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Annealed R30008 Cobalt vs. Annealed Type 4 Magnetic Alloy

Annealed R30008 cobalt belongs to the cobalt alloys classification, while annealed Type 4 magnetic alloy belongs to the nickel alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is annealed R30008 cobalt and the bottom bar is annealed Type 4 magnetic alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 73
40
Fatigue Strength, MPa 320
220
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 950
620
Tensile Strength: Yield (Proof), MPa 500
270

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1330
1370
Specific Heat Capacity, J/kg-K 450
440
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Base Metal Price, % relative 95
60
Density, g/cm3 8.4
8.8
Embodied Carbon, kg CO2/kg material 8.1
10
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 400
210

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590
190
Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 31
19
Strength to Weight: Bending, points 25
18
Thermal Shock Resistance, points 25
21

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0 to 0.050
Chromium (Cr), % 18.5 to 21.5
0 to 0.3
Cobalt (Co), % 39 to 42
0 to 0.5
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 7.6 to 20
9.5 to 17.5
Manganese (Mn), % 1.0 to 2.0
0 to 0.8
Molybdenum (Mo), % 6.5 to 7.5
3.5 to 6.0
Nickel (Ni), % 15 to 18
79 to 82
Phosphorus (P), % 0 to 0.015
0 to 0.010
Silicon (Si), % 0 to 1.2
0 to 0.5
Sulfur (S), % 0 to 0.015
0 to 0.020