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C91700 Bronze vs. R30021 Cobalt

C91700 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 C91700 bronze and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Elongation at Break, % 13
9.0
Poisson's Ratio 0.34
0.29
Shear Modulus, GPa 41
86
Tensile Strength: Ultimate (UTS), MPa 330
700
Tensile Strength: Yield (Proof), MPa 170
500

Thermal Properties

Latent Heat of Fusion, J/g 190
330
Melting Completion (Liquidus), °C 1020
1350
Melting Onset (Solidus), °C 850
1190
Specific Heat Capacity, J/kg-K 370
450
Thermal Conductivity, W/m-K 71
15
Thermal Expansion, µm/m-K 18
11

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.7
8.4
Embodied Carbon, kg CO2/kg material 3.9
8.0
Embodied Energy, MJ/kg 63
110
Embodied Water, L/kg 400
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 35
57
Resilience: Unit (Modulus of Resilience), kJ/m3 140
570
Stiffness to Weight: Axial, points 6.9
15
Stiffness to Weight: Bending, points 18
24
Strength to Weight: Axial, points 11
23
Strength to Weight: Bending, points 12
21
Thermal Diffusivity, mm2/s 22
3.8
Thermal Shock Resistance, points 12
21

Alloy Composition

Aluminum (Al), % 0 to 0.0050
0
Antimony (Sb), % 0 to 0.2
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), % 84.2 to 87.5
0
Iron (Fe), % 0 to 0.2
0 to 3.0
Lead (Pb), % 0 to 0.25
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 1.2 to 2.0
2.0 to 3.0
Phosphorus (P), % 0 to 0.3
0
Silicon (Si), % 0 to 0.0050
0 to 1.5
Sulfur (S), % 0 to 0.050
0
Tin (Sn), % 11.3 to 12.5
0
Zinc (Zn), % 0 to 0.25
0