SAE-AISI 4140 Steel vs. ASTM A204 Steel
Both SAE-AISI 4140 steel and ASTM A204 steel are iron alloys.
For each property being compared, the top bar is SAE-AISI 4140 steel and the bottom bar is ASTM A204 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 310 | |
| 160 to 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 26 | |
| 18 to 22 |
| Fatigue Strength, MPa | 360 to 650 | |
| 200 to 220 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 410 to 660 | |
| 330 to 360 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1080 | |
| 520 to 590 |
| Tensile Strength: Yield (Proof), MPa | 590 to 990 | |
| 290 to 330 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 410 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 to 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 43 | |
| 52 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 2.4 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 20 | |
| 20 |
| Embodied Water, L/kg | 51 | |
| 47 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 74 to 180 | |
| 90 to 95 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 920 to 2590 | |
| 220 to 290 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| 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 | |
| 14 |
| Thermal Shock Resistance, points | 20 to 32 | |
| 15 to 17 |