... steel pipe Is widely used in transportation of oil, natural gas, gas, water and some solid materials, pipes, etc., lighter, ... GB8163-2008, GB9948-2006, GB8162-20082. Carbon Material:20#, 35#,45#,CK45,ST45,ST55,SA106B3. Alloy Material: 15CrMoG, 12CrMoVG, 10CrMo910, ... hot finishProduct CategoryMain MaterialExecutive StandardSize rangePrecision Tube10#20#35#45#16Mn35CroGB/T3639-200010-90×2.5-18(mm)Alloy ...