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ACI-ASTM CA40 Steel vs. Hafnia

ACI-ASTM CA40 steel and hafnia belong to fundamentally different material chemistries. ACI-ASTM CA40 steel is a metal, while hafnia is a ceramic material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 10 material properties with values for both materials. Properties with values for just one material (23, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CA40 steel and the bottom bar is hafnia.

ACI-ASTM CA40 (SCS2A, J91153) Cast Stainless SteelHafnia (Hafnium Oxide, HfO2)
Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 7.7
9.7
Elastic (Young's, Tensile) Modulus, GPa 190
57
Maximum Temperature: Mechanical, °C 750
2800
Melting Onset (Solidus), °C 1500
2900
Specific Heat Capacity, J/kg-K 480
120
Stiffness to Weight: Axial, points 14
3.3
Stiffness to Weight: Bending, points 25
13
Thermal Conductivity, W/m-K 25
1.1
Thermal Diffusivity, mm2/s 6.7
0.95
Thermal Expansion, µm/m-K 10
6.0