Cold Finished SAE-AISI 50B60 vs. Cold Finished SAE-AISI 81B45
Both cold finished SAE-AISI 50B60 and cold finished SAE-AISI 81B45 are iron alloys. Both are furnished in the cold worked (strain hardened) condition. Their average alloy composition is basically identical.
For each property being compared, the top bar is cold finished SAE-AISI 50B60 and the bottom bar is cold finished SAE-AISI 81B45.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 190 | |
| 200 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 | |
| 12 |
| Fatigue Strength, MPa | 330 | |
| 350 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 72 | |
| 73 |
| Shear Strength, MPa | 380 | |
| 400 |
| Tensile Strength: Ultimate (UTS), MPa | 630 | |
| 670 |
| Tensile Strength: Yield (Proof), MPa | 530 | |
| 560 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 410 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 45 | |
| 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 | 2.0 | |
| 2.3 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 1.5 |
| Embodied Energy, MJ/kg | 19 | |
| 20 |
| Embodied Water, L/kg | 48 | |
| 49 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 | |
| 77 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 | |
| 840 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 23 | |
| 24 |
| Strength to Weight: Bending, points | 21 | |
| 22 |
| Thermal Diffusivity, mm2/s | 12 | |
| 11 |
| Thermal Shock Resistance, points | 20 | |
| 21 |
Alloy Composition
| Boron (B), % | 0.00050 to 0.0030 | |
| 0.00050 to 0.0030 |
| Carbon (C), % | 0.56 to 0.64 | |
| 0.43 to 0.48 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0.35 to 0.55 |
| Iron (Fe), % | 97.3 to 98.1 | |
| 97 to 98 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 0.080 to 0.15 |
| Nickel (Ni), % | 0 | |
| 0.2 to 0.4 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.040 |