... /4 "---72 " 3.Thickness: SCH20, SGP, STD, SCH40, SCH80 Carbon Steel Pipe FittingsCarbon steel pipefittings Place of Origin: China Material: ASTM A234WPB1 ... /2615/2616, ASME B36.10M---19964) Material: ASTM A234 WPB, carbon steel5) Surface treatment: black rust-proof oil, transparent oil, hot ...