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Automotive Grey Cast Iron vs. R05255 Alloy

Automotive grey cast iron belongs to the iron alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (8, 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 R05255 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 9.6 to 14
20
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 69 to 70
70
Tensile Strength: Ultimate (UTS), MPa 140 to 290
540
Tensile Strength: Yield (Proof), MPa 94 to 200
450

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
140
Specific Heat Capacity, J/kg-K 490
140
Thermal Conductivity, W/m-K 41 to 43
59
Thermal Expansion, µm/m-K 12 to 14
6.6

Otherwise Unclassified Properties

Density, g/cm3 7.5 to 7.6
17
Embodied Water, L/kg 44 to 51
630

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 18 to 25
100
Resilience: Unit (Modulus of Resilience), kJ/m3 25 to 110
530
Stiffness to Weight: Axial, points 13
6.3
Stiffness to Weight: Bending, points 25
11
Strength to Weight: Axial, points 5.2 to 11
9.1
Strength to Weight: Bending, points 8.0 to 13
8.9
Thermal Diffusivity, mm2/s 11 to 12
25
Thermal Shock Resistance, points 4.2 to 8.6
31