SAE-AISI 4340M Steel vs. AWS E349
Both SAE-AISI 4340M steel and AWS E349 are iron alloys. They have 70% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is AWS E349.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 6.0 | |
| 29 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 770 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 290 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1470 |
| Melting Onset (Solidus), °C | 1400 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 38 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.8 | |
| 2.1 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.1 | |
| 2.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 25 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 4.9 |
| Embodied Energy, MJ/kg | 26 | |
| 72 |
| Embodied Water, L/kg | 55 | |
| 150 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 24 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 84 | |
| 27 |
| Strength to Weight: Bending, points | 51 | |
| 24 |
| Thermal Diffusivity, mm2/s | 10 | |
| 4.1 |
| Thermal Shock Resistance, points | 70 | |
| 20 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.13 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 18 to 21 |
| Copper (Cu), % | 0 | |
| 0 to 0.75 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 60.5 to 71.1 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 0.5 to 2.5 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 0.35 to 0.65 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 8.0 to 10 |
| Niobium (Nb), % | 0 | |
| 0.75 to 1.2 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.040 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 0 to 0.15 |
| Tungsten (W), % | 0 | |
| 1.3 to 1.8 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0.1 to 0.3 |