AISI 440C Stainless Steel vs. Normalized SAE-AISI 4140
Both AISI 440C stainless steel and normalized SAE-AISI 4140 are iron alloys. They have 83% of their average alloy composition in common. There are 29 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 AISI 440C stainless steel and the bottom bar is normalized SAE-AISI 4140.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 2.0 to 14 | |
| 18 |
| Fatigue Strength, MPa | 260 to 840 | |
| 440 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 76 | |
| 73 |
| Shear Strength, MPa | 430 to 1120 | |
| 630 |
| Tensile Strength: Ultimate (UTS), MPa | 710 to 1970 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 450 to 1900 | |
| 660 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 870 | |
| 420 |
| Melting Completion (Liquidus), °C | 1480 | |
| 1460 |
| Melting Onset (Solidus), °C | 1370 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 22 | |
| 43 |
| Thermal Expansion, µm/m-K | 10 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.8 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.0 | |
| 2.4 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 1.5 |
| Embodied Energy, MJ/kg | 31 | |
| 20 |
| Embodied Water, L/kg | 120 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 39 to 88 | |
| 160 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 71 | |
| 36 |
| Strength to Weight: Bending, points | 23 to 46 | |
| 29 |
| Thermal Diffusivity, mm2/s | 6.0 | |
| 12 |
| Thermal Shock Resistance, points | 26 to 71 | |
| 30 |
Alloy Composition
| Carbon (C), % | 1.0 to 1.2 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 16 to 18 | |
| 0.8 to 1.1 |
| Iron (Fe), % | 78 to 83.1 | |
| 96.8 to 97.8 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.75 | |
| 0.15 to 0.25 |
| 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 0.015 | |
| 0 to 0.040 |