hubbed flange Slip On flange welded neck flange, hubbed flange Tread flange,Blind flange socket welding flange hubbed flange Material : 1. Carbon Steel :ASTM A105,20, Q235, ... F50, F52, F56, F60, F65, F70. 2.Stainess Steel: ASTM A182, F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8 ... . SS201 3.Alloy Steel: ASTM A182 F1, F5a, F9,F11, F12, F22, F91, A182F12, ...