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SAE-AISI H12 Steel vs. Automotive Malleable Cast Iron

Both SAE-AISI H12 steel and automotive malleable 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 (6, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI H12 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 75
70
Tensile Strength: Ultimate (UTS), MPa 690 to 1850
350 to 720

Thermal Properties

Latent Heat of Fusion, J/g 270
260
Melting Completion (Liquidus), °C 1480
1410
Melting Onset (Solidus), °C 1440
1370
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 36
41
Thermal Expansion, µm/m-K 12
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.3
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 9.5
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
1.9
Density, g/cm3 7.9
7.6
Embodied Carbon, kg CO2/kg material 2.9
1.5
Embodied Energy, MJ/kg 41
20
Embodied Water, L/kg 76
45

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 65
13 to 26
Strength to Weight: Bending, points 22 to 42
14 to 24
Thermal Diffusivity, mm2/s 9.8
11
Thermal Shock Resistance, points 22 to 60
9.9 to 21

Alloy Composition

Carbon (C), % 0.3 to 0.4
2.2 to 2.9
Chromium (Cr), % 4.8 to 5.5
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.8 to 91.7
93.6 to 96.7
Manganese (Mn), % 0.2 to 0.5
0.15 to 1.3
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0.020 to 0.15
Silicon (Si), % 0.8 to 1.2
0.9 to 1.9
Sulfur (S), % 0 to 0.030
0.020 to 0.2
Tungsten (W), % 1.0 to 1.7
0
Vanadium (V), % 0 to 0.5
0

Comparable Variants