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R30155 Cobalt vs. R31538 Cobalt

R30155 cobalt belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. They have 46% of their average alloy composition in common. There are 26 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30155 cobalt and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 34
13 to 23
Fatigue Strength, MPa 310
310 to 480
Poisson's Ratio 0.29
0.29
Reduction in Area, % 34
13 to 22
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 850
1020 to 1360
Tensile Strength: Yield (Proof), MPa 390
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 300
320
Melting Completion (Liquidus), °C 1470
1360
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 12
13
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Density, g/cm3 8.5
8.4
Embodied Carbon, kg CO2/kg material 9.7
8.1
Embodied Energy, MJ/kg 150
110
Embodied Water, L/kg 300
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 230
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 370
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
34 to 45
Strength to Weight: Bending, points 24
27 to 32
Thermal Diffusivity, mm2/s 3.2
3.5
Thermal Shock Resistance, points 21
25 to 33

Alloy Composition

Carbon (C), % 0.080 to 0.16
0.15 to 0.35
Chromium (Cr), % 20 to 22.5
26 to 30
Cobalt (Co), % 18.5 to 21
58.7 to 68.9
Iron (Fe), % 24.3 to 36.2
0 to 0.75
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 2.5 to 3.5
5.0 to 7.0
Nickel (Ni), % 19 to 21
0 to 1.0
Niobium (Nb), % 0.75 to 1.3
0
Nitrogen (N), % 0 to 0.2
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tantalum (Ta), % 0.75 to 1.3
0
Tungsten (W), % 2.0 to 3.0
0