... , USA, Canada, Taiwan, Korea, Vietnam, India , Pakistan, Iran, and so on. Steel pipematerialGB10#,20#,45#,20G.16Mn,27SiMn,15CrMoG ... A 709,ASTMA302,ASTMA537,API X52,API X 42 and so on.specificationThickness:0.5mm-140mmProduction technologyHot rolledCold ... (180#,220#,240#,320#400#,600#), Hairline,aid pickling and so onProduction technologySeamless steel pipeWelded steel pipeSurface treatmentPolishing or ...