... , bicycle stand, as well as construction using steel scaffolding. Steel Pipe Manufacturing circular parts, can improve material utilization, simplify the manufacturing process ... -2008, GB9948-2006, GB8162-20082. Carbon Material:20#, 35#,45#,CK45,ST45,ST55,SA106B3. Alloy Material: 15CrMoG, 12CrMoVG, 10CrMo910, A335P11, T91, A387 ...