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Austempered Cast Iron vs. EN 1.4901 Stainless Steel

Both austempered cast iron and EN 1.4901 stainless steel are iron alloys. They have 89% 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 EN 1.4901 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 1.1 to 13
19
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 62 to 69
76
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
740
Tensile Strength: Yield (Proof), MPa 560 to 1460
490

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1380
1490
Melting Onset (Solidus), °C 1340
1450
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 42
26
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
11
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 1.8
2.8
Embodied Energy, MJ/kg 25
40
Embodied Water, L/kg 48
89

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
120
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
620
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 66
26
Strength to Weight: Bending, points 27 to 44
23
Thermal Diffusivity, mm2/s 11
6.9
Thermal Shock Resistance, points 25 to 53
23

Alloy Composition

Aluminum (Al), % 0 to 0.050
0 to 0.020
Arsenic (As), % 0 to 0.020
0
Boron (B), % 0
0.0010 to 0.0060
Carbon (C), % 3.4 to 3.8
0.070 to 0.13
Chromium (Cr), % 0 to 0.1
8.5 to 9.5
Copper (Cu), % 0 to 0.8
0
Iron (Fe), % 89.6 to 94
85.8 to 89.1
Magnesium (Mg), % 0 to 0.040
0
Manganese (Mn), % 0.3 to 0.4
0.3 to 0.6
Molybdenum (Mo), % 0 to 0.3
0.3 to 0.6
Nickel (Ni), % 0 to 2.0
0 to 0.4
Niobium (Nb), % 0
0.040 to 0.090
Nitrogen (N), % 0
0.030 to 0.070
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 0.5
Sulfur (S), % 0 to 0.020
0 to 0.010
Tin (Sn), % 0 to 0.020
0
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
1.5 to 2.0
Vanadium (V), % 0 to 0.1
0.15 to 0.25
Zirconium (Zr), % 0
0 to 0.010