ASTM B780 Alloy vs. ASTM A369 Grade FP9

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while ASTM A369 grade FP9 belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is ASTM B780 alloy and the bottom bar is ASTM A369 grade FP9.

ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy ASTM A369 Grade FP9 Cr-Mo Steel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		83
Elastic (Young's, Tensile) Modulus, GPa		190

Elongation at Break, %		1.1 to 9.1
Elongation at Break, %		20

Poisson's Ratio		0.36
Poisson's Ratio		0.28

Shear Modulus, GPa		30
Shear Modulus, GPa		75

Shear Strength, MPa		200 to 340
Shear Strength, MPa		300

Tensile Strength: Ultimate (UTS), MPa		330 to 590
Tensile Strength: Ultimate (UTS), MPa		470

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		270

Specific Heat Capacity, J/kg-K		270
Specific Heat Capacity, J/kg-K		480

Thermal Expansion, µm/m-K		18
Thermal Expansion, µm/m-K		13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		70 to 76
Electrical Conductivity: Equal Volume, % IACS		9.0

Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68
Electrical Conductivity: Equal Weight (Specific), % IACS		10

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		7.8

Common Calculations

Stiffness to Weight: Axial, points		4.5
Stiffness to Weight: Axial, points		14

Stiffness to Weight: Bending, points		14
Stiffness to Weight: Bending, points		25

Strength to Weight: Axial, points		9.1 to 16
Strength to Weight: Axial, points		17

Strength to Weight: Bending, points		11 to 15
Strength to Weight: Bending, points		17

Thermal Shock Resistance, points		16 to 29
Thermal Shock Resistance, points		13

Alloy Composition

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

Carbon (C), %		0
Carbon (C), %		0 to 0.15

Chromium (Cr), %		0
Chromium (Cr), %		8.0 to 10

Copper (Cu), %		23.5 to 25.7
Copper (Cu), %		0

Iron (Fe), %		0 to 0.050
Iron (Fe), %		87.1 to 90.3

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

Manganese (Mn), %		0
Manganese (Mn), %		0.3 to 0.6

Molybdenum (Mo), %		0
Molybdenum (Mo), %		0.9 to 1.1

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

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.030

Silicon (Si), %		0
Silicon (Si), %		0.5 to 1.0

Silver (Ag), %		74 to 76
Silver (Ag), %		0

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

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