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Austempered Cast Iron vs. S44625 Stainless Steel

Both austempered cast iron and S44625 stainless steel are iron alloys. They have 73% 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 austempered cast iron and the bottom bar is S44625 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Elongation at Break, % 1.1 to 13
22
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 62 to 69
80
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
590
Tensile Strength: Yield (Proof), MPa 560 to 1460
360

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1380
1440
Melting Onset (Solidus), °C 1340
1400
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
14
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
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
110
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
310
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 32 to 66
21
Strength to Weight: Bending, points 27 to 44
20
Thermal Diffusivity, mm2/s 11
4.6
Thermal Shock Resistance, points 25 to 53
19

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 0.010
Chromium (Cr), % 0 to 0.1
25 to 27.5
Copper (Cu), % 0 to 0.8
0 to 0.2
Iron (Fe), % 89.6 to 94
69.4 to 74.3
Magnesium (Mg), % 0 to 0.040
0
Manganese (Mn), % 0.3 to 0.4
0 to 0.4
Molybdenum (Mo), % 0 to 0.3
0.75 to 1.5
Nickel (Ni), % 0 to 2.0
0 to 0.5
Nitrogen (N), % 0
0 to 0.015
Phosphorus (P), % 0 to 0.040
0 to 0.020
Selenium (Se), % 0 to 0.030
0
Silicon (Si), % 2.3 to 2.7
0 to 0.4
Sulfur (S), % 0 to 0.020
0 to 0.020
Tin (Sn), % 0 to 0.020
0
Vanadium (V), % 0 to 0.1
0