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R31538 Cobalt vs. R30605 Cobalt

Both R31538 cobalt and R30605 cobalt are cobalt alloys. They have 73% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 23
34
Fatigue Strength, MPa 310 to 480
260 to 590
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
1130 to 1900
Tensile Strength: Yield (Proof), MPa 580 to 930
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
410
Thermal Conductivity, W/m-K 13
9.6
Thermal Expansion, µm/m-K 13
12

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.6
Embodied Carbon, kg CO2/kg material 8.1
9.8
Embodied Energy, MJ/kg 110
140
Embodied Water, L/kg 530
450

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 34 to 45
33 to 55
Strength to Weight: Bending, points 27 to 32
25 to 36
Thermal Diffusivity, mm2/s 3.5
2.5
Thermal Shock Resistance, points 25 to 33
31 to 52

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.050 to 0.15
Chromium (Cr), % 26 to 30
19 to 21
Cobalt (Co), % 58.7 to 68.9
46.4 to 57
Iron (Fe), % 0 to 0.75
0 to 3.0
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
9.0 to 11
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
14 to 16

Comparable Variants