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Ductile Cast Iron vs. SAE-AISI S7 Steel

Both ductile cast iron and SAE-AISI S7 steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, 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 S7 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
74
Tensile Strength: Ultimate (UTS), MPa 460 to 920
670 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1160
1460
Melting Onset (Solidus), °C 1120
1420
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 31 to 36
40
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
9.0

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
5.0
Density, g/cm3 7.1 to 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
2.3
Embodied Energy, MJ/kg 21
31
Embodied Water, L/kg 43
65

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
24 to 72
Strength to Weight: Bending, points 18 to 29
22 to 46
Thermal Diffusivity, mm2/s 8.9 to 10
11
Thermal Shock Resistance, points 17 to 35
22 to 66

Alloy Composition

Carbon (C), % 3.0 to 3.5
0.45 to 0.55
Chromium (Cr), % 0
3.0 to 3.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.7 to 95.5
91.6 to 94.9
Manganese (Mn), % 0
0.2 to 0.9
Molybdenum (Mo), % 0
1.3 to 1.8
Phosphorus (P), % 0 to 0.080
0 to 0.030
Silicon (Si), % 1.5 to 2.8
0.2 to 1.0
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0 to 0.3

Comparable Variants