SAE-AISI 4340M Steel vs. AISI 302 Stainless Steel
Both SAE-AISI 4340M steel and AISI 302 stainless steel are iron alloys. They have 75% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is AISI 302 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 710 | |
| 170 to 440 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 6.0 | |
| 4.5 to 46 |
| Fatigue Strength, MPa | 690 | |
| 210 to 520 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 77 |
| Shear Strength, MPa | 1360 | |
| 400 to 830 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 580 to 1430 |
| Tensile Strength: Yield (Proof), MPa | 1240 | |
| 230 to 1100 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 710 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1420 |
| Melting Onset (Solidus), °C | 1400 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 38 | |
| 16 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.1 | |
| 2.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 15 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 3.0 |
| Embodied Energy, MJ/kg | 26 | |
| 42 |
| Embodied Water, L/kg | 55 | |
| 140 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 19 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 59 to 260 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 4120 | |
| 140 to 3070 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 84 | |
| 21 to 51 |
| Strength to Weight: Bending, points | 51 | |
| 20 to 36 |
| Thermal Diffusivity, mm2/s | 10 | |
| 4.4 |
| Thermal Shock Resistance, points | 70 | |
| 12 to 31 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 17 to 19 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 67.9 to 75 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 8.0 to 10 |
| Nitrogen (N), % | 0 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.045 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.030 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0 |