... ,TUV 4.All standard carbon steel pipe flanges1) Product Name:carbon steel pipe flanges2) Type of Flange: SLIP-ON, WELDING NECK, BLIND, ... SOCKET WELDING, THREADED, LAP JOINT3) Size of Flange: 1/2 ... ,SS400, SF440 RST37.2,S235JRG2,P250GH,C22.8 Stainless Steel Flange: F304 F304L F316 F316L 316Ti5) Surface Treatment: Anti-rust ...