The outer diameter of hot-rolled seamless steel pipes is generally greater than 32mm and the wall thickness is 2.5-75mm. The outer diameter of cold-rolled seamless steel pipes can be up to 6mm and the wall thickness can be up to 0.25mm. The outer diameter of thin-walled pipes can be up to 5mm and the wall thickness is less than 0.25mm. Rolling has higher dimensional accuracy than hot rolling
1.
Seamless steel pipes for general structural use: GB/T8162-2018
2. Ground seam steel pipes for transporting fluids: GB/T8163-2018
3. Seamless steel pipes for boilers: GB/T3087-2018
4. High-pressure seamless pipes for boilers: GB/T5310-2018 (ST45.8-Ⅲ type)
5. High-pressure seamless steel pipes for fertilizer equipment: GB/T6479-2018
6. Seamless steel pipe for geological drilling: YB/T235-70
7. Seamless steel pipe for oil drilling: YB/T528-65
8. Seamless steel pipe for petroleum cracking: GB/T9948-88
9. Special seamless pipe for oil drill collars: YB691-70
10. Seamless steel pipe for automobile half shaft: GB/T3088-2018
11. Seamless steel pipes for ships: GB/T5312-2018
12. Cold drawn and cold rolled precision seamless steel pipe: GB/T3639-2018
13. Various alloy tubes 16Mn, 27siMn, 15CrMo, 35CrMo, 12CrMov, 20G40Cr12Cr1MoV15CrMo.
In addition, there is also GB/T17396-2018 (hot-rolled seamless steel pipe for hydraulic props)
GB/T3093-2018 (High-pressure seamless steel pipe for diesel engines)
GB/T3639-2018 (cold drawn or cold precision seamless steel pipe)
GB/T3094-2018 (cold drawn seamless steel pipe special-shaped steel pipe)
GB/T8713-2018% (Precision inner diameter seamless steel pipe for hydraulic and pneumatic cylinders)
GB/T13296-2018 (Stainless steel seamless steel pipes for boilers and heat exchangers)
GB/T14975-2018 (Stainless steel seamless steel pipe for structural use)
GB/T14976-2018 (Stainless steel edge-free steel pipes for fluid transportation Q)
GB/T5035-2018 (
Seamless steel pipe for automobile half shaft sleeve Q)
API SPEC5CT-2018 (Casing and Tubing Specification)
GB9711.1-2018 (natural gas transmission), etc.
