... , companion flange and so on. Facing method: rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization ... 1.Standard:ANSI,ASTM,ASME,DIN,GB2.Material:carbon steel,stainless steel and alloy steel3.OD:685mm ,thickness153mm,R12mm4.:Techniques ... pipe line; easy to seal pipe line 12.Application area: oil, chemical industry, nuclear power station, food manufacturing, construction, ...