SAE-AISI 4340 Steel vs. EN 1.4310 Stainless Steel
Both SAE-AISI 4340 steel and EN 1.4310 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is EN 1.4310 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 360 | |
| 200 to 270 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 to 22 | |
| 14 to 45 |
| Fatigue Strength, MPa | 330 to 740 | |
| 240 to 330 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Shear Strength, MPa | 430 to 770 | |
| 510 to 550 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 730 to 900 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1150 | |
| 260 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 910 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1420 |
| Melting Onset (Solidus), °C | 1420 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 44 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 18 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 2.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 2.7 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 14 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 2.9 |
| Embodied Energy, MJ/kg | 22 | |
| 42 |
| Embodied Water, L/kg | 53 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 79 to 170 | |
| 110 to 260 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 3490 | |
| 170 to 830 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 26 to 32 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 23 to 27 |
| Thermal Diffusivity, mm2/s | 12 | |
| 4.0 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 15 to 18 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 16 to 19 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 66.4 to 78 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 to 0.8 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 6.0 to 9.5 |
| Nitrogen (N), % | 0 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.045 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.015 |