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ACI-ASTM CA40 Steel vs. Graphite

ACI-ASTM CA40 steel and graphite belong to fundamentally different material chemistries. ACI-ASTM CA40 steel is a metal, while graphite is a ceramic material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 12 material properties with values for both materials. Properties with values for just one material (23, 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 graphite.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
21
Tensile Strength: Ultimate (UTS), MPa 910
18

Thermal Properties

Maximum Temperature: Corrosion, °C 390
180
Maximum Temperature: Mechanical, °C 750
220
Thermal Conductivity, W/m-K 25
6.0
Thermal Expansion, µm/m-K 10
4.9

Otherwise Unclassified Properties

Density, g/cm3 7.7
1.8

Common Calculations

Stiffness to Weight: Axial, points 14
6.7
Stiffness to Weight: Bending, points 25
53
Strength to Weight: Axial, points 33
2.9
Strength to Weight: Bending, points 27
8.7
Thermal Shock Resistance, points 33
12