Manufacturers & Suppliers of ASTM A182 F321H SWRF Socket Weld Flange, 1/2\" ASME B16.5 Class 900# Socket Weld Flanges, ASME SA182 F321H Stainless Steel SWRF Socket Weld Flanges, ANSI B16.5 SWRF, DIN 1.4878 Socket Weld Flange, Japanese JIS SUS 321H, UNS S32109 SWRF Flange, EN X12CrNiTi18-9.