Manufacturers & Suppliers of ASTM A694 F60 Carbon Steel WNRF Weldneck Flange Series B, 54\" ASME B16.47 Class 300# Weldneck Flanges Series B, ASME SA694 F60 CS WNRF Welding Neck Flanges Series B, ANSI B16.5 WNRF, High Quality Yield F60 Welding Flange.