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ASTM B780 Alloy vs. C38500 Bronze

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while C38500 bronze 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 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is ASTM B780 alloy and the bottom bar is C38500 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
100
Elongation at Break, % 1.1 to 9.1
17
Poisson's Ratio 0.36
0.31
Shear Modulus, GPa 30
37
Shear Strength, MPa 200 to 340
230
Tensile Strength: Ultimate (UTS), MPa 330 to 590
370

Thermal Properties

Latent Heat of Fusion, J/g 140
160
Specific Heat Capacity, J/kg-K 270
380
Thermal Expansion, µm/m-K 18
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 70 to 76
28
Electrical Conductivity: Equal Weight (Specific), % IACS 62 to 68
31

Otherwise Unclassified Properties

Density, g/cm3 10
8.1

Common Calculations

Stiffness to Weight: Axial, points 4.5
7.0
Stiffness to Weight: Bending, points 14
19
Strength to Weight: Axial, points 9.1 to 16
13
Strength to Weight: Bending, points 11 to 15
14
Thermal Shock Resistance, points 16 to 29
12

Alloy Composition

Cadmium (Cd), % 0 to 0.050
0
Copper (Cu), % 23.5 to 25.7
55 to 59
Iron (Fe), % 0 to 0.050
0 to 0.35
Lead (Pb), % 0 to 0.030
2.5 to 3.5
Nickel (Ni), % 0.35 to 0.65
0
Silver (Ag), % 74 to 76
0
Zinc (Zn), % 0 to 0.060
36.7 to 42.5
Residuals, % 0
0 to 0.5