ASTM A369 Grade FP21 vs. SAE-AISI 4340M Steel
Both ASTM A369 grade FP21 and SAE-AISI 4340M steel are iron alloys. Both are furnished in the annealed condition. They have a very high 96% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is ASTM A369 grade FP21 and the bottom bar is SAE-AISI 4340M steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 140 | |
| 710 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 20 | |
| 6.0 |
| Fatigue Strength, MPa | 160 | |
| 690 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 74 | |
| 72 |
| Shear Strength, MPa | 300 | |
| 1360 |
| Tensile Strength: Ultimate (UTS), MPa | 470 | |
| 2340 |
| Tensile Strength: Yield (Proof), MPa | 240 | |
| 1240 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 470 | |
| 430 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1440 |
| Melting Onset (Solidus), °C | 1430 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 41 | |
| 38 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.7 | |
| 7.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.8 | |
| 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 4.0 | |
| 3.9 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 1.9 |
| Embodied Energy, MJ/kg | 23 | |
| 26 |
| Embodied Water, L/kg | 61 | |
| 55 |
Common Calculations
| PREN (Pitting Resistance) | 6.2 | |
| 2.2 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 80 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 | |
| 4120 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 17 | |
| 84 |
| Strength to Weight: Bending, points | 17 | |
| 51 |
| Thermal Diffusivity, mm2/s | 11 | |
| 10 |
| Thermal Shock Resistance, points | 14 | |
| 70 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.15 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 2.7 to 3.4 | |
| 0.7 to 1.0 |
| Iron (Fe), % | 94.3 to 96.2 | |
| 93.3 to 94.8 |
| Manganese (Mn), % | 0.3 to 0.6 | |
| 0.65 to 0.9 |
| Molybdenum (Mo), % | 0.8 to 1.1 | |
| 0.35 to 0.45 |
| Nickel (Ni), % | 0 | |
| 1.7 to 2.0 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.012 |
| Silicon (Si), % | 0 to 0.5 | |
| 1.5 to 1.8 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.012 |
| Vanadium (V), % | 0 | |
| 0.050 to 0.1 |