ASTM B477 Au-Ni-Ag vs. R30155 Cobalt

ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while R30155 cobalt belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

For each property being compared, the top bar is ASTM B477 Au-Ni-Ag and the bottom bar is R30155 cobalt.

ASTM B477 Gold-Nickel-Silver Electrical Contact Alloy UNS R30155 (formerly Grade 661) Iron-Cobalt Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		95
Elastic (Young's, Tensile) Modulus, GPa		210

Elongation at Break, %		5.5 to 11
Elongation at Break, %		34

Poisson's Ratio		0.41
Poisson's Ratio		0.29

Shear Modulus, GPa		34
Shear Modulus, GPa		81

Shear Strength, MPa		190 to 320
Shear Strength, MPa		570

Tensile Strength: Ultimate (UTS), MPa		310 to 550
Tensile Strength: Ultimate (UTS), MPa		850

Thermal Properties

Latent Heat of Fusion, J/g		80
Latent Heat of Fusion, J/g		300

Melting Completion (Liquidus), °C		1010
Melting Completion (Liquidus), °C		1470

Melting Onset (Solidus), °C		930
Melting Onset (Solidus), °C		1420

Specific Heat Capacity, J/kg-K		160
Specific Heat Capacity, J/kg-K		450

Thermal Expansion, µm/m-K		15
Thermal Expansion, µm/m-K		14

Otherwise Unclassified Properties

Density, g/cm³		17
Density, g/cm³		8.5

Common Calculations

Stiffness to Weight: Axial, points		3.1
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		8.9
Stiffness to Weight: Bending, points		23

Strength to Weight: Axial, points		5.0 to 9.0
Strength to Weight: Axial, points		28

Strength to Weight: Bending, points		6.0 to 8.8
Strength to Weight: Bending, points		24

Thermal Shock Resistance, points		16 to 28
Thermal Shock Resistance, points		21

Alloy Composition

Carbon (C), %		0
Carbon (C), %		0.080 to 0.16

Chromium (Cr), %		0
Chromium (Cr), %		20 to 22.5

Cobalt (Co), %		0
Cobalt (Co), %		18.5 to 21

Gold (Au), %		74.2 to 75.8
Gold (Au), %		0

Iron (Fe), %		0
Iron (Fe), %		24.3 to 36.2

Manganese (Mn), %		0
Manganese (Mn), %		1.0 to 2.0

Molybdenum (Mo), %		0
Molybdenum (Mo), %		2.5 to 3.5

Nickel (Ni), %		2.6 to 3.4
Nickel (Ni), %		19 to 21

Niobium (Nb), %		0
Niobium (Nb), %		0.75 to 1.3

Nitrogen (N), %		0
Nitrogen (N), %		0 to 0.2

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.040

Silicon (Si), %		0
Silicon (Si), %		0 to 1.0

Silver (Ag), %		21.4 to 22.6
Silver (Ag), %		0

Sulfur (S), %		0
Sulfur (S), %		0 to 0.030

Tantalum (Ta), %		0
Tantalum (Ta), %		0.75 to 1.3

Tungsten (W), %		0
Tungsten (W), %		2.0 to 3.0

Residuals, %		0 to 0.3
Residuals, %		0