EN 1.4945 Stainless Steel vs. SAE-AISI 4340 Steel
Both EN 1.4945 stainless steel and SAE-AISI 4340 steel are iron alloys. They have 65% 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 EN 1.4945 stainless steel and the bottom bar is SAE-AISI 4340 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 220 | |
| 210 to 360 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 19 to 34 | |
| 12 to 22 |
| Fatigue Strength, MPa | 230 to 350 | |
| 330 to 740 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 73 |
| Shear Strength, MPa | 430 to 460 | |
| 430 to 770 |
| Tensile Strength: Ultimate (UTS), MPa | 640 to 740 | |
| 690 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 290 to 550 | |
| 470 to 1150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 920 | |
| 430 |
| Melting Completion (Liquidus), °C | 1490 | |
| 1460 |
| Melting Onset (Solidus), °C | 1440 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 14 | |
| 44 |
| Thermal Expansion, µm/m-K | 17 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.9 | |
| 7.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.2 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 30 | |
| 3.5 |
| Density, g/cm3 | 8.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 5.0 | |
| 1.7 |
| Embodied Energy, MJ/kg | 73 | |
| 22 |
| Embodied Water, L/kg | 150 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 130 to 180 | |
| 79 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 210 to 760 | |
| 590 to 3490 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 22 to 25 | |
| 24 to 45 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 22 to 33 |
| Thermal Diffusivity, mm2/s | 3.7 | |
| 12 |
| Thermal Shock Resistance, points | 14 to 16 | |
| 20 to 38 |
Alloy Composition
| Carbon (C), % | 0.040 to 0.1 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 15.5 to 17.5 | |
| 0.7 to 0.9 |
| Iron (Fe), % | 57.9 to 65.7 | |
| 95.1 to 96.3 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0.6 to 0.8 |
| Molybdenum (Mo), % | 0 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 15.5 to 17.5 | |
| 1.7 to 2.0 |
| Niobium (Nb), % | 0.4 to 1.2 | |
| 0 |
| Nitrogen (N), % | 0.060 to 0.14 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.3 to 0.6 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.040 |
| Tungsten (W), % | 2.5 to 3.5 | |
| 0 |