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SAE-AISI A4 Steel vs. Ductile Cast Iron

Both SAE-AISI A4 steel and ductile cast iron are iron alloys. They have a very 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 (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A4 steel and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
170 to 180
Poisson's Ratio 0.29
0.28 to 0.31
Shear Modulus, GPa 73
64 to 70
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
460 to 920

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1450
1160
Melting Onset (Solidus), °C 1410
1120
Specific Heat Capacity, J/kg-K 470
490
Thermal Conductivity, W/m-K 40
31 to 36
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.8 to 9.4

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
1.9
Density, g/cm3 7.8
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 1.8
1.5
Embodied Energy, MJ/kg 24
21
Embodied Water, L/kg 59
43

Common Calculations

Stiffness to Weight: Axial, points 13
12 to 14
Stiffness to Weight: Bending, points 24
24 to 26
Strength to Weight: Axial, points 25 to 73
17 to 35
Strength to Weight: Bending, points 23 to 46
18 to 29
Thermal Diffusivity, mm2/s 11
8.9 to 10
Thermal Shock Resistance, points 23 to 67
17 to 35

Alloy Composition

Carbon (C), % 1.0 to 1.1
3.0 to 3.5
Chromium (Cr), % 0.9 to 2.2
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 92 to 95.5
93.7 to 95.5
Manganese (Mn), % 1.8 to 2.2
0
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.080
Silicon (Si), % 0 to 0.5
1.5 to 2.8
Sulfur (S), % 0 to 0.030
0

Comparable Variants