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SAE-AISI M2 Steel vs. Austempered Cast Iron

Both SAE-AISI M2 steel and austempered cast iron are iron alloys. They have 83% 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 M2 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 77
62 to 69
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
860 to 1800

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1610
1380
Melting Onset (Solidus), °C 1570
1340
Specific Heat Capacity, J/kg-K 440
490
Thermal Conductivity, W/m-K 22
42
Thermal Expansion, µm/m-K 10
13

Otherwise Unclassified Properties

Base Metal Price, % relative 24
2.9
Density, g/cm3 8.4
7.5
Embodied Carbon, kg CO2/kg material 8.8
1.8
Embodied Energy, MJ/kg 130
25
Embodied Water, L/kg 98
48

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
32 to 66
Strength to Weight: Bending, points 22 to 44
27 to 44
Thermal Diffusivity, mm2/s 5.9
11
Thermal Shock Resistance, points 27 to 76
25 to 53

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.020
Carbon (C), % 0.78 to 1.1
3.4 to 3.8
Chromium (Cr), % 3.8 to 4.5
0 to 0.1
Copper (Cu), % 0 to 0.25
0 to 0.8
Iron (Fe), % 78.5 to 83.4
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), % 4.5 to 5.5
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 0.45
2.3 to 2.7
Sulfur (S), % 0 to 0.030
0 to 0.020
Tin (Sn), % 0
0 to 0.020
Tungsten (W), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0 to 0.1