Spring-tempered ASTM B617 vs. Spring-tempered ASTM B780 Alloy

Both spring-tempered ASTM B617 and spring-tempered ASTM B780 alloy are otherwise unclassified metals. Both are furnished in the spring temper. They have 85% of their average alloy composition in common. There are 18 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is spring-tempered ASTM B617 and the bottom bar is spring-tempered ASTM B780 alloy.

Spring-Tempered ASTM B617 Coin Silver Alloy Spring-Tempered ASTM B780 Silver-Copper-Nickel Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		75
Elastic (Young's, Tensile) Modulus, GPa		83

Elongation at Break, %		1.1
Elongation at Break, %		1.1

Poisson's Ratio		0.37
Poisson's Ratio		0.36

Shear Modulus, GPa		28
Shear Modulus, GPa		30

Shear Strength, MPa		290
Shear Strength, MPa		340

Tensile Strength: Ultimate (UTS), MPa		520
Tensile Strength: Ultimate (UTS), MPa		590

Thermal Properties

Latent Heat of Fusion, J/g		120
Latent Heat of Fusion, J/g		140

Melting Completion (Liquidus), °C		870
Melting Completion (Liquidus), °C		860

Specific Heat Capacity, J/kg-K		250
Specific Heat Capacity, J/kg-K		270

Thermal Expansion, µm/m-K		19
Thermal Expansion, µm/m-K		18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		83
Electrical Conductivity: Equal Volume, % IACS		70

Electrical Conductivity: Equal Weight (Specific), % IACS		72
Electrical Conductivity: Equal Weight (Specific), % IACS		62

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		4.1
Stiffness to Weight: Axial, points		4.5

Stiffness to Weight: Bending, points		14
Stiffness to Weight: Bending, points		14

Strength to Weight: Axial, points		14
Strength to Weight: Axial, points		16

Strength to Weight: Bending, points		14
Strength to Weight: Bending, points		15

Thermal Shock Resistance, points		25
Thermal Shock Resistance, points		29

Alloy Composition

Aluminum (Al), %		0 to 0.0050
Aluminum (Al), %		0

Cadmium (Cd), %		0 to 0.050
Cadmium (Cd), %		0 to 0.050

Copper (Cu), %		9.0 to 10.4
Copper (Cu), %		23.5 to 25.7

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0 to 0.030
Lead (Pb), %		0 to 0.030

Nickel (Ni), %		0 to 0.010
Nickel (Ni), %		0.35 to 0.65

Phosphorus (P), %		0 to 0.020
Phosphorus (P), %		0

Silver (Ag), %		89.6 to 91
Silver (Ag), %		74 to 76

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		0 to 0.060

Residuals, %		0 to 0.060
Residuals, %		0