... Flange, Slip on Flange, Threaded Flange, Socket Welding Flange, Blind Flange, Orifice Flange, Ring Joint Flanges, Long Welding Neck Flange and etc. according to standard ANSI, DIN, ASTM,JIS ... B; DIN GG10,GG15,GG20,GG25,GG30,GG35; JIS FC10,FC15,FC20,FC25,FC30,FC35; BS Grade 150 ... SCCrM3, G35CrMo4,etc.; According to specification ASTM, DIN, JIS, BS, NF,ISO etc..Technical process includes green sand ...