EN 1.1221 Steel vs. SAE-AISI 81B45 Steel
Both EN 1.1221 steel and SAE-AISI 81B45 steel are iron alloys. Their average alloy composition is basically identical.
For each property being compared, the top bar is EN 1.1221 steel and the bottom bar is SAE-AISI 81B45 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 250 | |
| 160 to 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 10 to 21 | |
| 12 to 24 |
| Fatigue Strength, MPa | 240 to 340 | |
| 250 to 350 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 73 |
| Shear Strength, MPa | 450 to 520 | |
| 340 to 400 |
| Tensile Strength: Ultimate (UTS), MPa | 730 to 870 | |
| 540 to 670 |
| Tensile Strength: Yield (Proof), MPa | 390 to 550 | |
| 350 to 560 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 410 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 48 | |
| 40 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.3 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.1 | |
| 2.3 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.5 |
| Embodied Energy, MJ/kg | 19 | |
| 20 |
| Embodied Water, L/kg | 47 | |
| 49 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 67 to 130 | |
| 77 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 410 to 800 | |
| 320 to 840 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 31 | |
| 19 to 24 |
| Strength to Weight: Bending, points | 23 to 26 | |
| 19 to 22 |
| Thermal Diffusivity, mm2/s | 13 | |
| 11 |
| Thermal Shock Resistance, points | 23 to 28 | |
| 17 to 21 |
Alloy Composition
| Boron (B), % | 0 | |
| 0.00050 to 0.0030 |
| Carbon (C), % | 0.57 to 0.65 | |
| 0.43 to 0.48 |
| Chromium (Cr), % | 0 to 0.4 | |
| 0.35 to 0.55 |
| Iron (Fe), % | 97.1 to 98.8 | |
| 97 to 98 |
| Manganese (Mn), % | 0.6 to 0.9 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.1 | |
| 0.080 to 0.15 |
| Nickel (Ni), % | 0 to 0.4 | |
| 0.2 to 0.4 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 0.4 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 to 0.040 |