ASTM A203 Steel vs. SAE-AISI 4340 Steel
Both ASTM A203 steel and SAE-AISI 4340 steel are iron alloys.
For each property being compared, the top bar is ASTM A203 steel and the bottom bar is SAE-AISI 4340 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 180 | |
| 210 to 360 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 22 to 26 | |
| 12 to 22 |
| Fatigue Strength, MPa | 210 to 280 | |
| 330 to 740 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 330 to 370 | |
| 430 to 770 |
| Tensile Strength: Ultimate (UTS), MPa | 520 to 590 | |
| 690 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 290 to 390 | |
| 470 to 1150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 430 |
| 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 | 52 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 to 7.6 | |
| 7.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 to 8.7 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.2 to 4.0 | |
| 3.5 |
| Density, g/cm3 | 7.9 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.6 to 1.7 | |
| 1.7 |
| Embodied Energy, MJ/kg | 21 to 23 | |
| 22 |
| Embodied Water, L/kg | 50 to 52 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 120 | |
| 79 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 230 to 410 | |
| 590 to 3490 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 21 | |
| 24 to 45 |
| Strength to Weight: Bending, points | 18 to 20 | |
| 22 to 33 |
| Thermal Diffusivity, mm2/s | 14 | |
| 12 |
| Thermal Shock Resistance, points | 15 to 17 | |
| 20 to 38 |