Seam steel pipes are divided into cold-drawn and hot-rolled, but the surface has not been treated. There are several types of seamless steel pipes.
In terms of its material and implementation standards, the materials include ordinary pipes and alloy pipes.
The implementation standards are
1. For seamless steel pipe: 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 pipe for fertilizer equipment: GB6479-1999
6. Seamless steel pipe for geological drilling: YB235-70
7. Seamless steel pipe for petroleum drilling: YB528-65
8. Seamless steel pipe for petroleum cracking: GB9948-88
9 , Petroleum drill collar special seamless pipe: YB691-70
10. Seamless steel pipe for automobile axle shaft: GB3088-1999
11. Seamless steel pipe for ship: GB5312-1999
12. Cold drawn cold-rolled precision seamless steel pipe: GB3639-1999
13. Various alloy pipes 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo steel pipes are divided into seamless steel pipes and welded steel pipes according to different production processes. Seamless steel pipes are seamless steel pipes made by perforating steel ingots, tube blanks or steel bars; welded pipes are made by welding hot-rolled or cold-rolled steel plates and steel strip coils, and can be welded longitudinally or spirally.
