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Ductile Cast Iron vs. ASTM A732 Cast Steel

Both ductile cast iron and ASTM A732 cast steel are iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ductile cast iron and the bottom bar is ASTM A732 cast steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
140 to 440
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
190
Elongation at Break, % 2.1 to 20
4.0 to 25
Poisson's Ratio 0.28 to 0.31
0.29
Shear Modulus, GPa 64 to 70
72 to 73
Tensile Strength: Ultimate (UTS), MPa 460 to 920
460 to 1470
Tensile Strength: Yield (Proof), MPa 310 to 670
310 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 270
250 to 260
Maximum Temperature: Mechanical, °C 290
400 to 430
Melting Completion (Liquidus), °C 1160
1440 to 1460
Melting Onset (Solidus), °C 1120
1400 to 1420
Specific Heat Capacity, J/kg-K 490
470 to 480
Thermal Conductivity, W/m-K 31 to 36
39 to 50
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.1 to 7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.8 to 9.4
8.2 to 8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.0 to 3.8
Density, g/cm3 7.1 to 7.5
7.8 to 7.9
Embodied Carbon, kg CO2/kg material 1.5
1.4 to 1.7
Embodied Energy, MJ/kg 21
19 to 24
Embodied Water, L/kg 43
47 to 54

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 80
45 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 1330
260 to 4770
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
16 to 52
Strength to Weight: Bending, points 18 to 29
17 to 37
Thermal Diffusivity, mm2/s 8.9 to 10
10 to 14
Thermal Shock Resistance, points 17 to 35
14 to 43