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SAE-AISI A9 Steel vs. Grey Cast Iron

Both SAE-AISI A9 steel and grey cast iron are iron alloys. They have a moderately high 91% of their average alloy composition in common. There are 23 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 SAE-AISI A9 steel and the bottom bar is grey 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
69
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
160 to 450

Thermal Properties

Latent Heat of Fusion, J/g 280
280
Melting Completion (Liquidus), °C 1460
1380
Melting Onset (Solidus), °C 1410
1180
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 35
46
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
8.9

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
1.9
Density, g/cm3 7.8
7.5
Embodied Carbon, kg CO2/kg material 4.7
1.5
Embodied Energy, MJ/kg 70
21
Embodied Water, L/kg 82
44

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
25
Strength to Weight: Axial, points 28 to 73
5.8 to 17
Strength to Weight: Bending, points 24 to 46
8.7 to 17
Thermal Diffusivity, mm2/s 9.6
13
Thermal Shock Resistance, points 25 to 66
6.0 to 17

Alloy Composition

Carbon (C), % 0.45 to 0.55
3.1 to 3.4
Chromium (Cr), % 4.8 to 5.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
92.1 to 93.9
Manganese (Mn), % 0 to 0.5
0.5 to 0.7
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 1.3 to 1.8
0
Phosphorus (P), % 0 to 0.030
0 to 0.9
Silicon (Si), % 1.0 to 1.2
2.5 to 2.8
Sulfur (S), % 0 to 0.030
0 to 0.15
Vanadium (V), % 0.8 to 1.4
0