... 100mm~4800mm 3) Height:45mm~650mm 4) steel flange Forging steel flange1) Dimension RANGEouter Diameter350mm~5000mmInner Diameter100mm~4800mmHeight45mm~ ... AISI 1045, GrD( Q235), Gr50 ( Q 345)Alloy Steel: AISI 1053, AISI A387Cr.12, 20CrMo, AISI 4137, ... AISI 4140, AISI 4340, AISI 431, 20 CrMnMoStainless steel: ASTM 304, ASTM 304L, ASTM 316, ASTM 316LAny ... YOU AS FAR AS WE CAN. forged steel flange