EN 1.7709 Steel vs. EN 1.7720 Steel
Both EN 1.7709 steel and EN 1.7720 steel are iron alloys. They have a very high 99% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is EN 1.7709 steel and the bottom bar is EN 1.7720 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 230 | |
| 180 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 650 to 780 | |
| 590 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 440 | |
| 410 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 33 | |
| 40 |
| Thermal Expansion, µm/m-K | 11 | |
| 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 | 3.4 | |
| 2.8 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 2.3 | |
| 2.2 |
| Embodied Energy, MJ/kg | 32 | |
| 30 |
| Embodied Water, L/kg | 56 | |
| 51 |
Common Calculations
| PREN (Pitting Resistance) | 3.6 | |
| 2.1 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 to 27 | |
| 21 |
| Strength to Weight: Bending, points | 21 to 24 | |
| 20 |
| Thermal Diffusivity, mm2/s | 8.9 | |
| 11 |
| Thermal Shock Resistance, points | 22 to 26 | |
| 17 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.030 | |
| 0 |
| Carbon (C), % | 0.17 to 0.25 | |
| 0.1 to 0.15 |
| Chromium (Cr), % | 1.2 to 1.5 | |
| 0.3 to 0.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 95.2 to 97.5 | |
| 96.6 to 98.6 |
| Manganese (Mn), % | 0.4 to 0.8 | |
| 0.4 to 0.7 |
| Molybdenum (Mo), % | 0.55 to 0.8 | |
| 0.4 to 0.6 |
| Nickel (Ni), % | 0 to 0.6 | |
| 0 to 0.4 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.45 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.020 |
| Vanadium (V), % | 0.2 to 0.35 | |
| 0.22 to 0.3 |