... :1/2"to 72" Thickness:sch5-sch160,XS, XXS Standard:ASTM , DIN , JIS Certificate:API,ISO,CCS Seamless SCH 40 ... , inner disc stick to shape.Wall thicknessSCH5S-SCH160, XS XXSStandardsANSI , ASTM , DIN , JIS, EN , BS, GB , SH and HG etcMaterialStainless steel ... , 56 , 60 , 65 , 70 , 80Alloy Steel:ASTM A234 WP1, WP5 , WP9 , WP11,WP22, WP91Low Temperature:ASTM A420 WPL 1,WPL3 ,WPL 6Surface treatmentBlack ...