... of flanges such as Welding Neck Flange, Slip on Flange, Threaded Flange, Socket Welding Flange, Blind Flange, Orifice Flange, Ring Joint Flanges, Long Welding ... A182 F304/304L, F316/316L, F316H, F316Ti, F321, F310, F312 Alloy Steel: ASTM A182 F1, F5A , F9, F11, F12, F22 ... etc.; According to specification ASTM, DIN, JIS, BS, NF,ISO etc..Technical process includes green sand moulding, resin sand moulding ...