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