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C18400 Copper vs. ASTM B780 Alloy

C18400 copper belongs to the copper alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 17 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is C18400 copper and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
83
Elongation at Break, % 13 to 50
1.1 to 9.1
Poisson's Ratio 0.34
0.36
Shear Modulus, GPa 44
30
Shear Strength, MPa 190 to 310
200 to 340
Tensile Strength: Ultimate (UTS), MPa 270 to 490
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 210
140
Specific Heat Capacity, J/kg-K 390
270
Thermal Expansion, µm/m-K 17
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 80
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 81
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 8.9
10

Common Calculations

Stiffness to Weight: Axial, points 7.3
4.5
Stiffness to Weight: Bending, points 18
14
Strength to Weight: Axial, points 8.5 to 15
9.1 to 16
Strength to Weight: Bending, points 10 to 16
11 to 15
Thermal Shock Resistance, points 9.6 to 17
16 to 29

Alloy Composition

Arsenic (As), % 0 to 0.0050
0
Cadmium (Cd), % 0
0 to 0.050
Calcium (Ca), % 0 to 0.0050
0
Chromium (Cr), % 0.4 to 1.2
0
Copper (Cu), % 97.2 to 99.6
23.5 to 25.7
Iron (Fe), % 0 to 0.15
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Lithium (Li), % 0 to 0.050
0
Nickel (Ni), % 0
0.35 to 0.65
Phosphorus (P), % 0 to 0.050
0
Silicon (Si), % 0 to 0.1
0
Silver (Ag), % 0
74 to 76
Zinc (Zn), % 0 to 0.7
0 to 0.060
Residuals, % 0 to 0.5
0