... API, DIN, BS, AS, JIS, JPI socket welding flange ansi b 16.5 1.certificate:ISO9001,ABS,BV 2 ... flange,socket weld flange, carbon steel flange,stainless stel flange,butt welding flanges,forged weld flange,3000lb forged flange,a105 pn16 forged flange,socket weld flange,socket welding flange ... ring joints face (RJ)Standard: HG20592, ASME16.5-2009, DIN2633, ANSI, JIS,BS4504 etc.Material: 195,Q235,20II,16Mn, ...