SAE-AISI 4340M Steel vs. ASTM Grade HN Steel
Both SAE-AISI 4340M steel and ASTM grade HN steel are iron alloys. They have 56% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 4340M steel and the bottom bar is ASTM grade HN steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 710 | |
| 140 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 6.0 | |
| 9.0 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 2340 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 310 |
| Maximum Temperature: Mechanical, °C | 430 | |
| 1080 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1400 |
| Melting Onset (Solidus), °C | 1400 | |
| 1350 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 480 |
| Thermal Conductivity, W/m-K | 38 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 16 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.9 | |
| 26 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 4.6 |
| Embodied Energy, MJ/kg | 26 | |
| 66 |
| Embodied Water, L/kg | 55 | |
| 180 |
Common Calculations
| PREN (Pitting Resistance) | 2.2 | |
| 22 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 25 |
| Strength to Weight: Axial, points | 84 | |
| 17 |
| Strength to Weight: Bending, points | 51 | |
| 18 |
| Thermal Diffusivity, mm2/s | 10 | |
| 3.5 |
| Thermal Shock Resistance, points | 70 | |
| 11 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0.2 to 0.5 |
| Chromium (Cr), % | 0.7 to 1.0 | |
| 19 to 23 |
| Iron (Fe), % | 93.3 to 94.8 | |
| 44.9 to 57.8 |
| Manganese (Mn), % | 0.65 to 0.9 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0.35 to 0.45 | |
| 0 to 0.5 |
| Nickel (Ni), % | 1.7 to 2.0 | |
| 23 to 27 |
| Phosphorus (P), % | 0 to 0.012 | |
| 0 to 0.040 |
| Silicon (Si), % | 1.5 to 1.8 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 to 0.012 | |
| 0 to 0.040 |
| Vanadium (V), % | 0.050 to 0.1 | |
| 0 |