... Korea, Vietnam, India , Pakistan, Iran, and so on. Steel pipematerialGB10#,20#,45#,20G.16Mn,27SiMn,15CrMoG,12Cr1MoU ... coatedGalvanizedothersortingStructural pipe, fluid pipe, boiler pipe, oil pipe, gas pipe, API pipe, alloy steel pipe, carbon steel pipe and so on.Steel ... API X52,API X 42 and so on.specificationThickness:0.5mm-140mmProduction technologyHot rolledCold rolledsortingPressure ...