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ASTM B780 Alloy vs. CR005A Copper

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while CR005A copper belongs to the copper alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 16 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 ASTM B780 alloy and the bottom bar is CR005A copper.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
120
Elongation at Break, % 1.1 to 9.1
15
Poisson's Ratio 0.36
0.34
Shear Modulus, GPa 30
43
Tensile Strength: Ultimate (UTS), MPa 330 to 590
230

Thermal Properties

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 70 to 76
100
Electrical Conductivity: Equal Weight (Specific), % IACS 62 to 68
100

Otherwise Unclassified Properties

Density, g/cm3 10
9.0

Common Calculations

Stiffness to Weight: Axial, points 4.5
7.2
Stiffness to Weight: Bending, points 14
18
Strength to Weight: Axial, points 9.1 to 16
7.1
Strength to Weight: Bending, points 11 to 15
9.3
Thermal Shock Resistance, points 16 to 29
8.1

Alloy Composition

Cadmium (Cd), % 0 to 0.050
0
Copper (Cu), % 23.5 to 25.7
99.9 to 100
Iron (Fe), % 0 to 0.050
0
Lead (Pb), % 0 to 0.030
0
Nickel (Ni), % 0.35 to 0.65
0
Oxygen (O), % 0
0 to 0.040
Silver (Ag), % 74 to 76
0 to 0.015
Zinc (Zn), % 0 to 0.060
0