EN 1.6958 Steel vs. EN 1.6781 Steel
Both EN 1.6958 steel and EN 1.6781 steel are iron alloys. Both are furnished in the quenched and tempered condition. Their average alloy composition is basically identical. There are 31 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is EN 1.6958 steel and the bottom bar is EN 1.6781 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 340 | |
| 250 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 16 | |
| 17 |
| Fatigue Strength, MPa | 700 | |
| 450 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1140 | |
| 830 |
| Tensile Strength: Yield (Proof), MPa | 1070 | |
| 680 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 260 |
| Maximum Temperature: Mechanical, °C | 450 | |
| 450 |
| 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 | 47 | |
| 44 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.9 | |
| 7.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 9.1 | |
| 9.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 5.0 | |
| 5.0 |
| Density, g/cm3 | 7.9 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.0 | |
| 1.9 |
| Embodied Energy, MJ/kg | 27 | |
| 25 |
| Embodied Water, L/kg | 60 | |
| 60 |
Common Calculations
| PREN (Pitting Resistance) | 2.9 | |
| 3.3 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 180 | |
| 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 3050 | |
| 1220 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 40 | |
| 29 |
| Strength to Weight: Bending, points | 31 | |
| 25 |
| Thermal Diffusivity, mm2/s | 13 | |
| 12 |
| Thermal Shock Resistance, points | 39 | |
| 24 |
Alloy Composition
| Aluminum (Al), % | 0.0050 to 0.050 | |
| 0 |
| Carbon (C), % | 0.25 to 0.3 | |
| 0.15 to 0.19 |
| Chromium (Cr), % | 1.2 to 1.7 | |
| 1.3 to 1.8 |
| Iron (Fe), % | 92.6 to 94.5 | |
| 92.6 to 94.6 |
| Manganese (Mn), % | 0.2 to 0.5 | |
| 0.55 to 0.8 |
| Molybdenum (Mo), % | 0.35 to 0.55 | |
| 0.45 to 0.6 |
| Nickel (Ni), % | 3.3 to 3.8 | |
| 3.0 to 3.5 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.015 |
| Silicon (Si), % | 0.15 to 0.3 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |
| Vanadium (V), % | 0 to 0.12 | |
| 0 |