SAE-AISI 4145 Steel vs. S35315 Stainless Steel
Both SAE-AISI 4145 steel and S35315 stainless steel are iron alloys. Both are furnished in the annealed condition. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 31 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4145 steel and the bottom bar is S35315 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 310 | |
| 190 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 16 | |
| 46 |
| Fatigue Strength, MPa | 240 | |
| 280 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 78 |
| Shear Strength, MPa | 360 | |
| 520 |
| Tensile Strength: Ultimate (UTS), MPa | 580 | |
| 740 |
| Tensile Strength: Yield (Proof), MPa | 360 | |
| 300 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 330 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1370 |
| Melting Onset (Solidus), °C | 1420 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 42 | |
| 12 |
| Thermal Expansion, µm/m-K | 13 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 1.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 2.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 34 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 5.7 |
| Embodied Energy, MJ/kg | 20 | |
| 81 |
| Embodied Water, L/kg | 51 | |
| 220 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 80 | |
| 270 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 350 | |
| 230 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 | |
| 26 |
| Strength to Weight: Bending, points | 20 | |
| 23 |
| Thermal Diffusivity, mm2/s | 11 | |
| 3.1 |
| Thermal Shock Resistance, points | 17 | |
| 17 |
Alloy Composition
| Carbon (C), % | 0.43 to 0.48 | |
| 0.040 to 0.080 |
| Cerium (Ce), % | 0 | |
| 0.030 to 0.1 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 24 to 26 |
| Iron (Fe), % | 96.7 to 97.7 | |
| 33.6 to 40.6 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 34 to 36 |
| Nitrogen (N), % | 0 | |
| 0.12 to 0.18 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 1.2 to 2.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.030 |