... 47pressure: 150lb, 300lb, 400lb, 600lb,900lb, 1500lb,2500lbmaterial: ASTM A105, A105N, A350, LF2, LF3, Q235, 20#, 45#, ... 20Mn. 16Mn,Q345, etc.face: RF, FFsurface treatment: black painting, anti-rust varnish, anti-rust ... construction, etc.other types of flange: WN flange, blind flange, plate flange, socket weld flange, threaded flange, ring joint flange, etc. OEM to special requirement ...