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R31539 Cobalt vs. SAE-AISI H25 Steel

R31539 cobalt belongs to the cobalt alloys classification, while SAE-AISI H25 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 H25 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
79
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
710 to 1620

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1750
Melting Onset (Solidus), °C 1290
1700
Specific Heat Capacity, J/kg-K 450
420
Thermal Conductivity, W/m-K 13
26
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.1
Embodied Carbon, kg CO2/kg material 8.2
6.2
Embodied Energy, MJ/kg 110
93
Embodied Water, L/kg 530
83

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 33 to 44
22 to 50
Strength to Weight: Bending, points 27 to 32
20 to 34
Thermal Diffusivity, mm2/s 3.5
6.7
Thermal Shock Resistance, points 24 to 32
22 to 49

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0.22 to 0.32
Chromium (Cr), % 26 to 30
3.8 to 4.5
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
77.2 to 81.3
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 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
14 to 16
Vanadium (V), % 0
0.4 to 0.6

Comparable Variants