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Grey Cast Iron vs. SAE-AISI A7 Steel

Both grey cast iron and SAE-AISI A7 steel are iron alloys. They have 88% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is grey cast iron and the bottom bar is SAE-AISI A7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 69
72
Tensile Strength: Ultimate (UTS), MPa 160 to 450
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 280
260
Melting Completion (Liquidus), °C 1380
1470
Melting Onset (Solidus), °C 1180
1430
Specific Heat Capacity, J/kg-K 490
470
Thermal Conductivity, W/m-K 46
37
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
10
Density, g/cm3 7.5
7.7
Embodied Carbon, kg CO2/kg material 1.5
13
Embodied Energy, MJ/kg 21
200
Embodied Water, L/kg 44
100

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 5.8 to 17
29 to 77
Strength to Weight: Bending, points 8.7 to 17
25 to 48
Thermal Diffusivity, mm2/s 13
10
Thermal Shock Resistance, points 6.0 to 17
27 to 72

Alloy Composition

Carbon (C), % 3.1 to 3.4
2.0 to 2.9
Chromium (Cr), % 0
5.0 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 92.1 to 93.9
81.4 to 87.7
Manganese (Mn), % 0.5 to 0.7
0 to 0.8
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.9
0 to 0.030
Silicon (Si), % 2.5 to 2.8
0 to 0.5
Sulfur (S), % 0 to 0.15
0 to 0.030
Tungsten (W), % 0
0.5 to 1.5
Vanadium (V), % 0
3.9 to 5.2