Nickel-iron Alloy 42, also known as UNS K94100, is a nickel-iron alloy containing 42% nickel and also controlled expansion alloy with a low coefficient of thermal expansion over the range 20-300°C (85-570°F). It is composed of nickel and iron, with small amounts of other elements. Alloy 42 is known for its ability to maintain precise dimensions over a range of temperatures, making it suitable for applications where dimensional stability is crucial. It is commonly used in electronic and electrical components, glass-to-metal seals, telecommunications industry, aerospace and defense applications, and automotive industry, among others, where its unique thermal expansion properties are valued.
Whatsapp:
+8615900526263E-mail:
sales@cocessalloys.comChemical Composition
|
Carbon (C) |
0.15 % max. |
|
Manganese (Mn) |
0.6 % max. |
|
Silicon (Si) |
0.4 % max. |
|
Phosphorus (P) |
0.025 % max. |
|
Sulfur (S) |
0.025 % max. |
|
Chromium (Cr) |
0.50 % max. |
|
Nickel (Ni) |
41-43 % |
|
Cobalt (Co) |
0.5 % max. |
|
Iron (Fe) |
Balance |
Physical Properties
|
Density |
lb/in3 |
0.293 |
|
|
g/cm3 |
8.11 |
|
Melting point |
°F |
2615 |
|
|
°C |
1435 |
|
Inflection Point, |
°F |
700 |
|
|
°C |
370 |
|
Thermal Conductivity at 20°C (68°F) |
|
|
|
|
Btu•in/ft2•h•°F |
72.8 |
|
|
W/m•°C |
10.5 |
|
Electrical Resistivity 20°C (68°F) |
|
|
|
|
ohm•circ mil/ft |
367 |
|
|
microhm-cm |
61 |
|
Expansion coefficent (10ˉ⁶/℃) |
|
|
|
|
from 20°C to 100°C |
5.3 |
|
|
from 20°C to 150°C |
5.3 |
|
|
from 20°C to 200°C |
5.3 |
|
|
from 20°C to 250°C |
5.3 |
|
|
from 20°C to 300°C |
5.3 |
|
|
from 20°C to 350°C |
5.4 |
|
|
from 20°C to 400°C |
6.2 |
|
|
from 20°C to 450°C |
7.1 |
|
|
from 20°C to 550°C |
8 |
Mechanical Properties
|
Form |
Temperature |
Tensile Strength |
Yield Strength |
Elongation on 50 mm (0.2 inch) |
Reduction of Area |
||
|
Mpa |
ksi |
MPa |
ksi |
% |
% |
||
|
Hot-rolled Bar |
Room Temperature |
490 |
71 |
250 |
36 |
43 |
72 |
Nickel-iron Alloy 42 finds applications in various industries due to its low and controlled coefficient of thermal expansion. Some specific applications of Alloy 42 include:
1. Electronic and Electrical Components: Alloy 42 is widely used in electronic and electrical components, such as lead frames, connectors, and integrated circuit lead frames, where dimensional stability over a wide temperature range is crucial.
2. Glass-to-Metal Seals: It is employed in the production of glass-to-metal seals, which are utilized in a variety of electronic and electrical applications, including vacuum tubes, transistors, and other electronic devices.
3. Telecommunications Industry: Alloy 42 finds applications in the telecommunications industry, particularly in components where stability and reliability are important, such as in waveguide tubing and antennas.
4. Aerospace and Defense Applications: It is used in aerospace and defense applications, including in the construction of aircraft and aerospace instrumentation, where precise dimensional stability is essential.
5. Automotive Industry: Alloy 42 is utilized in automotive applications, such as in the production of sensors, where resistance to thermal expansion and contraction is required.
Specifications for Nickel-iron Alloy 42 include the following:
|
Wire |
Sheet and strip |
Sheet, strip, rod, bar, tubing and wire |
|
ASTM F 29 |
ASTM B 753 |
ASTM F 30 |
Standard product forms of Nickel-iron Alloy 42 are pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. The products are available in a wide variety of sizes. Please contact us at sales@cocessalloys.com for full information.
