... steel, stainless steel Standard:ANSI,ASTM,DIN,JIS,BS Pressure grade:PN2.5-PN40 Punch & stamp ... 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,BS ... ,etc.; According to specification ASTM, DIN, JIS, BS, NF,ISO etc..Technical process includes green sand moulding ...