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Automotive Malleable Cast Iron vs. SAE-AISI 4161 Steel

Both automotive malleable cast iron and SAE-AISI 4161 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is automotive malleable cast iron and the bottom bar is SAE-AISI 4161 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 130 to 290
200
Elastic (Young's, Tensile) Modulus, GPa 180
190
Elongation at Break, % 1.0 to 10
20
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 70
73
Tensile Strength: Ultimate (UTS), MPa 350 to 720
680
Tensile Strength: Yield (Proof), MPa 220 to 590
410

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1410
1460
Melting Onset (Solidus), °C 1370
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 41
43
Thermal Expansion, µm/m-K 14
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.5
Density, g/cm3 7.6
7.8
Embodied Carbon, kg CO2/kg material 1.5
1.5
Embodied Energy, MJ/kg 20
20
Embodied Water, L/kg 45
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 30
120
Resilience: Unit (Modulus of Resilience), kJ/m3 130 to 950
460
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 13 to 26
24
Strength to Weight: Bending, points 14 to 24
22
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 9.9 to 21
22

Alloy Composition

Carbon (C), % 2.2 to 2.9
0.56 to 0.64
Chromium (Cr), % 0
0.7 to 0.9
Iron (Fe), % 93.6 to 96.7
96.7 to 97.6
Manganese (Mn), % 0.15 to 1.3
0.75 to 1.0
Molybdenum (Mo), % 0
0.25 to 0.35
Phosphorus (P), % 0.020 to 0.15
0 to 0.035
Silicon (Si), % 0.9 to 1.9
0.15 to 0.35
Sulfur (S), % 0.020 to 0.2
0 to 0.040