EN 1.7139 +H Steel vs. EN 1.8151 +H Steel
Both EN 1.7139 +H steel and EN 1.8151 +H steel are iron alloys. Both are furnished in the hardened (H) condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.7139 +H steel and the bottom bar is EN 1.8151 +H steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Rockwell C Hardness | 43 | |
| 60 |
| Shear Modulus, GPa | 73 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 1390 | |
| 1940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 270 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 410 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 44 | |
| 50 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.2 | |
| 2.2 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.8 |
| Embodied Energy, MJ/kg | 19 | |
| 25 |
| Embodied Water, L/kg | 51 | |
| 49 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 49 | |
| 70 |
| Strength to Weight: Bending, points | 35 | |
| 45 |
| Thermal Diffusivity, mm2/s | 12 | |
| 14 |
| Thermal Shock Resistance, points | 41 | |
| 58 |
Alloy Composition
| Carbon (C), % | 0.14 to 0.19 | |
| 0.4 to 0.5 |
| Chromium (Cr), % | 0.8 to 1.1 | |
| 0.4 to 0.8 |
| Copper (Cu), % | 0 to 0.25 | |
| 0 |
| Iron (Fe), % | 96.8 to 98 | |
| 95.9 to 97.2 |
| Manganese (Mn), % | 1.0 to 1.3 | |
| 0.6 to 0.9 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 0.3 | |
| 1.3 to 1.7 |
| Sulfur (S), % | 0.020 to 0.040 | |
| 0 to 0.025 |
| Vanadium (V), % | 0 | |
| 0.1 to 0.2 |