... service 3 Reasonable price 4 Various styles Detailed product description Carbon Steel Pipes 1. Standard:GB5310-2008, GB6479-2000, ASTM ... 20082. Carbon Material:20#, 35#,45#,CK45,ST45,ST55,SA106B3. Alloy Material: 15CrMoG, 12CrMoVG, 10CrMo910, A335P11, T91, A387, Wb364. Surface: black painting ... do you want to purchase ?What we can offer are carbon steel plate ,pipe ,coil and stainless plate ,pipe , ...