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CC491K Bronze vs. CC751S Brass

Both CC491K bronze and CC751S brass are copper alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 72% of their average alloy composition in common.

For each property being compared, the top bar is CC491K bronze and the bottom bar is CC751S brass.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 73
130
Elastic (Young's, Tensile) Modulus, GPa 110
110
Elongation at Break, % 13
5.6
Poisson's Ratio 0.34
0.31
Shear Modulus, GPa 40
40
Tensile Strength: Ultimate (UTS), MPa 260
450
Tensile Strength: Yield (Proof), MPa 120
320

Thermal Properties

Latent Heat of Fusion, J/g 190
190
Maximum Temperature: Mechanical, °C 160
130
Melting Completion (Liquidus), °C 980
850
Melting Onset (Solidus), °C 900
810
Specific Heat Capacity, J/kg-K 370
390
Thermal Conductivity, W/m-K 71
110
Thermal Expansion, µm/m-K 19
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 15
25
Electrical Conductivity: Equal Weight (Specific), % IACS 15
28

Otherwise Unclassified Properties

Base Metal Price, % relative 31
24
Density, g/cm3 8.9
8.1
Embodied Carbon, kg CO2/kg material 3.1
2.8
Embodied Energy, MJ/kg 51
46
Embodied Water, L/kg 350
330

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
23
Resilience: Unit (Modulus of Resilience), kJ/m3 67
480
Stiffness to Weight: Axial, points 6.7
7.2
Stiffness to Weight: Bending, points 18
19
Strength to Weight: Axial, points 8.1
15
Strength to Weight: Bending, points 10
16
Thermal Diffusivity, mm2/s 22
35
Thermal Shock Resistance, points 9.3
15

Alloy Composition

Aluminum (Al), % 0 to 0.010
0 to 0.1
Antimony (Sb), % 0 to 0.25
0 to 0.5
Copper (Cu), % 81 to 87
62.7 to 66
Iron (Fe), % 0 to 0.3
0.25 to 0.5
Lead (Pb), % 4.0 to 6.0
0.8 to 2.2
Manganese (Mn), % 0
0 to 0.15
Nickel (Ni), % 0 to 2.0
0 to 0.8
Phosphorus (P), % 0 to 0.1
0
Silicon (Si), % 0 to 0.010
0.65 to 1.1
Sulfur (S), % 0 to 0.1
0
Tin (Sn), % 4.0 to 6.0
0 to 0.8
Zinc (Zn), % 4.0 to 6.0
27.9 to 35.6