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C46400 Brass vs. R30021 Cobalt

C46400 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 (7, in this case) are not shown.

For each property being compared, the top bar is C46400 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, % 17 to 40
9.0
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 40
86
Tensile Strength: Ultimate (UTS), MPa 400 to 500
700
Tensile Strength: Yield (Proof), MPa 160 to 320
500

Thermal Properties

Latent Heat of Fusion, J/g 170
330
Melting Completion (Liquidus), °C 900
1350
Melting Onset (Solidus), °C 890
1190
Specific Heat Capacity, J/kg-K 380
450
Thermal Conductivity, W/m-K 120
15
Thermal Expansion, µm/m-K 21
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 29
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 47
110
Embodied Water, L/kg 330
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 76 to 140
57
Resilience: Unit (Modulus of Resilience), kJ/m3 120 to 500
570
Stiffness to Weight: Axial, points 7.2
15
Stiffness to Weight: Bending, points 20
24
Strength to Weight: Axial, points 14 to 17
23
Strength to Weight: Bending, points 15 to 17
21
Thermal Diffusivity, mm2/s 38
3.8
Thermal Shock Resistance, points 13 to 16
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 62
0
Iron (Fe), % 0 to 0.1
0 to 3.0
Lead (Pb), % 0 to 0.2
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Silicon (Si), % 0
0 to 1.5
Tin (Sn), % 0.5 to 1.0
0
Zinc (Zn), % 36.3 to 40.5
0
Residuals, % 0 to 0.4
0