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Austempered Cast Iron vs. S44660 Stainless Steel

Both austempered cast iron and S44660 stainless steel are iron alloys. They have 68% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is austempered cast iron and the bottom bar is S44660 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270 to 490
210
Elastic (Young's, Tensile) Modulus, GPa 180
210
Elongation at Break, % 1.1 to 13
20
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 62 to 69
81
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
660
Tensile Strength: Yield (Proof), MPa 560 to 1460
510

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 1380
1460
Melting Onset (Solidus), °C 1340
1410
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 42
17
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
21
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 1.8
4.3
Embodied Energy, MJ/kg 25
61
Embodied Water, L/kg 48
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
120
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
640
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32 to 66
24
Strength to Weight: Bending, points 27 to 44
22
Thermal Diffusivity, mm2/s 11
4.5
Thermal Shock Resistance, points 25 to 53
21

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Arsenic (As), % 0 to 0.020
0
Carbon (C), % 3.4 to 3.8
0 to 0.030
Chromium (Cr), % 0 to 0.1
25 to 28
Copper (Cu), % 0 to 0.8
0
Iron (Fe), % 89.6 to 94
60.4 to 71
Magnesium (Mg), % 0 to 0.040
0
Manganese (Mn), % 0.3 to 0.4
0 to 1.0
Molybdenum (Mo), % 0 to 0.3
3.0 to 4.0
Nickel (Ni), % 0 to 2.0
1.0 to 3.5
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0
0 to 0.040
Phosphorus (P), % 0 to 0.040
0 to 0.040
Selenium (Se), % 0 to 0.030
0
Silicon (Si), % 2.3 to 2.7
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tin (Sn), % 0 to 0.020
0
Titanium (Ti), % 0
0.2 to 1.0
Vanadium (V), % 0 to 0.1
0