WELDING NECK FLANGE 1.ANSI JIS DIN EN1092-1 BS4504 ... -48 INCH 4.A105 orC22.8 FL reducing flange is widely used in petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, etcperformed. ... 8 FLANGE... Forged Steel Flanges:(1).ASME/ANSI B16.5 : WELDING NECK FLANGE, SLIP-ON FLANGE, BLIND FLANGE,HIGH HUB BLIND ... .Pressure Class : 150, 300, 400 , 600 , 900, 1500 , 2500 welding neck flange