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Austempered Cast Iron vs. SAE-AISI H23 Steel

Both austempered cast iron and SAE-AISI H23 steel are iron alloys. They have 75% 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 austempered cast iron and the bottom bar is SAE-AISI H23 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 62 to 69
80
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
760 to 1550

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1380
1680
Melting Onset (Solidus), °C 1340
1630
Specific Heat Capacity, J/kg-K 490
440
Thermal Conductivity, W/m-K 42
20
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
34
Density, g/cm3 7.5
8.7
Embodied Carbon, kg CO2/kg material 1.8
6.9
Embodied Energy, MJ/kg 25
110
Embodied Water, L/kg 48
120

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 32 to 66
24 to 49
Strength to Weight: Bending, points 27 to 44
21 to 34
Thermal Diffusivity, mm2/s 11
5.2
Thermal Shock Resistance, points 25 to 53
23 to 47

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Arsenic (As), % 0 to 0.020
0
Carbon (C), % 3.4 to 3.8
0.25 to 0.35
Chromium (Cr), % 0 to 0.1
11 to 12.8
Copper (Cu), % 0 to 0.8
0 to 0.25
Iron (Fe), % 89.6 to 94
71.3 to 76.7
Magnesium (Mg), % 0 to 0.040
0
Manganese (Mn), % 0.3 to 0.4
0.15 to 0.4
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 2.0
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Selenium (Se), % 0 to 0.030
0
Silicon (Si), % 2.3 to 2.7
0.15 to 0.6
Sulfur (S), % 0 to 0.020
0 to 0.030
Tin (Sn), % 0 to 0.020
0
Tungsten (W), % 0
11 to 12.8
Vanadium (V), % 0 to 0.1
0.75 to 1.3