MakeItFrom.com
Menu (ESC)

R30021 Cobalt vs. R30155 Cobalt

R30021 cobalt belongs to the cobalt alloys classification, while R30155 cobalt belongs to the iron alloys. They have 49% of their average alloy composition in common. There are 25 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30021 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, % 9.0
34
Fatigue Strength, MPa 250
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 700
850
Tensile Strength: Yield (Proof), MPa 500
390

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1470
Melting Onset (Solidus), °C 1190
1420
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.5
Embodied Carbon, kg CO2/kg material 8.0
9.7
Embodied Energy, MJ/kg 110
150
Embodied Water, L/kg 520
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
230
Resilience: Unit (Modulus of Resilience), kJ/m3 570
370
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 23
28
Strength to Weight: Bending, points 21
24
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 21
21

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.080 to 0.16
Chromium (Cr), % 26 to 29
20 to 22.5
Cobalt (Co), % 61.7 to 67.3
18.5 to 21
Iron (Fe), % 0 to 3.0
24.3 to 36.2
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
2.5 to 3.5
Nickel (Ni), % 2.0 to 3.0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0