... , ASME, JIS, DIN, GB,BSMaterial:Carbon steel,Alloy steel , Stainless steelType:Blind flange, slip-on flange,welding neck flange,thread flange, socket welding flange,,,,,,QuliticationISO, CE, APISurface ... :Prtroleum, chemical, power, gas,metallurgy,constructionSpecial design available as requirement blind flange