EN 1.4371 Stainless Steel vs. SAE-AISI 4340M Steel
Both EN 1.4371 stainless steel and SAE-AISI 4340M 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 EN 1.4371 stainless steel and the bottom bar is SAE-AISI 4340M steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 to 230 | |
| 710 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 45 to 51 | |
| 6.0 |
| Fatigue Strength, MPa | 290 to 340 | |
| 690 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 72 |
| Shear Strength, MPa | 520 to 540 | |
| 1360 |
| Tensile Strength: Ultimate (UTS), MPa | 740 to 750 | |
| 2340 |
| Tensile Strength: Yield (Proof), MPa | 320 to 340 | |
| 1240 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 880 | |
| 430 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1440 |
| Melting Onset (Solidus), °C | 1370 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 15 | |
| 38 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.5 | |
| 7.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.9 | |
| 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 3.9 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 1.9 |
| Embodied Energy, MJ/kg | 38 | |
| 26 |
| Embodied Water, L/kg | 140 | |
| 55 |
Common Calculations
| PREN (Pitting Resistance) | 20 | |
| 2.2 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 270 to 310 | |
| 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 250 to 300 | |
| 4120 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 27 | |
| 84 |
| Strength to Weight: Bending, points | 24 | |
| 51 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 10 |
| Thermal Shock Resistance, points | 16 | |
| 70 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 16 to 17.5 | |
| 0.7 to 1.0 |
| Copper (Cu), % | 0 to 1.0 | |
| 0 |
| Iron (Fe), % | 66.7 to 74.4 | |
| 93.3 to 94.8 |
| Manganese (Mn), % | 6.0 to 8.0 | |
| 0.65 to 0.9 |
| Molybdenum (Mo), % | 0 | |
| 0.35 to 0.45 |
| Nickel (Ni), % | 3.5 to 5.5 | |
| 1.7 to 2.0 |
| Nitrogen (N), % | 0.15 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.012 |
| Silicon (Si), % | 0 to 1.0 | |
| 1.5 to 1.8 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.012 |
| Vanadium (V), % | 0 | |
| 0.050 to 0.1 |