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R31538 Cobalt vs. R30008 Cobalt

Both R31538 cobalt and R30008 cobalt are cobalt alloys. They have 68% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is R30008 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 23
1.1 to 73
Fatigue Strength, MPa 310 to 480
320 to 530
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
83
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
950 to 1700
Tensile Strength: Yield (Proof), MPa 580 to 930
500 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
450
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.1
8.1
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 530
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
590 to 2720
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
31 to 56
Strength to Weight: Bending, points 27 to 32
25 to 37
Thermal Shock Resistance, points 25 to 33
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 0.15 to 0.35
0 to 0.15
Chromium (Cr), % 26 to 30
18.5 to 21.5
Cobalt (Co), % 58.7 to 68.9
39 to 42
Iron (Fe), % 0 to 0.75
7.6 to 20
Manganese (Mn), % 0 to 1.0
1.0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
6.5 to 7.5
Nickel (Ni), % 0 to 1.0
15 to 18
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 1.2
Sulfur (S), % 0
0 to 0.015

Comparable Variants