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R31538 Cobalt vs. G-CoCr28 Cobalt

Both R31538 cobalt and G-CoCr28 cobalt are cobalt alloys. They have 80% 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 R31538 cobalt and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 23
6.7
Fatigue Strength, MPa 310 to 480
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
83
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
560
Tensile Strength: Yield (Proof), MPa 580 to 930
260

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1330
Melting Onset (Solidus), °C 1290
1270
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
8.5
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.1
6.2
Embodied Energy, MJ/kg 110
84
Embodied Water, L/kg 530
440

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
31
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
160
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
19
Strength to Weight: Bending, points 27 to 32
19
Thermal Diffusivity, mm2/s 3.5
2.2
Thermal Shock Resistance, points 25 to 33
14

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.050 to 0.25
Chromium (Cr), % 26 to 30
27 to 30
Cobalt (Co), % 58.7 to 68.9
48 to 52
Iron (Fe), % 0 to 0.75
9.7 to 24.5
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
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0.5 to 1.5
Sulfur (S), % 0
0 to 0.030