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SAE-AISI H24 Steel vs. R31538 Cobalt

SAE-AISI H24 steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 20 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 H24 steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
86
Tensile Strength: Ultimate (UTS), MPa 720 to 1990
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 240
320
Melting Completion (Liquidus), °C 1750
1360
Melting Onset (Solidus), °C 1700
1290
Specific Heat Capacity, J/kg-K 420
450
Thermal Conductivity, W/m-K 27
13
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.4
Embodied Carbon, kg CO2/kg material 6.1
8.1
Embodied Energy, MJ/kg 93
110
Embodied Water, L/kg 78
530

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 22 to 61
34 to 45
Strength to Weight: Bending, points 20 to 39
27 to 32
Thermal Diffusivity, mm2/s 6.9
3.5
Thermal Shock Resistance, points 22 to 61
25 to 33

Alloy Composition

Carbon (C), % 0.42 to 0.53
0.15 to 0.35
Chromium (Cr), % 2.5 to 3.5
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78 to 82.4
0 to 0.75
Manganese (Mn), % 0.15 to 0.4
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.15 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0.4 to 0.6
0

Comparable Variants