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SAE-AISI M4 Steel vs. Ductile Cast Iron

Both SAE-AISI M4 steel and ductile cast iron are iron alloys. They have 80% 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 SAE-AISI M4 steel and the bottom bar is ductile cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
170 to 180
Poisson's Ratio 0.29
0.28 to 0.31
Shear Modulus, GPa 76
64 to 70
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
460 to 920

Thermal Properties

Latent Heat of Fusion, J/g 260
270
Melting Completion (Liquidus), °C 1610
1160
Melting Onset (Solidus), °C 1560
1120
Specific Heat Capacity, J/kg-K 440
490
Thermal Conductivity, W/m-K 25
31 to 36
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Base Metal Price, % relative 25
1.9
Density, g/cm3 8.3
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 14
1.5
Embodied Energy, MJ/kg 210
21
Embodied Water, L/kg 110
43

Common Calculations

Stiffness to Weight: Axial, points 13
12 to 14
Stiffness to Weight: Bending, points 23
24 to 26
Strength to Weight: Axial, points 26 to 72
17 to 35
Strength to Weight: Bending, points 23 to 45
18 to 29
Thermal Diffusivity, mm2/s 6.9
8.9 to 10
Thermal Shock Resistance, points 24 to 68
17 to 35

Alloy Composition

Carbon (C), % 1.3 to 1.4
3.0 to 3.5
Chromium (Cr), % 3.8 to 4.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
93.7 to 95.5
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.3 to 5.5
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.080
Silicon (Si), % 0.2 to 0.45
1.5 to 2.8
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0

Comparable Variants