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C18700 Copper vs. C34500 Brass

Both C18700 copper and C34500 brass are copper alloys. They have 65% of their average alloy composition in common.

For each property being compared, the top bar is C18700 copper and the bottom bar is C34500 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
100
Elongation at Break, % 9.0 to 9.6
12 to 28
Poisson's Ratio 0.34
0.31
Shear Modulus, GPa 43
40
Shear Strength, MPa 170 to 190
220 to 260
Tensile Strength: Ultimate (UTS), MPa 290 to 330
340 to 430
Tensile Strength: Yield (Proof), MPa 230 to 250
120 to 180

Thermal Properties

Latent Heat of Fusion, J/g 210
170
Maximum Temperature: Mechanical, °C 200
120
Melting Completion (Liquidus), °C 1080
910
Melting Onset (Solidus), °C 950
890
Specific Heat Capacity, J/kg-K 380
380
Thermal Conductivity, W/m-K 380
120
Thermal Expansion, µm/m-K 17
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 98
26
Electrical Conductivity: Equal Weight (Specific), % IACS 99
29

Otherwise Unclassified Properties

Base Metal Price, % relative 30
24
Density, g/cm3 9.0
8.2
Embodied Carbon, kg CO2/kg material 2.6
2.6
Embodied Energy, MJ/kg 41
45
Embodied Water, L/kg 310
320

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 29
42 to 75
Resilience: Unit (Modulus of Resilience), kJ/m3 240 to 280
69 to 160
Stiffness to Weight: Axial, points 7.1
7.1
Stiffness to Weight: Bending, points 18
19
Strength to Weight: Axial, points 9.0 to 10
12 to 15
Strength to Weight: Bending, points 11 to 12
13 to 16
Thermal Diffusivity, mm2/s 110
37
Thermal Shock Resistance, points 10 to 12
11 to 14

Alloy Composition

Copper (Cu), % 98 to 99.2
62 to 65
Iron (Fe), % 0
0 to 0.15
Lead (Pb), % 0.8 to 1.5
1.5 to 2.5
Zinc (Zn), % 0
32 to 36.5
Residuals, % 0
0 to 0.4

Comparable Variants