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Austempered Cast Iron vs. SAE-AISI 4621 Steel

Both austempered cast iron and SAE-AISI 4621 steel are iron alloys. They have a moderately high 94% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is austempered cast iron and the bottom bar is SAE-AISI 4621 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 270 to 490
150
Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 1.1 to 13
27
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 62 to 69
73
Tensile Strength: Ultimate (UTS), MPa 860 to 1800
500
Tensile Strength: Yield (Proof), MPa 560 to 1460
360

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 1380
1460
Melting Onset (Solidus), °C 1340
1420
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 42
46
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Base Metal Price, % relative 2.9
3.3
Density, g/cm3 7.5
7.9
Embodied Carbon, kg CO2/kg material 1.8
1.6
Embodied Energy, MJ/kg 25
22
Embodied Water, L/kg 48
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 95
120
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 3970
340
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 32 to 66
18
Strength to Weight: Bending, points 27 to 44
18
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 25 to 53
15

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Arsenic (As), % 0 to 0.020
0
Carbon (C), % 3.4 to 3.8
0.18 to 0.23
Chromium (Cr), % 0 to 0.1
0
Copper (Cu), % 0 to 0.8
0
Iron (Fe), % 89.6 to 94
96.1 to 97.1
Magnesium (Mg), % 0 to 0.040
0
Manganese (Mn), % 0.3 to 0.4
0.7 to 0.9
Molybdenum (Mo), % 0 to 0.3
0.2 to 0.3
Nickel (Ni), % 0 to 2.0
1.7 to 2.0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Selenium (Se), % 0 to 0.030
0
Silicon (Si), % 2.3 to 2.7
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Tin (Sn), % 0 to 0.020
0
Vanadium (V), % 0 to 0.1
0