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Annealed R31538 Cobalt vs. Annealed SAE-AISI M7

Annealed R31538 cobalt belongs to the cobalt alloys classification, while annealed SAE-AISI M7 belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is annealed R31538 cobalt and the bottom bar is annealed SAE-AISI M7.

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
77
Tensile Strength: Ultimate (UTS), MPa 1020
760

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1560
Melting Onset (Solidus), °C 1290
1510
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
28
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.1
8.9
Embodied Energy, MJ/kg 110
130
Embodied Water, L/kg 530
100

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34
26
Strength to Weight: Bending, points 27
23
Thermal Diffusivity, mm2/s 3.5
7.8
Thermal Shock Resistance, points 25
24

Alloy Composition

Carbon (C), % 0.15 to 0.35
1.0 to 1.1
Chromium (Cr), % 26 to 30
3.5 to 4.0
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
79.8 to 83.8
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 5.0 to 7.0
8.2 to 9.2
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
0.2 to 0.55
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.8 to 2.3