Quenched And Tempered SAE-AISI 4340 vs. Quenched And Tempered SAE-AISI 6150
Both quenched and tempered SAE-AISI 4340 and quenched and tempered SAE-AISI 6150 are iron alloys. Both are furnished in the quenched and tempered condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is quenched and tempered SAE-AISI 4340 and the bottom bar is quenched and tempered SAE-AISI 6150.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 350 | |
| 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 15 |
| Fatigue Strength, MPa | 740 | |
| 750 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 730 | |
| 730 |
| Tensile Strength: Ultimate (UTS), MPa | 1210 | |
| 1200 |
| Tensile Strength: Yield (Proof), MPa | 1150 | |
| 1160 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 420 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 44 | |
| 46 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 2.3 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 2.0 |
| Embodied Energy, MJ/kg | 22 | |
| 28 |
| Embodied Water, L/kg | 53 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 170 | |
| 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3490 | |
| 3590 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 43 | |
| 43 |
| Strength to Weight: Bending, points | 32 | |
| 32 |
| Thermal Diffusivity, mm2/s | 12 | |
| 13 |
| Thermal Shock Resistance, points | 36 | |
| 38 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.48 to 0.53 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 0.8 to 1.1 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 96.7 to 97.7 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0.7 to 0.9 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.040 |
| Vanadium (V), % | 0 | |
| 0.15 to 0.3 |