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ASTM B631 Class A vs. Austempered Cast Iron

ASTM B631 class A belongs to the otherwise unclassified metals classification, while austempered cast iron belongs to the iron alloys. There are 14 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class A and the bottom bar is austempered cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
180
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 85 to 86
62 to 69

Thermal Properties

Latent Heat of Fusion, J/g 160
280
Melting Completion (Liquidus), °C 2680 to 2690
1380
Specific Heat Capacity, J/kg-K 160
490
Thermal Conductivity, W/m-K 420
42
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Density, g/cm3 15
7.5
Embodied Carbon, kg CO2/kg material 43
1.8
Embodied Energy, MJ/kg 670
25

Common Calculations

Stiffness to Weight: Axial, points 8.5
13
Stiffness to Weight: Bending, points 14
25
Thermal Diffusivity, mm2/s 180
11