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Austempered Cast Iron vs. S82031 Stainless Steel

Both austempered cast iron and S82031 stainless steel are iron alloys. They have 76% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is austempered cast iron and the bottom bar is S82031 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 1.1 to 13
39
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 62 to 69
78
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
780
Tensile Strength: Yield (Proof), MPa 560 to 1460
570

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1380
1430
Melting Onset (Solidus), °C 1340
1390
Specific Heat Capacity, J/kg-K 490
480
Thermal Conductivity, W/m-K 42
15
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
13
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 1.8
2.8
Embodied Energy, MJ/kg 25
39
Embodied Water, L/kg 48
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
280
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
820
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32 to 66
28
Strength to Weight: Bending, points 27 to 44
24
Thermal Diffusivity, mm2/s 11
3.9
Thermal Shock Resistance, points 25 to 53
22

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 0.050
Chromium (Cr), % 0 to 0.1
19 to 22
Copper (Cu), % 0 to 0.8
0 to 1.0
Iron (Fe), % 89.6 to 94
68 to 78.3
Magnesium (Mg), % 0 to 0.040
0
Manganese (Mn), % 0.3 to 0.4
0 to 2.5
Molybdenum (Mo), % 0 to 0.3
0.6 to 1.4
Nickel (Ni), % 0 to 2.0
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.24
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 0.8
Sulfur (S), % 0 to 0.020
0 to 0.0050
Tin (Sn), % 0 to 0.020
0
Vanadium (V), % 0 to 0.1
0