Material Carbon Steel like A234 WPB, 20G, A105, Q235A/B and alloy steel like ASTM A234 WP5, WP11, WP12 Executive Standard ASME B 16.9, DIN, JIS, BS, etc Size 1/2"-24" Wall Thickness SCH10~SCH160, STD, XS, XXS Type Seamless Welding Method Butt Welding Surface Treatment grit blasting, black or transparent painting or according to the requirement of client