... .Standard:ANSI B16.5,DIN2573,JIS 5K,GB etc. 2.Material:Cr25Ni35,HK40,steel 3.ISO9001:2008 Flange is ... standard, will not repeat. 2) American Flange System: U.S. ANSI B16.5 3) The flange structure: Integral flange Unit flange a, threaded flange b, welding flange, welding neck flange, welding neck flange, socket weld flange with neck , slipon plate flange c, Loose flange ...