EN 1.7725 Steel vs. EN 1.6579 Steel
Both EN 1.7725 steel and EN 1.6579 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 1.6579 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 250 to 300 | |
| 260 to 290 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 14 | |
| 11 to 14 |
| Fatigue Strength, MPa | 390 to 550 | |
| 380 to 570 |
| Impact Strength: V-Notched Charpy, J | 34 to 35 | |
| 35 to 41 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 830 to 1000 | |
| 850 to 980 |
| Tensile Strength: Yield (Proof), MPa | 610 to 860 | |
| 600 to 910 |
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 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 39 | |
| 39 |
| 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 | |
| 3.7 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.8 | |
| 1.7 |
| Embodied Energy, MJ/kg | 24 | |
| 22 |
| Embodied Water, L/kg | 54 | |
| 56 |
Common Calculations
| PREN (Pitting Resistance) | 2.8 | |
| 2.4 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 130 | |
| 100 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 980 to 1940 | |
| 950 to 2210 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 29 to 35 | |
| 30 to 35 |
| Strength to Weight: Bending, points | 25 to 28 | |
| 25 to 28 |
| Thermal Diffusivity, mm2/s | 11 | |
| 11 |
| Thermal Shock Resistance, points | 24 to 29 | |
| 25 to 29 |
Alloy Composition
| Carbon (C), % | 0.27 to 0.34 | |
| 0.32 to 0.38 |
| Chromium (Cr), % | 1.3 to 1.7 | |
| 1.4 to 1.7 |
| Iron (Fe), % | 95.7 to 97.5 | |
| 94.2 to 96.1 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.3 to 0.5 | |
| 0.15 to 0.35 |
| Nickel (Ni), % | 0 | |
| 1.4 to 1.7 |
| 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 |