EN 1.7221 Steel vs. EN 1.6579 Steel
Both EN 1.7221 steel and EN 1.6579 steel are iron alloys. They have a very high 98% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is EN 1.7221 steel and the bottom bar is EN 1.6579 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 to 230 | |
| 260 to 290 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 17 | |
| 11 to 14 |
| Fatigue Strength, MPa | 290 to 390 | |
| 380 to 570 |
| Impact Strength: V-Notched Charpy, J | 20 to 38 | |
| 35 to 41 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 650 to 780 | |
| 850 to 980 |
| Tensile Strength: Yield (Proof), MPa | 430 to 630 | |
| 600 to 910 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 440 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 44 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.8 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.4 | |
| 3.7 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.7 |
| Embodied Energy, MJ/kg | 20 | |
| 22 |
| Embodied Water, L/kg | 51 | |
| 56 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 83 to 98 | |
| 100 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 490 to 1050 | |
| 950 to 2210 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 to 27 | |
| 30 to 35 |
| Strength to Weight: Bending, points | 21 to 24 | |
| 25 to 28 |
| Thermal Diffusivity, mm2/s | 12 | |
| 11 |
| Thermal Shock Resistance, points | 19 to 23 | |
| 25 to 29 |
Alloy Composition
| Carbon (C), % | 0.22 to 0.29 | |
| 0.32 to 0.38 |
| Chromium (Cr), % | 0.8 to 1.2 | |
| 1.4 to 1.7 |
| Iron (Fe), % | 96.8 to 98.3 | |
| 94.2 to 96.1 |
| Manganese (Mn), % | 0.5 to 0.8 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 0.15 to 0.35 |
| Nickel (Ni), % | 0 | |
| 1.4 to 1.7 |
| 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 |