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Ductile Cast Iron vs. SAE-AISI D7 Steel

Both ductile cast iron and SAE-AISI D7 steel are iron alloys. They have 82% 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 D7 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
0.28
Shear Modulus, GPa 64 to 70
73
Tensile Strength: Ultimate (UTS), MPa 460 to 920
800 to 2120

Thermal Properties

Latent Heat of Fusion, J/g 270
270
Melting Completion (Liquidus), °C 1160
1440
Melting Onset (Solidus), °C 1120
1400
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 31 to 36
27
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
10
Density, g/cm3 7.1 to 7.5
7.6
Embodied Carbon, kg CO2/kg material 1.5
11
Embodied Energy, MJ/kg 21
180
Embodied Water, L/kg 43
130

Common Calculations

Stiffness to Weight: Axial, points 12 to 14
14
Stiffness to Weight: Bending, points 24 to 26
25
Strength to Weight: Axial, points 17 to 35
29 to 78
Strength to Weight: Bending, points 18 to 29
25 to 48
Thermal Diffusivity, mm2/s 8.9 to 10
7.4
Thermal Shock Resistance, points 17 to 35
27 to 72

Alloy Composition

Carbon (C), % 3.0 to 3.5
2.2 to 2.5
Chromium (Cr), % 0
11.5 to 13.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.7 to 95.5
76.6 to 81.9
Manganese (Mn), % 0
0 to 0.6
Molybdenum (Mo), % 0
0.7 to 1.2
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 0.6
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
3.8 to 4.4

Comparable Variants