large diameter flange: 1.Size:1/2"-48" 2.Material:carbon ... steel and alloy steel 3.Standard:ASME,DIN,JIS,GB large diameter flange:Flange TypeNominalDiameterNominalpressureManufacturestandardSlip-on welding platesteel pipe flangeDN10-DN25000 ... .25Mpa-42.0MpaGB/T9123.1-4-2000HG20601-97ANSI B16.5 large diameter flange