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R31539 Cobalt vs. SAE-AISI H21 Steel

R31539 cobalt belongs to the cobalt alloys classification, while SAE-AISI H21 steel belongs to the iron 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 R31539 cobalt and the bottom bar is SAE-AISI H21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
720 to 1790

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1630
Melting Onset (Solidus), °C 1290
1580
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 13
27
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.5
Embodied Carbon, kg CO2/kg material 8.2
4.5
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 530
72

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 33 to 44
23 to 58
Strength to Weight: Bending, points 27 to 32
21 to 38
Thermal Diffusivity, mm2/s 3.5
7.1
Thermal Shock Resistance, points 24 to 32
24 to 59

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.28 to 0.36
Chromium (Cr), % 26 to 30
3.0 to 3.8
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
87.6 to 93.8
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.3
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0.15 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
8.5 to 10
Vanadium (V), % 0
0.3 to 0.6

Comparable Variants