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ACI-ASTM CA40 Steel vs. Machinable Glass-ceramic

ACI-ASTM CA40 steel and machinable glass-ceramic belong to fundamentally different material chemistries. ACI-ASTM CA40 steel is a metal, while machinable glass-ceramic is a ceramic material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 15 material properties with values for both materials. Properties with values for just one material (27, 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 machinable glass-ceramic.

ACI-ASTM CA40 (SCS2A, J91153) Cast Stainless SteelMachinable Glass-Ceramic
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
67
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
26
Tensile Strength: Ultimate (UTS), MPa 910
84

Thermal Properties

Maximum Temperature: Mechanical, °C 750
760
Specific Heat Capacity, J/kg-K 480
790
Thermal Conductivity, W/m-K 25
1.2
Thermal Expansion, µm/m-K 10
21

Otherwise Unclassified Properties

Density, g/cm3 7.7
2.7

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
51
Strength to Weight: Axial, points 33
8.8
Strength to Weight: Bending, points 27
16
Thermal Diffusivity, mm2/s 6.7
0.56
Thermal Shock Resistance, points 33
4.3