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R31233 Cobalt vs. R30155 Cobalt

R31233 cobalt belongs to the cobalt alloys classification, while R30155 cobalt belongs to the iron alloys. They have 59% of their average alloy composition in common. There are 25 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 R31233 cobalt and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 17
34
Fatigue Strength, MPa 220
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 85
81
Tensile Strength: Ultimate (UTS), MPa 1020
850
Tensile Strength: Yield (Proof), MPa 420
390

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1350
1470
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 12
12
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.5
Embodied Carbon, kg CO2/kg material 8.4
9.7
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 480
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
230
Resilience: Unit (Modulus of Resilience), kJ/m3 410
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 33
28
Strength to Weight: Bending, points 26
24
Thermal Diffusivity, mm2/s 3.2
3.2
Thermal Shock Resistance, points 25
21

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.080 to 0.16
Chromium (Cr), % 23.5 to 27.5
20 to 22.5
Cobalt (Co), % 44.7 to 63.3
18.5 to 21
Iron (Fe), % 1.0 to 5.0
24.3 to 36.2
Manganese (Mn), % 0.1 to 1.5
1.0 to 2.0
Molybdenum (Mo), % 4.0 to 6.0
2.5 to 3.5
Nickel (Ni), % 7.0 to 11
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0.030 to 0.12
0 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.050 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 1.0 to 3.0
2.0 to 3.0