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Automotive Grey Cast Iron vs. SAE-AISI H21 Steel

Both automotive grey cast iron and SAE-AISI H21 steel are iron alloys. 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 grey 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 69 to 70
76
Tensile Strength: Ultimate (UTS), MPa 140 to 290
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 260 to 280
250
Melting Completion (Liquidus), °C 1380 to 1390
1630
Melting Onset (Solidus), °C 1340 to 1350
1580
Specific Heat Capacity, J/kg-K 490
440
Thermal Conductivity, W/m-K 41 to 43
27
Thermal Expansion, µm/m-K 12 to 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9 to 3.0
23
Density, g/cm3 7.5 to 7.6
8.5
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
4.5
Embodied Energy, MJ/kg 21 to 24
68
Embodied Water, L/kg 44 to 51
72

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 5.2 to 11
23 to 58
Strength to Weight: Bending, points 8.0 to 13
21 to 38
Thermal Diffusivity, mm2/s 11 to 12
7.1
Thermal Shock Resistance, points 4.2 to 8.6
24 to 59