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SAE-AISI H23 Steel vs. Austempered Cast Iron

Both SAE-AISI H23 steel and austempered cast iron 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 SAE-AISI H23 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 0.28
0.29
Shear Modulus, GPa 80
62 to 69
Tensile Strength: Ultimate (UTS), MPa 760 to 1550
860 to 1800

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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