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R30021 Cobalt vs. R30006 Cobalt

Both R30021 cobalt and R30006 cobalt are cobalt alloys. Both are furnished in the annealed condition. They have a moderately high 90% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1300
1520
Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 9.0
1.0
Fatigue Strength, MPa 250
260
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 32
40
Shear Modulus, GPa 86
85
Tensile Strength: Ultimate (UTS), MPa 700
900
Tensile Strength: Yield (Proof), MPa 500
540

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 1350
1400
Melting Onset (Solidus), °C 1190
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.7

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.6
Embodied Carbon, kg CO2/kg material 8.0
7.8
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 520
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
7.8
Resilience: Unit (Modulus of Resilience), kJ/m3 570
670
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 23
29
Strength to Weight: Bending, points 21
24
Thermal Diffusivity, mm2/s 3.8
3.9
Thermal Shock Resistance, points 21
26

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.9 to 1.4
Chromium (Cr), % 26 to 29
27 to 32
Cobalt (Co), % 61.7 to 67.3
48.6 to 68.1
Iron (Fe), % 0 to 3.0
0 to 3.0
Molybdenum (Mo), % 4.5 to 6.0
0 to 1.0
Nickel (Ni), % 2.0 to 3.0
0 to 3.0
Silicon (Si), % 0 to 1.5
0 to 2.0
Tungsten (W), % 0
4.0 to 6.0