casings for diamond core drilling.

　　9. An oil drilling pipe (YB528-65) is a seamless steel pipe used for oil drilling with inner or outer thickening at both ends. There are two types of steel pipes: threaded and non-threaded. The threaded pipes are connected with joints, and the non-threaded pipes are connected with tool joints by butt welding.

　　10. Carbon steel seamless steel pipes for ships (GB5213-85) are carbon steel seamless steel pipes for the manufacture of Class I pressure-resistant piping systems, Class II pressure-resistant piping systems, boilers, and superheaters. The working temperature of the carbon steel seamless steel pipe wall does not exceed 450°C, and the working temperature of the alloy steel seamless steel pipe wall exceeds 450°C.

　　11. The seamless steel pipe for automobile half-shaft casing (GB3088-82) is a hot-rolled seamless steel pipe of high-quality carbon structural steel and alloy structural steel for the manufacture of automobile half-shaft casing and drive axle casing shaft pipe.

　　12. High-pressure fuel pipe for diesel engine (GB3093-86) is a cold-drawn seamless steel pipe for manufacturing high-pressure pipe of diesel engine injection systems.