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Automotive Malleable Cast Iron vs. SAE-AISI H21 Steel

Both automotive malleable cast iron and SAE-AISI H21 steel are iron alloys. They have a moderately high 92% of their average alloy composition in common. There are 21 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is automotive malleable cast iron and the bottom bar is SAE-AISI H21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 70
76
Tensile Strength: Ultimate (UTS), MPa 350 to 720
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1410
1630
Melting Onset (Solidus), °C 1370
1580
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 41
27
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
23
Density, g/cm3 7.6
8.5
Embodied Carbon, kg CO2/kg material 1.5
4.5
Embodied Energy, MJ/kg 20
68
Embodied Water, L/kg 45
72

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 13 to 26
23 to 58
Strength to Weight: Bending, points 14 to 24
21 to 38
Thermal Diffusivity, mm2/s 11
7.1
Thermal Shock Resistance, points 9.9 to 21
24 to 59

Alloy Composition

Carbon (C), % 2.2 to 2.9
0.28 to 0.36
Chromium (Cr), % 0
3.0 to 3.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 93.6 to 96.7
87.6 to 93.8
Manganese (Mn), % 0.15 to 1.3
0.15 to 0.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0.020 to 0.15
0 to 0.030
Silicon (Si), % 0.9 to 1.9
0.15 to 0.5
Sulfur (S), % 0.020 to 0.2
0 to 0.030
Tungsten (W), % 0
8.5 to 10
Vanadium (V), % 0
0.3 to 0.6

Comparable Variants