EN 1.7108 +CH Steel vs. EN 1.7220 +CH Steel
Both EN 1.7108 +CH steel and EN 1.7220 +CH steel are iron alloys. Both are furnished in the core hardened (CH) condition. They have a very high 98% of their average alloy composition in common.
For each property being compared, the top bar is EN 1.7108 +CH steel and the bottom bar is EN 1.7220 +CH steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Rockwell C Hardness | 56 | |
| 45 |
| Shear Modulus, GPa | 72 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1800 | |
| 1460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 420 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1460 |
| Melting Onset (Solidus), °C | 1390 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 46 | |
| 44 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.4 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.7 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.1 | |
| 2.5 |
| Density, g/cm3 | 7.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 20 | |
| 20 |
| Embodied Water, L/kg | 47 | |
| 51 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 65 | |
| 52 |
| Strength to Weight: Bending, points | 43 | |
| 36 |
| Thermal Diffusivity, mm2/s | 12 | |
| 12 |
| Thermal Shock Resistance, points | 54 | |
| 43 |
Alloy Composition
| Carbon (C), % | 0.57 to 0.65 | |
| 0.3 to 0.37 |
| Chromium (Cr), % | 0.2 to 0.45 | |
| 0.9 to 1.2 |
| Iron (Fe), % | 95.9 to 96.9 | |
| 96.8 to 98.1 |
| Manganese (Mn), % | 0.7 to 1.0 | |
| 0.6 to 0.9 |
| Molybdenum (Mo), % | 0 | |
| 0.15 to 0.3 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.035 |
| Silicon (Si), % | 1.6 to 2.0 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 to 0.025 | |
| 0 to 0.035 |