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ASTM B631 Class A vs. Ductile Cast Iron

ASTM B631 class A belongs to the otherwise unclassified metals classification, while ductile cast iron belongs to the iron alloys. There are 16 material properties with values for both materials. Properties with values for just one material (16, 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 ASTM B631 class A and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
170 to 180
Poisson's Ratio 0.3
0.28 to 0.31
Shear Modulus, GPa 85 to 86
64 to 70

Thermal Properties

Latent Heat of Fusion, J/g 160
270
Melting Completion (Liquidus), °C 2680 to 2690
1160
Specific Heat Capacity, J/kg-K 160
490
Thermal Conductivity, W/m-K 420
31 to 36
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
8.8 to 9.4

Otherwise Unclassified Properties

Density, g/cm3 15
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 43
1.5
Embodied Energy, MJ/kg 670
21

Common Calculations

Stiffness to Weight: Axial, points 8.5
12 to 14
Stiffness to Weight: Bending, points 14
24 to 26
Thermal Diffusivity, mm2/s 180
8.9 to 10

Comparable Variants