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6 inch API 5L steel pipes product specifications 1.Thickness:SGP(5mm),SCH10(3.40mm),STD(7.11mm),SCH40(7.11mm),XS(10.97mm),SCH80(10.97mm), 2.SCH120(15.09mm),SCH160(18.26mm),XXS(21.95mm) 3.Thickness ...