Size : 1/8" NB TO 48"NB. Alloy Steel : ASTM A 182, GR F1, F5, F6, F9, ... flanges/ Blank flanges Material Specifications: Carbon Steel : ASTM A 105, A 266 Alloy Steel : ASTM A 182, GR F1, F5 ... ,321,321H, 316Ti,316H,316L, 347,347H, Duplex Steel , UNS S 31803, 2205 , Super Duplex Steel , UNS S 32750Nickel Alloys : Monel 400 & ... 57636.57688.936.576143.764144.526128.27-- stainless steel forge 904l flange