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R31538 Cobalt vs. R30012 Cobalt

Both R31538 cobalt and R30012 cobalt are cobalt alloys. They have 86% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
220
Elongation at Break, % 13 to 23
1.0
Fatigue Strength, MPa 310 to 480
320
Poisson's Ratio 0.29
0.28
Rockwell C Hardness 25 to 35
48
Shear Modulus, GPa 86
86
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
830
Tensile Strength: Yield (Proof), MPa 580 to 930
650

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1280
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
1.8

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.8
Embodied Carbon, kg CO2/kg material 8.1
8.3
Embodied Energy, MJ/kg 110
120
Embodied Water, L/kg 530
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
960
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 34 to 45
26
Strength to Weight: Bending, points 27 to 32
22
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 25 to 33
23

Alloy Composition

Carbon (C), % 0.15 to 0.35
1.4 to 2.0
Chromium (Cr), % 26 to 30
27 to 32
Cobalt (Co), % 58.7 to 68.9
47.5 to 64.1
Iron (Fe), % 0 to 0.75
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0 to 1.0
Nickel (Ni), % 0 to 1.0
0 to 3.0
Nitrogen (N), % 0 to 0.25
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Tungsten (W), % 0
7.5 to 9.5