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G-CoCr28 Cobalt vs. R30021 Cobalt

Both G-CoCr28 cobalt and R30021 cobalt are cobalt alloys. They have 82% of their average alloy composition in common. There are 25 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 G-CoCr28 cobalt and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 6.7
9.0
Fatigue Strength, MPa 130
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 83
86
Tensile Strength: Ultimate (UTS), MPa 560
700
Tensile Strength: Yield (Proof), MPa 260
500

Thermal Properties

Latent Heat of Fusion, J/g 320
330
Melting Completion (Liquidus), °C 1330
1350
Melting Onset (Solidus), °C 1270
1190
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 8.5
15
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 6.2
8.0
Embodied Energy, MJ/kg 84
110
Embodied Water, L/kg 440
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
57
Resilience: Unit (Modulus of Resilience), kJ/m3 160
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
23
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 2.2
3.8
Thermal Shock Resistance, points 14
21

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.2 to 0.35
Chromium (Cr), % 27 to 30
26 to 29
Cobalt (Co), % 48 to 52
61.7 to 67.3
Iron (Fe), % 9.7 to 24.5
0 to 3.0
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
4.5 to 6.0
Nickel (Ni), % 0 to 4.0
2.0 to 3.0
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0.5 to 1.5
0 to 1.5
Sulfur (S), % 0 to 0.030
0