SAE-AISI 81B45 Steel vs. ASTM A285 Carbon Steel
Both SAE-AISI 81B45 steel and ASTM A285 carbon steel are iron alloys.
For each property being compared, the top bar is SAE-AISI 81B45 steel and the bottom bar is ASTM A285 carbon steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 to 200 | |
| 110 to 130 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 12 to 24 | |
| 30 to 34 |
| Fatigue Strength, MPa | 250 to 350 | |
| 150 to 180 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 73 |
| Shear Strength, MPa | 340 to 400 | |
| 250 to 290 |
| Tensile Strength: Ultimate (UTS), MPa | 540 to 670 | |
| 380 to 450 |
| Tensile Strength: Yield (Proof), MPa | 350 to 560 | |
| 190 to 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 400 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1470 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 to 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 40 | |
| 53 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 7.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 8.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.3 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 1.4 |
| Embodied Energy, MJ/kg | 20 | |
| 18 |
| Embodied Water, L/kg | 49 | |
| 46 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 77 to 110 | |
| 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 320 to 840 | |
| 94 to 150 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 19 to 24 | |
| 13 to 16 |
| Strength to Weight: Bending, points | 19 to 22 | |
| 15 to 17 |
| Thermal Diffusivity, mm2/s | 11 | |
| 14 |
| Thermal Shock Resistance, points | 17 to 21 | |
| 12 to 14 |