ACI-ASTM CA40 Steel vs. Carbon-carbon
ACI-ASTM CA40 steel and carbon-carbon belong to fundamentally different material chemistries. ACI-ASTM CA40 steel is a metal, while carbon-carbon is a ceramic material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 18 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is ACI-ASTM CA40 steel and the bottom bar is carbon-carbon.
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 95 |
| Poisson's Ratio | 0.28 | |
| 0.32 |
| Shear Modulus, GPa | 76 | |
| 36 |
| Tensile Strength: Ultimate (UTS), MPa | 910 | |
| 19 |
Thermal Properties
| Maximum Temperature: Corrosion, °C | 390 | |
| 350 |
| Maximum Temperature: Mechanical, °C | 750 | |
| 2400 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 760 |
| Thermal Conductivity, W/m-K | 25 | |
| 40 |
| Thermal Expansion, µm/m-K | 10 | |
| 4.0 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 3.0 | |
| 0.090 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.5 | |
| 0.48 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.7 | |
| 1.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 31 |
| Stiffness to Weight: Bending, points | 25 | |
| 89 |
| Strength to Weight: Axial, points | 33 | |
| 3.0 |
| Strength to Weight: Bending, points | 27 | |
| 9.1 |
| Thermal Diffusivity, mm2/s | 6.7 | |
| 31 |
| Thermal Shock Resistance, points | 33 | |
| 3.5 |