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R31537 Cobalt vs. SAE-AISI S7 Steel

R31537 cobalt belongs to the cobalt alloys classification, while SAE-AISI S7 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R31537 cobalt and the bottom bar is SAE-AISI S7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 87
74
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
670 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
40
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.1
2.3
Embodied Energy, MJ/kg 110
31
Embodied Water, L/kg 530
65

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
24 to 72
Strength to Weight: Bending, points 26 to 32
22 to 46
Thermal Diffusivity, mm2/s 3.4
11
Thermal Shock Resistance, points 24 to 32
22 to 66

Alloy Composition

Carbon (C), % 0 to 0.14
0.45 to 0.55
Chromium (Cr), % 26 to 30
3.0 to 3.5
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
91.6 to 94.9
Manganese (Mn), % 0 to 1.0
0.2 to 0.9
Molybdenum (Mo), % 5.0 to 7.0
1.3 to 1.8
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 1.0
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0 to 0.3

Comparable Variants