EN 1.7701 Steel vs. EN 1.7218 Steel
Both EN 1.7701 steel and EN 1.7218 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is EN 1.7701 steel and the bottom bar is EN 1.7218 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 480 | |
| 150 to 230 |
| 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 | 670 to 2010 | |
| 500 to 1550 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 420 |
| 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 | 44 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.5 | |
| 8.5 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 2.6 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.9 | |
| 1.5 |
| Embodied Energy, MJ/kg | 26 | |
| 20 |
| Embodied Water, L/kg | 52 | |
| 52 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 24 to 71 | |
| 18 to 55 |
| Strength to Weight: Bending, points | 22 to 45 | |
| 18 to 38 |
| Thermal Diffusivity, mm2/s | 12 | |
| 12 |
| Thermal Shock Resistance, points | 20 to 59 | |
| 15 to 46 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.040 |
| Carbon (C), % | 0.48 to 0.56 | |
| 0.22 to 0.29 |
| Chromium (Cr), % | 0.9 to 1.2 | |
| 0.9 to 1.2 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 96.2 to 97.7 | |
| 96.2 to 98.1 |
| Manganese (Mn), % | 0.7 to 1.1 | |
| 0.6 to 0.9 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 0.15 to 0.3 |
| Nickel (Ni), % | 0 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.035 |
| Vanadium (V), % | 0.1 to 0.2 | |
| 0 |