EN 1.7725 Steel vs. EN 1.6570 Steel
Both EN 1.7725 steel and EN 1.6570 steel are iron alloys. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.7725 steel and the bottom bar is EN 1.6570 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 250 to 300 | |
| 270 to 340 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 11 to 17 |
| Fatigue Strength, MPa | 390 to 550 | |
| 500 to 660 |
| Impact Strength: V-Notched Charpy, J | 34 to 35 | |
| 40 to 48 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 830 to 1000 | |
| 910 to 1130 |
| Tensile Strength: Yield (Proof), MPa | 610 to 860 | |
| 760 to 1060 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 440 |
| 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 | 39 | |
| 40 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.9 | |
| 3.9 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 1.7 |
| Embodied Energy, MJ/kg | 24 | |
| 23 |
| Embodied Water, L/kg | 54 | |
| 56 |
Common Calculations
| PREN (Pitting Resistance) | 2.8 | |
| 2.5 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 130 | |
| 120 to 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 980 to 1940 | |
| 1520 to 3010 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 29 to 35 | |
| 32 to 40 |
| Strength to Weight: Bending, points | 25 to 28 | |
| 27 to 31 |
| Thermal Diffusivity, mm2/s | 11 | |
| 11 |
| Thermal Shock Resistance, points | 24 to 29 | |
| 27 to 33 |
Alloy Composition
| Carbon (C), % | 0.27 to 0.34 | |
| 0.28 to 0.35 |
| Chromium (Cr), % | 1.3 to 1.7 | |
| 1.0 to 1.4 |
| Iron (Fe), % | 95.7 to 97.5 | |
| 94 to 96.2 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.3 to 0.5 | |
| 0.3 to 0.5 |
| Nickel (Ni), % | 0 | |
| 1.6 to 2.1 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Vanadium (V), % | 0.050 to 0.15 | |
| 0 |