Quenched And Tempered SAE-AISI 4130 vs. Quenched And Tempered SAE-AISI 4140
Both quenched and tempered SAE-AISI 4130 and quenched and tempered SAE-AISI 4140 are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical.
For each property being compared, the top bar is quenched and tempered SAE-AISI 4130 and the bottom bar is quenched and tempered SAE-AISI 4140.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 300 | |
| 310 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 18 | |
| 16 |
| Fatigue Strength, MPa | 660 | |
| 650 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 640 | |
| 660 |
| Tensile Strength: Ultimate (UTS), MPa | 1040 | |
| 1080 |
| Tensile Strength: Yield (Proof), MPa | 980 | |
| 990 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 420 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 43 | |
| 43 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 2.4 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 20 | |
| 20 |
| Embodied Water, L/kg | 50 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 180 | |
| 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2550 | |
| 2590 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 37 | |
| 38 |
| Strength to Weight: Bending, points | 29 | |
| 30 |
| Thermal Diffusivity, mm2/s | 12 | |
| 12 |
| Thermal Shock Resistance, points | 31 | |
| 32 |
Alloy Composition
| Carbon (C), % | 0.28 to 0.33 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 0.8 to 1.1 |
| Iron (Fe), % | 97.3 to 98.2 | |
| 96.8 to 97.8 |
| Manganese (Mn), % | 0.4 to 0.6 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0.15 to 0.25 |
| 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 |