Annealed SAE-AISI 4340 vs. SAE-AISI 1095 Steel
Both annealed SAE-AISI 4340 and SAE-AISI 1095 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is annealed SAE-AISI 4340 and the bottom bar is SAE-AISI 1095 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 200 to 270 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 22 | |
| 10 to 11 |
| Fatigue Strength, MPa | 330 | |
| 310 to 370 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Shear Strength, MPa | 430 | |
| 400 to 540 |
| Tensile Strength: Ultimate (UTS), MPa | 690 | |
| 680 to 900 |
| Tensile Strength: Yield (Proof), MPa | 470 | |
| 500 to 590 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 240 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 400 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 44 | |
| 47 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 9.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 1.4 |
| Embodied Energy, MJ/kg | 22 | |
| 19 |
| Embodied Water, L/kg | 53 | |
| 45 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 | |
| 63 to 84 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 590 | |
| 660 to 930 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 24 | |
| 24 to 32 |
| Strength to Weight: Bending, points | 22 | |
| 22 to 26 |
| Thermal Diffusivity, mm2/s | 12 | |
| 13 |
| Thermal Shock Resistance, points | 20 | |
| 22 to 29 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.9 to 1.0 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 0 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 98.4 to 98.8 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0.3 to 0.5 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.050 |