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R31538 Cobalt vs. Type 3 Magnetic Alloy

R31538 cobalt belongs to the cobalt alloys classification, while Type 3 magnetic alloy belongs to the nickel alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is Type 3 magnetic alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
180
Elongation at Break, % 13 to 23
43
Fatigue Strength, MPa 310 to 480
170
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 86
70
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
550
Tensile Strength: Yield (Proof), MPa 580 to 930
210

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1370
Melting Onset (Solidus), °C 1290
1320
Specific Heat Capacity, J/kg-K 450
450
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.7
Embodied Carbon, kg CO2/kg material 8.1
8.7
Embodied Energy, MJ/kg 110
120
Embodied Water, L/kg 530
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
190
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
120
Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 34 to 45
18
Strength to Weight: Bending, points 27 to 32
17
Thermal Shock Resistance, points 25 to 33
18

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.050
Chromium (Cr), % 26 to 30
2.0 to 3.0
Cobalt (Co), % 58.7 to 68.9
0 to 0.5
Copper (Cu), % 0
4.0 to 6.0
Iron (Fe), % 0 to 0.75
9.9 to 19
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 1.0
75 to 78
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.020