ANSI B16.36 Orifice Flanges Wide range of materials, including ASTM A 1 05N Carbon Steel. ASTM A350 LF2 Carbon Steel ASTM A182 F316L Stainless Steel Ratings from 300 Ib to 2500 Ib Sizes from 1" Nominal Bore Corner Tapping Versions Available . Harvest Business can supply orifice flanges in a wide range of standard and special materials, including: ASTM A 105 Carbon Steel ASTM A350 LF2 Low Temp Carbon Steel ASTM A182 F316 Stainless Steel ASTM A 182 F304 Stainless Steel ASTM A182 F11 1% Cr 1!z% Mo ASTM A182 F22 2%% Cr 1% Mo. Pakcing in plywood case.