... to ANSI/ASME,JIS,DIN,BS,UNI,AS2129,EN1092,GB,HG,SH,SHJ,SGJ international standard.ANSI standard :ANSI b16.5 ... 2276,2277,6083,2280,2283 and so onGB standard : GB,HG,SH,SHJ,SGJMaterial: carbon steel,stainless steel ,alloy steel ASTM ... :SOP,SOH,WELDING NECK,SLIP ON,BLIND Rf and So flange