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Ductile Cast Iron vs. ACI-ASTM CG3M Steel

Both ductile cast iron and ACI-ASTM CG3M steel are iron alloys. They have 65% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is ACI-ASTM CG3M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
170
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
200
Elongation at Break, % 2.1 to 20
28
Poisson's Ratio 0.28 to 0.31
0.28
Shear Modulus, GPa 64 to 70
79
Tensile Strength: Ultimate (UTS), MPa 460 to 920
580
Tensile Strength: Yield (Proof), MPa 310 to 670
270

Thermal Properties

Latent Heat of Fusion, J/g 270
300
Maximum Temperature: Mechanical, °C 290
1020
Melting Completion (Liquidus), °C 1160
1450
Melting Onset (Solidus), °C 1120
1400
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 31 to 36
15
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
20
Density, g/cm3 7.1 to 7.5
7.9
Embodied Carbon, kg CO2/kg material 1.5
4.1
Embodied Energy, MJ/kg 21
56
Embodied Water, L/kg 43
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 80
130
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 1330
190
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
20
Strength to Weight: Bending, points 18 to 29
20
Thermal Diffusivity, mm2/s 8.9 to 10
4.1
Thermal Shock Resistance, points 17 to 35
13

Alloy Composition

Carbon (C), % 3.0 to 3.5
0 to 0.030
Chromium (Cr), % 0
18 to 21
Iron (Fe), % 93.7 to 95.5
58.9 to 70
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
9.0 to 13
Phosphorus (P), % 0 to 0.080
0 to 0.040
Silicon (Si), % 1.5 to 2.8
0 to 1.5
Sulfur (S), % 0
0 to 0.040