carbon steel high-neck Flange 1, ASTM A 234 WPB 2 , 90% ... , 90% PRODUCTS ARE EXPORTED OVERSEASType: welding neck, slip-on, threaded, lap-joint, socket welding and blindManufacturing standards: API, ANSI, BS, JIS, UNI ... , F304L, F316, F316L, A234 WPB,WPC,WP5,WP11,WP22,WP91 carbon steel high-neck Flange