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C94400 Bronze vs. R30021 Cobalt

C94400 bronze 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 C94400 bronze and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
220
Elongation at Break, % 18
9.0
Poisson's Ratio 0.35
0.29
Shear Modulus, GPa 37
86
Tensile Strength: Ultimate (UTS), MPa 220
700
Tensile Strength: Yield (Proof), MPa 110
500

Thermal Properties

Latent Heat of Fusion, J/g 180
330
Melting Completion (Liquidus), °C 940
1350
Melting Onset (Solidus), °C 790
1190
Specific Heat Capacity, J/kg-K 350
450
Thermal Conductivity, W/m-K 52
15
Thermal Expansion, µm/m-K 19
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 9.9
2.1

Otherwise Unclassified Properties

Density, g/cm3 9.1
8.4
Embodied Carbon, kg CO2/kg material 3.4
8.0
Embodied Energy, MJ/kg 54
110
Embodied Water, L/kg 390
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 33
57
Resilience: Unit (Modulus of Resilience), kJ/m3 60
570
Stiffness to Weight: Axial, points 6.1
15
Stiffness to Weight: Bending, points 17
24
Strength to Weight: Axial, points 6.8
23
Strength to Weight: Bending, points 9.0
21
Thermal Diffusivity, mm2/s 17
3.8
Thermal Shock Resistance, points 8.3
21

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Antimony (Sb), % 0 to 0.8
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), % 76.1 to 84
0
Iron (Fe), % 0 to 0.15
0 to 3.0
Lead (Pb), % 9.0 to 12
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 1.0
2.0 to 3.0
Phosphorus (P), % 0 to 0.050
0
Silicon (Si), % 0 to 0.0050
0 to 1.5
Sulfur (S), % 0 to 0.080
0
Tin (Sn), % 7.0 to 9.0
0
Zinc (Zn), % 0 to 0.8
0