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Automotive Grey Cast Iron vs. ASTM B780 Alloy

Automotive grey cast iron belongs to the iron alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is automotive grey cast iron and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
83
Elongation at Break, % 9.6 to 14
1.1 to 9.1
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 69 to 70
30
Tensile Strength: Ultimate (UTS), MPa 140 to 290
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
140
Specific Heat Capacity, J/kg-K 490
270
Thermal Expansion, µm/m-K 12 to 14
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4 to 7.6
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.1
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 7.5 to 7.6
10

Common Calculations

Stiffness to Weight: Axial, points 13
4.5
Stiffness to Weight: Bending, points 25
14
Strength to Weight: Axial, points 5.2 to 11
9.1 to 16
Strength to Weight: Bending, points 8.0 to 13
11 to 15
Thermal Shock Resistance, points 4.2 to 8.6
16 to 29