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SAE-AISI H21 Steel vs. Ductile Cast Iron

Both SAE-AISI H21 steel and ductile cast iron are iron alloys. They have a moderately high 91% 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 H21 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 720 to 1790
460 to 920

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Melting Completion (Liquidus), °C 1630
1160
Melting Onset (Solidus), °C 1580
1120
Specific Heat Capacity, J/kg-K 440
490
Thermal Conductivity, W/m-K 27
31 to 36
Thermal Expansion, µm/m-K 11
11

Otherwise Unclassified Properties

Base Metal Price, % relative 23
1.9
Density, g/cm3 8.5
7.1 to 7.5
Embodied Carbon, kg CO2/kg material 4.5
1.5
Embodied Energy, MJ/kg 68
21
Embodied Water, L/kg 72
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 23 to 58
17 to 35
Strength to Weight: Bending, points 21 to 38
18 to 29
Thermal Diffusivity, mm2/s 7.1
8.9 to 10
Thermal Shock Resistance, points 24 to 59
17 to 35

Alloy Composition

Carbon (C), % 0.28 to 0.36
3.0 to 3.5
Chromium (Cr), % 3.0 to 3.8
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87.6 to 93.8
93.7 to 95.5
Manganese (Mn), % 0.15 to 0.4
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.080
Silicon (Si), % 0.15 to 0.5
1.5 to 2.8
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 8.5 to 10
0
Vanadium (V), % 0.3 to 0.6
0

Comparable Variants