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C28000 Muntz Metal vs. R30021 Cobalt

C28000 Muntz Metal belongs to the copper alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is C28000 Muntz Metal and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
220
Elongation at Break, % 10 to 45
9.0
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 330 to 610
700
Tensile Strength: Yield (Proof), MPa 150 to 370
500

Thermal Properties

Latent Heat of Fusion, J/g 170
330
Melting Completion (Liquidus), °C 900
1350
Melting Onset (Solidus), °C 900
1190
Specific Heat Capacity, J/kg-K 390
450
Thermal Conductivity, W/m-K 120
15
Thermal Expansion, µm/m-K 21
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 28
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 31
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.0
8.4
Embodied Carbon, kg CO2/kg material 2.7
8.0
Embodied Energy, MJ/kg 46
110
Embodied Water, L/kg 320
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 240
57
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 670
570
Stiffness to Weight: Axial, points 7.2
15
Stiffness to Weight: Bending, points 20
24
Strength to Weight: Axial, points 11 to 21
23
Strength to Weight: Bending, points 13 to 20
21
Thermal Diffusivity, mm2/s 40
3.8
Thermal Shock Resistance, points 11 to 20
21

Alloy Composition

Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 59 to 63
0
Iron (Fe), % 0 to 0.070
0 to 3.0
Lead (Pb), % 0 to 0.3
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Silicon (Si), % 0
0 to 1.5
Zinc (Zn), % 36.3 to 41
0
Residuals, % 0 to 0.3
0