SAE-AISI 1140 Steel vs. S81921 Stainless Steel
Both SAE-AISI 1140 steel and S81921 stainless steel are iron alloys. They have 72% 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 1140 steel and the bottom bar is S81921 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 180 | |
| 260 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 14 to 18 | |
| 29 |
| Fatigue Strength, MPa | 230 to 370 | |
| 370 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 79 |
| Shear Strength, MPa | 370 to 420 | |
| 460 |
| Tensile Strength: Ultimate (UTS), MPa | 600 to 700 | |
| 710 |
| Tensile Strength: Yield (Proof), MPa | 340 to 570 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 990 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1430 |
| Melting Onset (Solidus), °C | 1420 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 51 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.0 | |
| 2.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.1 | |
| 2.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 14 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 2.9 |
| Embodied Energy, MJ/kg | 18 | |
| 41 |
| Embodied Water, L/kg | 46 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 89 to 93 | |
| 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 310 to 870 | |
| 630 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 21 to 25 | |
| 25 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 23 |
| Thermal Diffusivity, mm2/s | 14 | |
| 4.0 |
| Thermal Shock Resistance, points | 18 to 21 | |
| 20 |
Alloy Composition
| Carbon (C), % | 0.37 to 0.44 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0 | |
| 19 to 22 |
| Iron (Fe), % | 98.4 to 98.9 | |
| 66.7 to 75.9 |
| Manganese (Mn), % | 0.7 to 1.0 | |
| 2.0 to 4.0 |
| Molybdenum (Mo), % | 0 | |
| 1.0 to 2.0 |
| Nickel (Ni), % | 0 | |
| 2.0 to 4.0 |
| Nitrogen (N), % | 0 | |
| 0.14 to 0.2 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0.080 to 0.13 | |
| 0 to 0.030 |