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SAE-AISI T8 Steel vs. Austempered Cast Iron

Both SAE-AISI T8 steel and austempered cast iron are iron alloys. They have 74% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T8 steel and the bottom bar is austempered cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
62 to 69
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
860 to 1800

Thermal Properties

Latent Heat of Fusion, J/g 250
280
Melting Completion (Liquidus), °C 1730
1380
Melting Onset (Solidus), °C 1670
1340
Specific Heat Capacity, J/kg-K 420
490
Thermal Conductivity, W/m-K 18
42
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 45
2.9
Density, g/cm3 9.0
7.5
Embodied Carbon, kg CO2/kg material 10
1.8
Embodied Energy, MJ/kg 160
25
Embodied Water, L/kg 120
48

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 24 to 66
32 to 66
Strength to Weight: Bending, points 21 to 41
27 to 44
Thermal Diffusivity, mm2/s 4.8
11
Thermal Shock Resistance, points 24 to 66
25 to 53

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.020
Carbon (C), % 0.75 to 0.85
3.4 to 3.8
Chromium (Cr), % 3.8 to 4.5
0 to 0.1
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.8
Iron (Fe), % 69.3 to 75.4
89.6 to 94
Magnesium (Mg), % 0
0 to 0.040
Manganese (Mn), % 0.2 to 0.4
0.3 to 0.4
Molybdenum (Mo), % 0.4 to 1.0
0 to 0.3
Nickel (Ni), % 0 to 0.3
0 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.040
Selenium (Se), % 0
0 to 0.030
Silicon (Si), % 0.2 to 0.4
2.3 to 2.7
Sulfur (S), % 0 to 0.030
0 to 0.020
Tin (Sn), % 0
0 to 0.020
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0 to 0.1