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Austempered Cast Iron vs. SAE-AISI M4 Steel

Both austempered cast iron and SAE-AISI M4 steel are iron alloys. They have 81% 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 M4 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
76
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1380
1610
Melting Onset (Solidus), °C 1340
1560
Specific Heat Capacity, J/kg-K 490
440
Thermal Conductivity, W/m-K 42
25
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
25
Density, g/cm3 7.5
8.3
Embodied Carbon, kg CO2/kg material 1.8
14
Embodied Energy, MJ/kg 25
210
Embodied Water, L/kg 48
110

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 32 to 66
26 to 72
Strength to Weight: Bending, points 27 to 44
23 to 45
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 25 to 53
24 to 68

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Arsenic (As), % 0 to 0.020
0
Carbon (C), % 3.4 to 3.8
1.3 to 1.4
Chromium (Cr), % 0 to 0.1
3.8 to 4.8
Copper (Cu), % 0 to 0.8
0 to 0.25
Iron (Fe), % 89.6 to 94
75.9 to 81.4
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
4.3 to 5.5
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
0.2 to 0.45
Sulfur (S), % 0 to 0.020
0 to 0.030
Tin (Sn), % 0 to 0.020
0
Tungsten (W), % 0
5.3 to 6.5
Vanadium (V), % 0 to 0.1
3.8 to 4.5