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S21904 Stainless Steel vs. Austempered Cast Iron

Both S21904 stainless steel and austempered cast iron are iron alloys. They have 65% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is S21904 stainless steel and the bottom bar is austempered cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 210 to 300
270 to 490
Elastic (Young's, Tensile) Modulus, GPa 200
180
Elongation at Break, % 17 to 51
1.1 to 13
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
62 to 69
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
860 to 1800
Tensile Strength: Yield (Proof), MPa 390 to 910
560 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1400
1380
Melting Onset (Solidus), °C 1350
1340
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 14
42
Thermal Expansion, µm/m-K 17
13

Otherwise Unclassified Properties

Base Metal Price, % relative 15
2.9
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 3.0
1.8
Embodied Energy, MJ/kg 43
25
Embodied Water, L/kg 160
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
19 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
880 to 3970
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 25 to 36
32 to 66
Strength to Weight: Bending, points 23 to 29
27 to 44
Thermal Diffusivity, mm2/s 3.8
11
Thermal Shock Resistance, points 15 to 21
25 to 53

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.020
Carbon (C), % 0 to 0.040
3.4 to 3.8
Chromium (Cr), % 19 to 21.5
0 to 0.1
Copper (Cu), % 0
0 to 0.8
Iron (Fe), % 59.5 to 67.4
89.6 to 94
Magnesium (Mg), % 0
0 to 0.040
Manganese (Mn), % 8.0 to 10
0.3 to 0.4
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 5.5 to 7.5
0 to 2.0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0 to 0.040
Selenium (Se), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
2.3 to 2.7
Sulfur (S), % 0 to 0.030
0 to 0.020
Tin (Sn), % 0
0 to 0.020
Vanadium (V), % 0
0 to 0.1