EN 1.7221 Steel vs. EN 1.7231 Steel
Both EN 1.7221 steel and EN 1.7231 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is EN 1.7221 steel and the bottom bar is EN 1.7231 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 230 | |
| 240 to 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 17 | |
| 11 to 12 |
| Fatigue Strength, MPa | 290 to 390 | |
| 360 to 500 |
| Impact Strength: V-Notched Charpy, J | 20 to 38 | |
| 28 to 30 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 650 to 780 | |
| 790 to 930 |
| Tensile Strength: Yield (Proof), MPa | 430 to 630 | |
| 570 to 800 |
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 | |
| 46 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 2.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 20 | |
| 20 |
| Embodied Water, L/kg | 51 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 83 to 98 | |
| 87 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 490 to 1050 | |
| 870 to 1700 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 to 27 | |
| 28 to 33 |
| Strength to Weight: Bending, points | 21 to 24 | |
| 24 to 27 |
| Thermal Diffusivity, mm2/s | 12 | |
| 12 |
| Thermal Shock Resistance, points | 19 to 23 | |
| 23 to 27 |
Alloy Composition
| Carbon (C), % | 0.22 to 0.29 | |
| 0.38 to 0.45 |
| Chromium (Cr), % | 0.8 to 1.2 | |
| 0.8 to 1.2 |
| Iron (Fe), % | 96.8 to 98.3 | |
| 96.4 to 98.1 |
| Manganese (Mn), % | 0.5 to 0.8 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 0.15 to 0.3 |
| 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 |