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Austempered Cast Iron vs. SAE-AISI H25 Steel

Both austempered cast iron and SAE-AISI H25 steel are iron alloys. They have 80% 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 H25 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 62 to 69
79
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
710 to 1620

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1380
1750
Melting Onset (Solidus), °C 1340
1700
Specific Heat Capacity, J/kg-K 490
420
Thermal Conductivity, W/m-K 42
26
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
38
Density, g/cm3 7.5
9.1
Embodied Carbon, kg CO2/kg material 1.8
6.2
Embodied Energy, MJ/kg 25
93
Embodied Water, L/kg 48
83

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 32 to 66
22 to 50
Strength to Weight: Bending, points 27 to 44
20 to 34
Thermal Diffusivity, mm2/s 11
6.7
Thermal Shock Resistance, points 25 to 53
22 to 49

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Arsenic (As), % 0 to 0.020
0
Carbon (C), % 3.4 to 3.8
0.22 to 0.32
Chromium (Cr), % 0 to 0.1
3.8 to 4.5
Copper (Cu), % 0 to 0.8
0 to 0.25
Iron (Fe), % 89.6 to 94
77.2 to 81.3
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 0.4
Sulfur (S), % 0 to 0.020
0 to 0.030
Tin (Sn), % 0 to 0.020
0
Tungsten (W), % 0
14 to 16
Vanadium (V), % 0 to 0.1
0.4 to 0.6