... Flange, Welding Neck Flange, Socket Welding Flange, Threaded Flange, Lap Joint Flange, Blind Flange and other kinds of special flanges.Standard:America:ASME B16.5,ASME B16.48,ASME B16 ... CB1001-81,CBM1013-81,CBM1018-81,CBT47-1999Industry Standard:JB/T74-1994,JB4700-4707-2000,JB/ ... ,HDRCopper Nickel Alloy:B10,B30Special steel:N06600,N08800,N08811,Titanium alloy, Alloy steel etc.Carbon manganese steel:20# ...