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Ductile Cast Iron vs. Grade FDC Steel

Both ductile cast iron and grade FDC steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is grade FDC steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
510
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
80
Tensile Strength: Ultimate (UTS), MPa 460 to 920
1680

Thermal Properties

Latent Heat of Fusion, J/g 270
250
Maximum Temperature: Mechanical, °C 290
400
Melting Completion (Liquidus), °C 1160
1450
Melting Onset (Solidus), °C 1120
1410
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 31 to 36
51
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
1.9
Density, g/cm3 7.1 to 7.5
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.4
Embodied Energy, MJ/kg 21
19
Embodied Water, L/kg 43
47

Common Calculations

Stiffness to Weight: Axial, points 12 to 14
13
Stiffness to Weight: Bending, points 24 to 26
24
Strength to Weight: Axial, points 17 to 35
60
Strength to Weight: Bending, points 18 to 29
40
Thermal Diffusivity, mm2/s 8.9 to 10
14
Thermal Shock Resistance, points 17 to 35
50

Alloy Composition

Carbon (C), % 3.0 to 3.5
0.6 to 0.75
Chromium (Cr), % 0
0 to 0.3
Copper (Cu), % 0
0 to 0.12
Iron (Fe), % 93.7 to 95.5
98 to 99.4
Manganese (Mn), % 0
0.5 to 1.2
Phosphorus (P), % 0 to 0.080
0 to 0.030
Silicon (Si), % 1.5 to 2.8
0.1 to 0.35
Sulfur (S), % 0
0 to 0.025