Name Stainless Steel Pipe Standard ASTM, GB, JIS, DIN, EN, AISI Material Grade TP304 TP304L TP316 TP316L TP347 TP347H TP321 TP321H TP310 TP310S TP410 TP410S TP403 S31803/S32205 S32750 S32760 Outer Diameter Seamless Pipe: 3mm-1420mm Welded Pipe: 2mm-1420mm Thickness Seamless Pipe: 2mm - 40mm Welded Pipe: 2mm-40mm Length 1.0-6.0m or as consumers requirement Tolerance Acording to the Standard. Surface Hairline-180G, 320G, 400G Satin Mirror finish--400G, 500G, 600G or 800G Original Tianjin City Application Petrochemical industry, chemical fertilizer industry, oil refining industry, oil and gas industry, light industry and food industry, pulp and paper industry, energy and environmental industries. Test UT, ET, HT, RT,ect, and others according to the standard,or as the requests of the customers