EN 1.7231 Steel vs. EN 1.6553 Steel
Both EN 1.7231 steel and EN 1.6553 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is EN 1.7231 steel and the bottom bar is EN 1.6553 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 240 to 280 | |
| 210 to 240 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 11 to 12 | |
| 19 to 21 |
| Fatigue Strength, MPa | 360 to 500 | |
| 330 to 460 |
| Impact Strength: V-Notched Charpy, J | 28 to 30 | |
| 30 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 790 to 930 | |
| 710 to 800 |
| Tensile Strength: Yield (Proof), MPa | 570 to 800 | |
| 470 to 670 |
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 | 46 | |
| 39 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 7.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.5 | |
| 2.7 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.6 |
| Embodied Energy, MJ/kg | 20 | |
| 21 |
| Embodied Water, L/kg | 51 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 87 to 100 | |
| 130 to 150 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 870 to 1700 | |
| 600 to 1190 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 28 to 33 | |
| 25 to 28 |
| Strength to Weight: Bending, points | 24 to 27 | |
| 23 to 24 |
| Thermal Diffusivity, mm2/s | 12 | |
| 10 |
| Thermal Shock Resistance, points | 23 to 27 | |
| 21 to 23 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.45 | |
| 0.23 to 0.28 |
| Chromium (Cr), % | 0.8 to 1.2 | |
| 0.4 to 0.8 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 96.4 to 98.1 | |
| 95.6 to 98.2 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0.15 to 0.3 | |
| 0.15 to 0.3 |
| Nickel (Ni), % | 0 | |
| 0.4 to 0.8 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 0.8 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.025 |
| Vanadium (V), % | 0 | |
| 0 to 0.030 |