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Ductile Cast Iron vs. Grey Cast Iron

Both ductile cast iron and grey cast iron are iron alloys. They have a very high 98% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
160 to 300
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
180
Elongation at Break, % 2.1 to 20
9.6
Poisson's Ratio 0.28 to 0.31
0.29
Shear Modulus, GPa 64 to 70
69
Shear Strength, MPa 420 to 800
180 to 610
Tensile Strength: Ultimate (UTS), MPa 460 to 920
160 to 450
Tensile Strength: Yield (Proof), MPa 310 to 670
98 to 290

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1160
1380
Melting Onset (Solidus), °C 1120
1180
Specific Heat Capacity, J/kg-K 490
490
Thermal Conductivity, W/m-K 31 to 36
46
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
1.9
Density, g/cm3 7.1 to 7.5
7.5
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 21
21
Embodied Water, L/kg 43
44

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 80
13 to 37
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 1330
27 to 240
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
5.8 to 17
Strength to Weight: Bending, points 18 to 29
8.7 to 17
Thermal Diffusivity, mm2/s 8.9 to 10
13
Thermal Shock Resistance, points 17 to 35
6.0 to 17

Alloy Composition

Carbon (C), % 3.0 to 3.5
3.1 to 3.4
Iron (Fe), % 93.7 to 95.5
92.1 to 93.9
Manganese (Mn), % 0
0.5 to 0.7
Phosphorus (P), % 0 to 0.080
0 to 0.9
Silicon (Si), % 1.5 to 2.8
2.5 to 2.8
Sulfur (S), % 0
0 to 0.15

Comparable Variants