SAE-AISI 4140 Steel vs. ASTM A387 Grade 9 Steel
Both SAE-AISI 4140 steel and ASTM A387 grade 9 steel are iron alloys. They have a moderately high 91% 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 SAE-AISI 4140 steel and the bottom bar is ASTM A387 grade 9 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 310 | |
| 150 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 26 | |
| 20 to 21 |
| Fatigue Strength, MPa | 360 to 650 | |
| 160 to 240 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 75 |
| Shear Strength, MPa | 410 to 660 | |
| 310 to 380 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1080 | |
| 500 to 600 |
| Tensile Strength: Yield (Proof), MPa | 590 to 990 | |
| 230 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 600 |
| 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 | 43 | |
| 26 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 9.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 6.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 2.1 |
| Embodied Energy, MJ/kg | 20 | |
| 28 |
| Embodied Water, L/kg | 51 | |
| 87 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 74 to 180 | |
| 83 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 920 to 2590 | |
| 140 to 310 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 25 to 38 | |
| 18 to 21 |
| Strength to Weight: Bending, points | 22 to 30 | |
| 18 to 20 |
| Thermal Diffusivity, mm2/s | 12 | |
| 6.9 |
| Thermal Shock Resistance, points | 20 to 32 | |
| 14 to 17 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 8.0 to 10 |
| Iron (Fe), % | 96.8 to 97.8 | |
| 87.1 to 90.8 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 0.15 to 0.25 | |
| 0.9 to 1.1 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.025 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.025 |
| Vanadium (V), % | 0 | |
| 0 to 0.040 |