... A350, LF2, LF3, Q235, 20#, 45#, 20Mn. 16Mn,Q345, etc.face: RF, FFsurface treatment: black painting, anti-rust varnish, ... oil,hot-galvanized, cold-galvanized, 3PE coating, epoxy coating, etc.package: plywood caseuse: petroleum, gas, chemical, metallurgy, electric ... station, shipbuilding, construction, etc.other types of flange: WN flange, blind flange, plate ...