SAE-AISI 8740 Steel vs. ACI-ASTM CB30 Steel
Both SAE-AISI 8740 steel and ACI-ASTM CB30 steel are iron alloys. They have 79% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is SAE-AISI 8740 steel and the bottom bar is ACI-ASTM CB30 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 170 to 200 | |
| 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 73 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 670 | |
| 500 |
| Tensile Strength: Yield (Proof), MPa | 380 to 570 | |
| 230 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 940 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1430 |
| Melting Onset (Solidus), °C | 1420 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 39 | |
| 21 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 2.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 3.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 10 |
| Density, g/cm3 | 7.8 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 2.3 |
| Embodied Energy, MJ/kg | 20 | |
| 33 |
| Embodied Water, L/kg | 50 | |
| 130 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 390 to 850 | |
| 140 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 20 to 24 | |
| 18 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 18 |
| Thermal Diffusivity, mm2/s | 10 | |
| 5.6 |
| Thermal Shock Resistance, points | 17 to 20 | |
| 17 |
Alloy Composition
| Carbon (C), % | 0.38 to 0.43 | |
| 0 to 0.3 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 18 to 21 |
| Copper (Cu), % | 0 | |
| 0 to 1.2 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 72.9 to 82 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.2 to 0.3 | |
| 0 |
| Nickel (Ni), % | 0.4 to 0.7 | |
| 0 to 2.0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.040 |