The
seamless steel pipe is divided into cold drawn and hot rolled, but the surface has not been treated.
There are several types of seamless steel pipes. They are related to its material and implementation standards. The materials include ordinary pipes and alloy pipes. The implementation standards are
1. The structure is used for seamless steel pipes: GB8162-99
2. Ground seam steel pipe for conveying fluid: GB8163-99
3. Seamless steel pipe for boiler: GB3087-1999
4. High pressure seamless pipe for boiler: GB5310-95 (ST45.8-ⅲ type)
5. High-pressure seamless steel pipes for fertilizer equipment: GB6479-1999
6. Seamless steel pipe for geological drilling: YB235-70
7. Seamless steel pipe for oil drilling: YB528-65
8. Seamless steel pipe for petroleum cracking: GB9948-88
9. Special seamless pipe for oil drill collar: YB691-70
10. Seamless steel pipe for automobile half shaft: GB3088-1999
11. Seamless steel pipe for ships: GB5312-1999
12. Cold-drawn cold-rolled precision seamless steel pipe: GB3639-1999
13. Various alloy tubes 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo
