... 90/10, 70/30 Forged Steel Flanges: ASME/ANSI B16.5: WELDING NECK FLANGE, SLIP-ON FLANGE, BLIND FLANGE ... 300, 400, 600, 900, 1500, 2500 ASME/ANSI B16.47(SERIES A & B): WELDING NECK FLANGE, BLIND FLANGE ... 75, 150, 300, 400, 600, 900 ASME/ANSI B16.36: (ORIFICE FLANGES) WELDING NECK FLANGE, SLIPON FLANGE, ... Class: 300, 400, 600, 900, 1500, 2500 ASTM/ANSI B16.48: ( Figure-8 blanks) Pressure Class: 150, 300, ...