... 4.Standard: ASTM A234 WPB/WPC 5.Quality: good ProductAlloy Steel Pipe P22 Size1/2"-72"Wall ThicknessSCH5S-SCH160 XS XXS ... STDStandardANSI,ASME,JIS,DIN,GB,BS,APIMaterial Carbon steel,Stainless steel,Alloy steelCarbon steel ASTM A234 WPB,WPC;ASTM A420WPL9,WPL3,WPL6 ... fittings and Specialized NAME&HIC Fittings Erw--round,Square,Rectangular Section--steel Pipe--black Colored,Galvanized