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R31537 Cobalt vs. R30016 Cobalt

Both R31537 cobalt and R30016 cobalt are cobalt alloys. They have 89% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is R31537 cobalt and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 14 to 23
8.4
Fatigue Strength, MPa 310 to 480
290
Poisson's Ratio 0.29
0.28
Reduction in Area, % 13 to 23
8.0
Rockwell C Hardness 25 to 35
37
Shear Modulus, GPa 87
85
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
1010
Tensile Strength: Yield (Proof), MPa 590 to 940
580

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1360
Melting Onset (Solidus), °C 1290
1270
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.5
Embodied Carbon, kg CO2/kg material 8.1
7.7
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 530
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
72
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
770
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33 to 44
33
Strength to Weight: Bending, points 26 to 32
26
Thermal Diffusivity, mm2/s 3.4
3.9
Thermal Shock Resistance, points 24 to 32
24

Alloy Composition

Carbon (C), % 0 to 0.14
0.9 to 1.4
Chromium (Cr), % 26 to 30
28 to 32
Cobalt (Co), % 58.9 to 69
49.6 to 66.9
Iron (Fe), % 0 to 0.75
0 to 3.0
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0 to 1.5
Nickel (Ni), % 0 to 1.0
0 to 3.0
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Tungsten (W), % 0
3.5 to 5.5