Carbon Steel Flange ASTM A105, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2 ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 Stainless Steel Flange ASTM A182 F304/304L, F316/316L, F316H, F310, F321, F44 (UNS S31254) Alloy Steel Flange ASTM A182 F1, F5a, F9, F11, F12, F22, F91 Chemical Requirements (Composition, %, max) Material Symbol C Mn P S Si Ni Cr Mo Cu N V Co ASTM A105 0.35 0.60-1.05 0.035 0.040 0.10-0.35 0.40 0.30 0.12 0.40 _ 0.08 _ ASTM A350 LF2 0.30 0.60-1.35 0.035 0.040 0.15-0.30 0.40 0.30 0.12 0.40 _ 0.08 0.02 ASTM A182 F304 0.08 2.00 0.045 0.030 1.00 8.0-11.0 18.0-20.0 _ _ _ _ _ ASTM A182 F304L 0.03 2.00 0.045 0.030 1.00 8.0-13.0 18.0-20.0 _ _ _ _ _ ASTM A182 F316 0.08 2.00 0.045 0.030 1.00 10.0-14.0 16.0-18.0 2.00-3.00 _ _ _ _ ASTM A182 F316L 0.03 2.00 0.045 0.030 1.00 10.0-15.0 16.0-18.0 2.00-3.00 _ _ _ _ ASTM A182 F321 0.08 2.00 0.045 0.030 1.00 9.0-12.0 17.0-19.0 _ _ _ _ _ EN 10025 S235JR 0.20 1.40 0.045 0.045 _ _ _ _ _ 0.009 _ _ 20Mn 0.17-0.23 0.70-1.00 0.035 0.035 0.17-0.37 0.30 0.25 0.25 20 0.17-0.23 0.60-1.00 0.030 0.020 0.17-0.37 0.25 0.25 0.25 16Mn 0.13-0.19 1.20-1.60 0.030 0.020 0.20-0.60 0.30 0.30 0.25 Mechanical Requirements Material Symbol Tensile Strength, min, MPa Yield point, min, Mpa Elongation, min, % Reduction of area, min, % Hardness, max, HB Min. Impact Average, J Test Temperature, C ASTM A105 485 250 22 30 187 ASTM A350 LF2 485-655 250 22 30 20 -46 ASTM A182 F304 515 205 30 50 ASTM A182 F304L 485 170 30 50 ASTM A182 F316 515 205 30 50 ASTM A182 F316L 485 170 30 50 ASTM A182 F321 515 205 30 50 20Mn 450 275 24 50 197 20 410 245 25 55 156