SAE-AISI 8740 Steel vs. N08020 Stainless Steel
Both SAE-AISI 8740 steel and N08020 stainless steel are iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is N08020 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 11 to 23 | |
| 15 to 34 |
| Fatigue Strength, MPa | 270 to 350 | |
| 210 to 240 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Shear Strength, MPa | 370 to 400 | |
| 380 to 410 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
| 610 to 620 |
| Tensile Strength: Yield (Proof), MPa | 380 to 570 | |
| 270 to 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1410 |
| Melting Onset (Solidus), °C | 1420 | |
| 1360 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 460 |
| Thermal Conductivity, W/m-K | 39 | |
| 12 |
| Thermal Expansion, µm/m-K | 13 | |
| 15 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 1.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 1.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 38 |
| Density, g/cm3 | 7.8 | |
| 8.2 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 6.6 |
| Embodied Energy, MJ/kg | 20 | |
| 92 |
| Embodied Water, L/kg | 50 | |
| 220 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 120 | |
| 83 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 to 850 | |
| 180 to 440 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 20 to 24 | |
| 21 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 20 |
| Thermal Diffusivity, mm2/s | 10 | |
| 3.2 |
| Thermal Shock Resistance, points | 17 to 20 | |
| 15 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.070 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 19 to 21 |
| Copper (Cu), % | 0 | |
| 3.0 to 4.0 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 29.9 to 44 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 2.0 to 3.0 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 32 to 38 |
| Niobium (Nb), % | 0 | |
| 0 to 1.0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.045 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.035 |