... 4.Material:Carbon Steel,Alloy Steel,Stainless STD WT A53 GR B ERW BEVELED ENDS PIPE SpecificationsChina StandardSteel ... B, X42APIoil casing andtubing in oil wellsSeamles Steel TubesGB5310-199520G, 20MnG, 25MnG, 15MoG, 20MoG, 12Cr1MoVG, 15CrMoVG, 12Cr2MoG, 12Cr2MoWVTiB, 12Cr3MoVSiTiB,ASTM A106 ... 21990Seamless Steel TubesGB3087-199910, 20ASTM A179, ASTM A192for low and Medium Pressure BoilersASTM SA179, ...