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Ductile Cast Iron vs. SAE-AISI A7 Steel

Both ductile cast iron and SAE-AISI A7 steel are iron alloys. They have 87% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is SAE-AISI A7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 170 to 180
190
Poisson's Ratio 0.28 to 0.31
0.29
Shear Modulus, GPa 64 to 70
72
Tensile Strength: Ultimate (UTS), MPa 460 to 920
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1160
1470
Melting Onset (Solidus), °C 1120
1430
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 31 to 36
37
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
10
Density, g/cm3 7.1 to 7.5
7.7
Embodied Carbon, kg CO2/kg material 1.5
13
Embodied Energy, MJ/kg 21
200
Embodied Water, L/kg 43
100

Common Calculations

Stiffness to Weight: Axial, points 12 to 14
13
Stiffness to Weight: Bending, points 24 to 26
25
Strength to Weight: Axial, points 17 to 35
29 to 77
Strength to Weight: Bending, points 18 to 29
25 to 48
Thermal Diffusivity, mm2/s 8.9 to 10
10
Thermal Shock Resistance, points 17 to 35
27 to 72

Alloy Composition

Carbon (C), % 3.0 to 3.5
2.0 to 2.9
Chromium (Cr), % 0
5.0 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.7 to 95.5
81.4 to 87.7
Manganese (Mn), % 0
0 to 0.8
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.080
0 to 0.030
Silicon (Si), % 1.5 to 2.8
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
0.5 to 1.5
Vanadium (V), % 0
3.9 to 5.2

Comparable Variants