EN 1.3956 Stainless Steel vs. SAE-AISI 4340 Steel
Both EN 1.3956 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 61% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is EN 1.3956 stainless steel and the bottom bar is SAE-AISI 4340 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 27 | |
| 12 to 22 |
| Fatigue Strength, MPa | 240 | |
| 330 to 740 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 79 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 650 | |
| 690 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 330 | |
| 470 to 1150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 1080 | |
| 430 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1460 |
| Melting Onset (Solidus), °C | 1380 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 22 | |
| 3.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 4.8 | |
| 1.7 |
| Embodied Energy, MJ/kg | 68 | |
| 22 |
| Embodied Water, L/kg | 180 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 150 | |
| 79 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 270 | |
| 590 to 3490 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 23 | |
| 24 to 45 |
| Strength to Weight: Bending, points | 21 | |
| 22 to 33 |
| Thermal Shock Resistance, points | 18 | |
| 20 to 38 |
Alloy Composition
| Carbon (C), % | 0 to 0.060 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 20.5 to 23.5 | |
| 0.7 to 0.9 |
| Iron (Fe), % | 51.9 to 62.1 | |
| 95.1 to 96.3 |
| Manganese (Mn), % | 4.0 to 6.0 | |
| 0.6 to 0.8 |
| Molybdenum (Mo), % | 1.5 to 3.0 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 11.5 to 13.5 | |
| 1.7 to 2.0 |
| Niobium (Nb), % | 0.1 to 0.3 | |
| 0 |
| Nitrogen (N), % | 0.2 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |
| Vanadium (V), % | 0.1 to 0.3 | |
| 0 |