Manufacturers & Suppliers of ASTM A182 Alloy Steel F12 WNRF Weldneck Flange, 2-1/2\" WNRF Flanges Sch 140, ASME B16.5 Class 150# Weldneck Flange, ASME SA182 AS F12 WNRF Welding Neck Flanges, ANSI B16.5 WNRF, DIN 1.7335 Welding Flange, UNS K11562/K11564 WNRF Flange.