ACI-ASTM CB7Cu-1 Steel vs. SAE-AISI 4340 Steel
Both ACI-ASTM CB7Cu-1 steel and SAE-AISI 4340 steel are iron alloys. They have 79% of their average alloy composition in common. There are 29 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 CB7Cu-1 steel and the bottom bar is SAE-AISI 4340 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 300 to 420 | |
| 210 to 360 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 190 |
| Elongation at Break, % | 5.7 to 11 | |
| 12 to 22 |
| Fatigue Strength, MPa | 420 to 590 | |
| 330 to 740 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 76 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 960 to 1350 | |
| 690 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 760 to 1180 | |
| 470 to 1150 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 250 |
| Melting Completion (Liquidus), °C | 1430 | |
| 1460 |
| Melting Onset (Solidus), °C | 1500 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 470 |
| Thermal Conductivity, W/m-K | 17 | |
| 44 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.3 | |
| 8.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 13 | |
| 3.5 |
| Density, g/cm3 | 7.8 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 1.7 |
| Embodied Energy, MJ/kg | 38 | |
| 22 |
| Embodied Water, L/kg | 130 | |
| 53 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 71 to 120 | |
| 79 to 170 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1500 to 3590 | |
| 590 to 3490 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 34 to 48 | |
| 24 to 45 |
| Strength to Weight: Bending, points | 28 to 35 | |
| 22 to 33 |
| Thermal Diffusivity, mm2/s | 4.6 | |
| 12 |
| Thermal Shock Resistance, points | 32 to 45 | |
| 20 to 38 |
Alloy Composition
| Carbon (C), % | 0 to 0.070 | |
| 0.38 to 0.43 |
| Chromium (Cr), % | 15.5 to 17.7 | |
| 0.7 to 0.9 |
| Copper (Cu), % | 2.5 to 3.2 | |
| 0 |
| Iron (Fe), % | 72.3 to 78.4 | |
| 95.1 to 96.3 |
| Manganese (Mn), % | 0 to 0.7 | |
| 0.6 to 0.8 |
| Molybdenum (Mo), % | 0 | |
| 0.2 to 0.3 |
| Nickel (Ni), % | 3.6 to 4.6 | |
| 1.7 to 2.0 |
| Niobium (Nb), % | 0 to 0.35 | |
| 0 |
| Nitrogen (N), % | 0 to 0.050 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |