We are offering duplex flange. Duplex flanges, duplex steel, super duplex flange, special flange, f 44, f 45, f51, f 53, f 55, f 60, f 61 flange, reducing etc. Detailed description duplex flange we offer duplex flanges as per the following specifications: standard: astm / asme a/sa 182 grade: f 44, f 45, f51, f 53, f 55, f 60, f 61. Types: reducing flanges, blind flanges, plate flanges, screwed flanges, weld neck flanges, stainless steel flanges, slip on flanges, socket weld flanges, lap joint flanges.