EN 1.7710 Steel vs. EN 1.7725 Steel
Both EN 1.7710 steel and EN 1.7725 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is EN 1.7710 steel and the bottom bar is EN 1.7725 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 to 320 | |
| 250 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 6.8 to 11 | |
| 14 |
| Fatigue Strength, MPa | 500 to 620 | |
| 390 to 550 |
| Impact Strength: V-Notched Charpy, J | 30 | |
| 34 to 35 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1070 | |
| 830 to 1000 |
| Tensile Strength: Yield (Proof), MPa | 800 to 1060 | |
| 610 to 860 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 440 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1430 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 2.9 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 1.8 |
| Embodied Energy, MJ/kg | 30 | |
| 24 |
| Embodied Water, L/kg | 57 | |
| 54 |
Common Calculations
| PREN (Pitting Resistance) | 4.5 | |
| 2.8 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 73 to 100 | |
| 110 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1680 to 2970 | |
| 980 to 1940 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 33 to 38 | |
| 29 to 35 |
| Strength to Weight: Bending, points | 27 to 30 | |
| 25 to 28 |
| Thermal Diffusivity, mm2/s | 11 | |
| 11 |
| Thermal Shock Resistance, points | 27 to 31 | |
| 24 to 29 |
Alloy Composition
| Carbon (C), % | 0.12 to 0.18 | |
| 0.27 to 0.34 |
| Chromium (Cr), % | 1.3 to 1.8 | |
| 1.3 to 1.7 |
| Iron (Fe), % | 95.1 to 97 | |
| 95.7 to 97.5 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.8 to 1.0 | |
| 0.3 to 0.5 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Vanadium (V), % | 0.15 to 0.25 | |
| 0.050 to 0.15 |