SAE-AISI 4340M Steel vs. AISI 201 Stainless Steel
Both SAE-AISI 4340M steel and AISI 201 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 (4, 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 201 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 710 | |
| 200 to 440 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 6.0 | |
| 4.6 to 51 |
| Fatigue Strength, MPa | 690 | |
| 280 to 600 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 77 |
| Shear Strength, MPa | 1360 | |
| 450 to 840 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 650 to 1450 |
| Tensile Strength: Yield (Proof), MPa | 1240 | |
| 300 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 880 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1410 |
| Melting Onset (Solidus), °C | 1400 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 38 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.1 | |
| 2.9 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 12 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 2.6 |
| Embodied Energy, MJ/kg | 26 | |
| 38 |
| Embodied Water, L/kg | 55 | |
| 140 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 19 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 61 to 340 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 4120 | |
| 230 to 2970 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 84 | |
| 23 to 52 |
| Strength to Weight: Bending, points | 51 | |
| 22 to 37 |
| Thermal Diffusivity, mm2/s | 10 | |
| 4.0 |
| Thermal Shock Resistance, points | 70 | |
| 14 to 32 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 16 to 18 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 67.5 to 75 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 5.5 to 7.5 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 3.5 to 5.5 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.060 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.030 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0 |