... and ERWSize1/2" To 24"Wall thicknessSch5S-Sch160, XS,XXSStandardsANSI, ASTM,API,DIN, JIS, BS, ISO, GB, SH, AND HG etc ... MaterialCarbon Steel: ASTM A53/A106,ASTM A179,API 5L X42/52/60Surface treatmentBlack painting, anti ... -party certification to ensure our product quality. carbon steel pipe/ASTM