... 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 ... ,S32750,HDRCopper Nickel Alloy:B10,B30Special steel:N06600,N08800,N08811,Titanium alloy, Alloy steel etc.Carbon manganese steel:20# / ... ,Drilling and Passivating high quality Stainless steel flange, 150~1500class