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Automotive Grey Cast Iron vs. 90-platinum 10-iridium

Automotive grey cast iron belongs to the iron alloys classification, while 90-platinum 10-iridium belongs to the otherwise unclassified metals. There are 14 material properties with values for both materials. Properties with values for just one material (15, 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 automotive grey cast iron and the bottom bar is 90-platinum 10-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 9.6 to 14
5.5 to 34
Poisson's Ratio 0.29
0.38
Shear Modulus, GPa 69 to 70
74
Tensile Strength: Ultimate (UTS), MPa 140 to 290
330 to 550

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
100
Specific Heat Capacity, J/kg-K 490
130
Thermal Expansion, µm/m-K 12 to 14
8.6

Otherwise Unclassified Properties

Density, g/cm3 7.5 to 7.6
22

Common Calculations

Stiffness to Weight: Axial, points 13
5.3
Stiffness to Weight: Bending, points 25
9.1
Strength to Weight: Axial, points 5.2 to 11
4.2 to 7.1
Strength to Weight: Bending, points 8.0 to 13
4.9 to 6.9
Thermal Shock Resistance, points 4.2 to 8.6
13 to 22