SAE-AISI 1144 Steel vs. SAE-AISI 1151 Steel
Both SAE-AISI 1144 steel and SAE-AISI 1151 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is SAE-AISI 1144 steel and the bottom bar is SAE-AISI 1151 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 to 230 | |
| 210 to 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 17 | |
| 11 to 17 |
| Fatigue Strength, MPa | 280 to 430 | |
| 260 to 410 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 34 to 40 | |
| 34 to 40 |
| Shear Modulus, GPa | 72 | |
| 72 |
| Shear Strength, MPa | 460 to 510 | |
| 430 to 480 |
| Tensile Strength: Ultimate (UTS), MPa | 750 to 840 | |
| 710 to 800 |
| Tensile Strength: Yield (Proof), MPa | 420 to 690 | |
| 390 to 660 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 400 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 51 | |
| 51 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 10 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.2 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.9 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.4 |
| Embodied Energy, MJ/kg | 19 | |
| 18 |
| Embodied Water, L/kg | 47 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 91 to 110 | |
| 86 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 480 to 1290 | |
| 400 to 1170 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 27 to 30 | |
| 25 to 28 |
| Strength to Weight: Bending, points | 23 to 25 | |
| 22 to 24 |
| Thermal Diffusivity, mm2/s | 14 | |
| 14 |
| Thermal Shock Resistance, points | 22 to 24 | |
| 22 to 25 |
Alloy Composition
| Carbon (C), % | 0.4 to 0.48 | |
| 0.48 to 0.55 |
| Iron (Fe), % | 97.5 to 98 | |
| 98.3 to 98.7 |
| Manganese (Mn), % | 1.4 to 1.7 | |
| 0.7 to 1.0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Sulfur (S), % | 0.24 to 0.33 | |
| 0.080 to 0.13 |