Manufacturers & Suppliers of ASTM A694 F65 Carbon Steel WNRF Weldneck Flange Series B, 50\" ASME B16.47 Class 900# Weldneck Flanges Series B, ASME SA694 F65 CS WNRF Welding Neck Flanges Series B, ANSI B16.5 WNRF, High Quality Yield F65 Welding Flange.