SAE-AISI 4340 Steel vs. AWS BNi-1a
SAE-AISI 4340 steel belongs to the iron alloys classification, while AWS BNi-1a belongs to the nickel alloys. There are 19 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340 steel and the bottom bar is AWS BNi-1a.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 180 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Shear Modulus, GPa | 73 | |
| 70 |
| Tensile Strength: Ultimate (UTS), MPa | 690 to 1280 | |
| 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 370 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1080 |
| Melting Onset (Solidus), °C | 1420 | |
| 980 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 500 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 55 |
| Density, g/cm3 | 7.8 | |
| 8.0 |
| Embodied Carbon, kg CO2/kg material | 1.7 | |
| 8.8 |
| Embodied Energy, MJ/kg | 22 | |
| 120 |
| Embodied Water, L/kg | 53 | |
| 240 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 24 to 45 | |
| 16 |
| Strength to Weight: Bending, points | 22 to 33 | |
| 16 |
| Thermal Shock Resistance, points | 20 to 38 | |
| 15 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.050 |
| Boron (B), % | 0 | |
| 2.8 to 3.5 |
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.060 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 13 to 15 |
| Cobalt (Co), % | 0 | |
| 0 to 0.1 |
| Iron (Fe), % | 95.1 to 96.3 | |
| 4.0 to 5.0 |
| Manganese (Mn), % | 0.6 to 0.8 | |
| 0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 70.6 to 76.3 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.020 |
| Selenium (Se), % | 0 | |
| 0 to 0.0050 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 4.0 to 5.0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.020 |
| Titanium (Ti), % | 0 | |
| 0 to 0.050 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.050 |
| Residuals, % | 0 | |
| 0 to 0.5 |