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Ductile Cast Iron vs. Austempered Cast Iron

Both ductile cast iron and austempered cast iron are iron alloys. They have a very high 97% of their average alloy composition in common. There are 26 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 austempered cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160 to 310
270 to 490
Elastic (Young's, Tensile) Modulus, GPa 170 to 180
180
Elongation at Break, % 2.1 to 20
1.1 to 13
Poisson's Ratio 0.28 to 0.31
0.29
Shear Modulus, GPa 64 to 70
62 to 69
Tensile Strength: Ultimate (UTS), MPa 460 to 920
860 to 1800
Tensile Strength: Yield (Proof), MPa 310 to 670
560 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1160
1380
Melting Onset (Solidus), °C 1120
1340
Specific Heat Capacity, J/kg-K 490
490
Thermal Conductivity, W/m-K 31 to 36
42
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.9
Density, g/cm3 7.1 to 7.5
7.5
Embodied Carbon, kg CO2/kg material 1.5
1.8
Embodied Energy, MJ/kg 21
25
Embodied Water, L/kg 43
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17 to 80
19 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 280 to 1330
880 to 3970
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
32 to 66
Strength to Weight: Bending, points 18 to 29
27 to 44
Thermal Diffusivity, mm2/s 8.9 to 10
11
Thermal Shock Resistance, points 17 to 35
25 to 53

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.020
Carbon (C), % 3.0 to 3.5
3.4 to 3.8
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0
0 to 0.8
Iron (Fe), % 93.7 to 95.5
89.6 to 94
Magnesium (Mg), % 0
0 to 0.040
Manganese (Mn), % 0
0.3 to 0.4
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 0
0 to 2.0
Phosphorus (P), % 0 to 0.080
0 to 0.040
Selenium (Se), % 0
0 to 0.030
Silicon (Si), % 1.5 to 2.8
2.3 to 2.7
Sulfur (S), % 0
0 to 0.020
Tin (Sn), % 0
0 to 0.020
Vanadium (V), % 0
0 to 0.1

Comparable Variants