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Austempered Cast Iron vs. S21800 Stainless Steel

Both austempered cast iron and S21800 stainless steel are iron alloys. They have 66% of their average alloy composition in common. There are 24 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 S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270 to 490
210
Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 1.1 to 13
40
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 62 to 69
75
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
740
Tensile Strength: Yield (Proof), MPa 560 to 1460
390

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Melting Completion (Liquidus), °C 1380
1360
Melting Onset (Solidus), °C 1340
1310
Specific Heat Capacity, J/kg-K 490
500
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
15
Density, g/cm3 7.5
7.5
Embodied Carbon, kg CO2/kg material 1.8
3.1
Embodied Energy, MJ/kg 25
45
Embodied Water, L/kg 48
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
250
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
390
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
26
Strength to Weight: Axial, points 32 to 66
27
Strength to Weight: Bending, points 27 to 44
24
Thermal Shock Resistance, points 25 to 53
17

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 0.1
Chromium (Cr), % 0 to 0.1
16 to 18
Copper (Cu), % 0 to 0.8
0
Iron (Fe), % 89.6 to 94
59.1 to 65.4
Magnesium (Mg), % 0 to 0.040
0
Manganese (Mn), % 0.3 to 0.4
7.0 to 9.0
Molybdenum (Mo), % 0 to 0.3
0
Nickel (Ni), % 0 to 2.0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0 to 0.040
0 to 0.060
Selenium (Se), % 0 to 0.030
0
Silicon (Si), % 2.3 to 2.7
3.5 to 4.5
Sulfur (S), % 0 to 0.020
0 to 0.030
Tin (Sn), % 0 to 0.020
0
Vanadium (V), % 0 to 0.1
0