SAE-AISI 4340 Steel vs. S45000 Stainless Steel
Both SAE-AISI 4340 steel and S45000 stainless steel are iron alloys. They have 79% of their average alloy composition in common. There are 31 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 4340 steel and the bottom bar is S45000 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 360 | |
| 280 to 410 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 to 22 | |
| 6.8 to 14 |
| Fatigue Strength, MPa | 330 to 740 | |
| 330 to 650 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 76 |
| Shear Strength, MPa | 430 to 770 | |
| 590 to 830 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 980 to 1410 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1150 | |
| 580 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 840 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 44 | |
| 17 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 13 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 2.8 |
| Embodied Energy, MJ/kg | 22 | |
| 39 |
| Embodied Water, L/kg | 53 | |
| 130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 79 to 170 | |
| 94 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 to 3490 | |
| 850 to 4400 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 35 to 50 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 28 to 36 |
| Thermal Diffusivity, mm2/s | 12 | |
| 4.5 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 33 to 47 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.050 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 14 to 16 |
| Copper (Cu), % | 0 | |
| 1.3 to 1.8 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 72.1 to 79.3 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0.5 to 1.0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 5.0 to 7.0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |