... tubing materials that are imported or domestic production to service steel pipe:Steel standard: ASTM, JIS, DIN, GB, EN, BS.Materials: 10#, 20 ... #, 16Mn, 20G, 15CrMoG, 12Cr1MoVG, 10CrMo910 A335P12, A335P11, A335P91, STPA22,STPA25, A106B, A06C, ST45.8B, P11, P12, P22,P5, P9, P91, T91 ... . We can make sure our product high quality & competitive price! Steel Pipe