ACI-ASTM CF20 Steel vs. SAE-AISI 1078 Steel
Both ACI-ASTM CF20 steel and SAE-AISI 1078 steel are iron alloys. They have 70% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is ACI-ASTM CF20 steel and the bottom bar is SAE-AISI 1078 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 160 | |
| 220 to 230 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 190 |
| Elongation at Break, % | 50 | |
| 11 to 14 |
| Fatigue Strength, MPa | 240 | |
| 270 to 350 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 72 |
| Tensile Strength: Ultimate (UTS), MPa | 530 | |
| 730 to 780 |
| Tensile Strength: Yield (Proof), MPa | 250 | |
| 430 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 970 | |
| 400 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1460 |
| Melting Onset (Solidus), °C | 1410 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 16 | |
| 49 |
| Thermal Expansion, µm/m-K | 17 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.3 | |
| 8.1 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 16 | |
| 1.8 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 3.1 | |
| 1.4 |
| Embodied Energy, MJ/kg | 44 | |
| 18 |
| Embodied Water, L/kg | 150 | |
| 45 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 220 | |
| 77 to 90 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 | |
| 490 to 860 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 19 | |
| 26 to 28 |
| Strength to Weight: Bending, points | 19 | |
| 23 to 24 |
| Thermal Diffusivity, mm2/s | 4.3 | |
| 13 |
| Thermal Shock Resistance, points | 11 | |
| 25 to 26 |
Alloy Composition
| Carbon (C), % | 0 to 0.2 | |
| 0.72 to 0.85 |
| Chromium (Cr), % | 18 to 21 | |
| 0 |
| Iron (Fe), % | 64.2 to 74 | |
| 98.5 to 99 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0.3 to 0.6 |
| Nickel (Ni), % | 8.0 to 11 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 2.0 | |
| 0 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 to 0.050 |