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C12900 Copper vs. ASTM B780 Alloy

C12900 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 C12900 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, % 2.8 to 50
1.1 to 9.1
Poisson's Ratio 0.34
0.36
Shear Modulus, GPa 43
30
Shear Strength, MPa 150 to 210
200 to 340
Tensile Strength: Ultimate (UTS), MPa 220 to 420
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 98
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 98
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 9.0
10

Common Calculations

Stiffness to Weight: Axial, points 7.2
4.5
Stiffness to Weight: Bending, points 18
14
Strength to Weight: Axial, points 6.8 to 13
9.1 to 16
Strength to Weight: Bending, points 9.1 to 14
11 to 15
Thermal Shock Resistance, points 7.8 to 15
16 to 29

Alloy Composition

Antimony (Sb), % 0 to 0.0030
0
Arsenic (As), % 0 to 0.012
0
Bismuth (Bi), % 0 to 0.0030
0
Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 99.88 to 100
23.5 to 25.7
Iron (Fe), % 0
0 to 0.050
Lead (Pb), % 0 to 0.0040
0 to 0.030
Nickel (Ni), % 0 to 0.050
0.35 to 0.65
Silver (Ag), % 0 to 0.054
74 to 76
Tellurium (Te), % 0 to 0.025
0
Zinc (Zn), % 0
0 to 0.060