... . Steel Pipe Manufacturing circular parts, can improve material utilization, simplify the manufacturing process, saving materials ... , GB9948-2006, GB8162-20082. Carbon Material:20#, 35#,45#,CK45,ST45,ST55,SA106B3. Alloy Material: 15CrMoG, 12CrMoVG, 10CrMo910, A335P11, ... hot finish Product CategoryMain MaterialExecutive StandardSize rangePrecision Tube10#20#35#45#16Mn35CroGB/T3639-200010-90×2.5- ...