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SAE-AISI S7 Steel vs. Automotive Malleable Cast Iron

Both SAE-AISI S7 steel and automotive malleable cast iron are iron alloys. They have a moderately high 95% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S7 steel and the bottom bar is automotive malleable cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
70
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
350 to 720

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1460
1410
Melting Onset (Solidus), °C 1420
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 40
41
Thermal Expansion, µm/m-K 12
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
1.9
Density, g/cm3 7.8
7.6
Embodied Carbon, kg CO2/kg material 2.3
1.5
Embodied Energy, MJ/kg 31
20
Embodied Water, L/kg 65
45

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 24 to 72
13 to 26
Strength to Weight: Bending, points 22 to 46
14 to 24
Thermal Diffusivity, mm2/s 11
11
Thermal Shock Resistance, points 22 to 66
9.9 to 21

Alloy Composition

Carbon (C), % 0.45 to 0.55
2.2 to 2.9
Chromium (Cr), % 3.0 to 3.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
93.6 to 96.7
Manganese (Mn), % 0.2 to 0.9
0.15 to 1.3
Molybdenum (Mo), % 1.3 to 1.8
0
Phosphorus (P), % 0 to 0.030
0.020 to 0.15
Silicon (Si), % 0.2 to 1.0
0.9 to 1.9
Sulfur (S), % 0 to 0.030
0.020 to 0.2
Vanadium (V), % 0 to 0.3
0

Comparable Variants