FERRY

Description

FERRY® alloy (W. Nr. 2.0842)

FERRY ® alloy : range electrical resistivity and a very low temperature coefficient of resistance (TCR). The low TCR makes the alloy useful for wire-wound precision resistors having operating temperatures up to 750°F (400°C). A reproducible electromotive force against copper makes the alloy suitable for thermocouples and thermocouple compensating leads.

 

Physical Constants & Thermal Properties

Table 2 – Physical Constants & Thermal Properties Density, lb/in³   0.321

g/cm³…………………………………………………………. 8.89

Melting Range, °F………………………………………….. 2230-2320

°C………………………………………….. 1220-1270

Specific Heat, Btu/lb•°F…………………………………………. 0.094

J/kg•°K……………………………………………… 394

Temp. Coefficient of Resistance,

68-212°F, 10^-6 ohm/ohm•°F…………………… 17

20-100°C, µohm/ohm•°C………………………. 30

Coefficient of Expansion, 68-212°F, 10^-6 in/in•°F…………. 8.17

20-100°C, µm/m•°C……………. 14.7

Thermal Conductivity, Btu•in/ft²•h•°F…………………………. 155

W/m•°C………………………………….. 22.4

Electrical Resistivity, ohm•circ mil/ft…………………………… 295

µohm•m…………………………………. 0.490

 

Copper……………………………………………………… 55.0 nominal

Iron………………………………………………………………… 1.0 max.

Carbon……………………………………………………………. 0.1 max.

Manganese……………………………………………………… 1.0 max.

Silicon…………………………………………………………….. 0.5 max.

Nickel…………………………………………………………….. Balance*

 

*Reference to the ‘balance’ of a composition does not guarantee this is exclusively of the element mentioned but that it predominates and others are present only in minimal quantities.

 

Typical Mechanical Properties

Table 3 – Typical Mechanical Properties of Annealed FERRY alloy

Tensile Strength, ksi………………………………………………….. 60

MPa………………………………………………. 415

Yield Strength (0.5% Offset), ksi………………………………….. 21

MPa……………………………… 145

Elongation, %……………………………………………………………. 32