Manufacture and export large diameter flange, ASME B16.47A series and ASME B16.47B series, ... size from 26" to 60". Large flange (Large diameter flange)forge steel flange1)Standards: ASME(ANSI)B16.47A2)Size ... ,F1,F5,F11,F22,SS304,SS316,SS304L,SS316L etc. Large diameter flange (ASME B16.47A)