EN 1.7710 Steel vs. EN 1.7720 Steel
Both EN 1.7710 steel and EN 1.7720 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 1.7710 steel and the bottom bar is EN 1.7720 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 to 320 | |
| 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 6.8 to 11 | |
| 19 |
| Fatigue Strength, MPa | 500 to 620 | |
| 230 |
| Impact Strength: V-Notched Charpy, J | 30 | |
| 30 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1070 | |
| 590 |
| Tensile Strength: Yield (Proof), MPa | 800 to 1060 | |
| 340 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 410 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1470 |
| Melting Onset (Solidus), °C | 1430 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 41 | |
| 40 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 3.5 | |
| 2.8 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 2.2 |
| Embodied Energy, MJ/kg | 30 | |
| 30 |
| Embodied Water, L/kg | 57 | |
| 51 |
Common Calculations
| PREN (Pitting Resistance) | 4.5 | |
| 2.1 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 73 to 100 | |
| 97 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1680 to 2970 | |
| 300 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 33 to 38 | |
| 21 |
| Strength to Weight: Bending, points | 27 to 30 | |
| 20 |
| Thermal Diffusivity, mm2/s | 11 | |
| 11 |
| Thermal Shock Resistance, points | 27 to 31 | |
| 17 |
Alloy Composition
| Carbon (C), % | 0.12 to 0.18 | |
| 0.1 to 0.15 |
| Chromium (Cr), % | 1.3 to 1.8 | |
| 0.3 to 0.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 95.1 to 97 | |
| 96.6 to 98.6 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.4 to 0.7 |
| Molybdenum (Mo), % | 0.8 to 1.0 | |
| 0.4 to 0.6 |
| Nickel (Ni), % | 0 | |
| 0 to 0.4 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 0.45 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.020 |
| Vanadium (V), % | 0.15 to 0.25 | |
| 0.22 to 0.3 |