... BS,UNI,AS2129,EN1092,GB,HG,SH,SHJ,SGJ international standard.ANSI standard :ANSI b16.5,16.36,16.47,16.48,MSS SP44DIN ... standard: DIN2527,2566,2573,2641,2642,2638,2655 etc.JIS ... 2280,2283 and so onGB standard : GB,HG,SH,SHJ,SGJMaterial: carbon steel,stainless steel ,alloy steel ASTM A 105, A182, Q235 ... SOP,SOH,WELDING NECK,SLIP ON,BLIND Rf and So flange