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AISI 409 Stainless Steel vs. Austempered Cast Iron

Both AISI 409 stainless steel and austempered cast iron are iron alloys. They have 88% of their average alloy composition in common. There are 25 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 AISI 409 stainless steel and the bottom bar is austempered cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
180
Elongation at Break, % 24
1.1 to 13
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
62 to 69
Tensile Strength: Ultimate (UTS), MPa 420
860 to 1800
Tensile Strength: Yield (Proof), MPa 200
560 to 1460

Thermal Properties

Latent Heat of Fusion, J/g 270
280
Melting Completion (Liquidus), °C 1450
1380
Melting Onset (Solidus), °C 1400
1340
Specific Heat Capacity, J/kg-K 480
490
Thermal Conductivity, W/m-K 25
42
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
2.9
Density, g/cm3 7.7
7.5
Embodied Carbon, kg CO2/kg material 2.0
1.8
Embodied Energy, MJ/kg 28
25
Embodied Water, L/kg 94
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 83
19 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 100
880 to 3970
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 15
32 to 66
Strength to Weight: Bending, points 16
27 to 44
Thermal Diffusivity, mm2/s 6.7
11
Thermal Shock Resistance, points 15
25 to 53

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Arsenic (As), % 0
0 to 0.020
Carbon (C), % 0 to 0.080
3.4 to 3.8
Chromium (Cr), % 10.5 to 11.7
0 to 0.1
Copper (Cu), % 0
0 to 0.8
Iron (Fe), % 84.9 to 89.5
89.6 to 94
Magnesium (Mg), % 0
0 to 0.040
Manganese (Mn), % 0 to 1.0
0.3 to 0.4
Molybdenum (Mo), % 0
0 to 0.3
Nickel (Ni), % 0 to 0.5
0 to 2.0
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
Titanium (Ti), % 0 to 0.75
0
Vanadium (V), % 0
0 to 0.1