SAE-AISI 4340M Steel vs. N08031 Stainless Steel
Both SAE-AISI 4340M steel and N08031 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is N08031 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 6.0 | |
| 45 |
| Fatigue Strength, MPa | 690 | |
| 290 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 81 |
| Shear Strength, MPa | 1360 | |
| 510 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 730 |
| Tensile Strength: Yield (Proof), MPa | 1240 | |
| 310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 310 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1440 |
| Melting Onset (Solidus), °C | 1400 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 460 |
| Thermal Conductivity, W/m-K | 38 | |
| 12 |
| Thermal Expansion, µm/m-K | 13 | |
| 18 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 39 |
| Density, g/cm3 | 7.8 | |
| 8.1 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 7.1 |
| Embodied Energy, MJ/kg | 26 | |
| 96 |
| Embodied Water, L/kg | 55 | |
| 240 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 52 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 270 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 4120 | |
| 230 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 84 | |
| 25 |
| Strength to Weight: Bending, points | 51 | |
| 22 |
| Thermal Diffusivity, mm2/s | 10 | |
| 3.1 |
| Thermal Shock Resistance, points | 70 | |
| 14 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.015 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 26 to 28 |
| Copper (Cu), % | 0 | |
| 1.0 to 1.4 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 29 to 36.9 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 6.0 to 7.0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 30 to 32 |
| Nitrogen (N), % | 0 | |
| 0.15 to 0.25 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.020 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 0.3 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.010 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0 |