Manufacturers & Suppliers of ASTM B462 Alloy 20 SWRF Socket Weld Flange, 3/4\" ASME B16.5 Class 900# Socket Weld Flanges, ASME SB462 20 Alloy SWRF Socket Weld Flanges, ANSI B16.5 SWRF, DIN 2.4660 Socket Weld Flange, AFNOR Z2NCUD31-20AZ, UNS N08020 SWRF Flange, EN NiCr20CuMo.