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CC755S Brass vs. R30021 Cobalt

CC755S brass 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 (6, in this case) are not shown.

For each property being compared, the top bar is CC755S brass and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
220
Elongation at Break, % 9.5
9.0
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 390
700
Tensile Strength: Yield (Proof), MPa 250
500

Thermal Properties

Latent Heat of Fusion, J/g 170
330
Melting Completion (Liquidus), °C 820
1350
Melting Onset (Solidus), °C 780
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 27
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 30
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 2.7
8.0
Embodied Energy, MJ/kg 46
110
Embodied Water, L/kg 330
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 33
57
Resilience: Unit (Modulus of Resilience), kJ/m3 290
570
Stiffness to Weight: Axial, points 7.1
15
Stiffness to Weight: Bending, points 19
24
Strength to Weight: Axial, points 14
23
Strength to Weight: Bending, points 15
21
Thermal Diffusivity, mm2/s 38
3.8
Thermal Shock Resistance, points 13
21

Alloy Composition

Aluminum (Al), % 0.4 to 0.7
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 59.5 to 61
0
Iron (Fe), % 0.050 to 0.2
0 to 3.0
Lead (Pb), % 1.2 to 1.7
0
Manganese (Mn), % 0 to 0.050
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.2
2.0 to 3.0
Silicon (Si), % 0 to 0.050
0 to 1.5
Tin (Sn), % 0 to 0.3
0
Zinc (Zn), % 35.8 to 38.9
0