Introduction
Alloy 42 is a low expansion alloy which is very similar to Invar 36. It has a low expansion up to about 300ºC. Principally used as strip for semiconductor lead frames in integrated circuits and bi-metal strip, the alloy can be also used in ceramic to metal seals with alumina and the glass bulb envelope to metal seals.
A nickel-iron controlled-expansion alloy containing 41% nickel. It has a low and nominally constant coefficient of thermal expansion from room temperature to about 300°C.
whose coefficient of expansion makes it suitable for joining to ceramic chips in miniature electronic circuits.
Alloy 42 widely used for glass-to-metal sealing of components that are enclosed in a glass envelope, such as lamps and electron tubes.
Typical Uses and Applications
Alloy 42 (Nilo 42) is used for semiconductor lead frames in integrated circuits, bi-metal thermostat strip, thermostat rods, for ceramic-to-metal seals with alumina ceramics, and various glass-to-metal seals such as the core of copper-clad-wire for sealing into glass envelopes of electric bulbs, radio valves, television tubes and fluorescent lights.
Product Details
Chemical composition:
| Grade |
C% |
P% |
S% |
Mn% |
Si% |
Al% |
Co% |
Ni% |
Fe% |
| Alloy 42 |
Max 0.05 |
Max 0.020 |
Max 0.020 |
Max 0.80 |
Max 0.30 |
Max 0.10 |
Max 1.0 |
41.0-42.5 |
Bal. |
Specifications:
| Grade |
UNS |
Werkstoff Nr. |
| Alloy 42 |
K94100 |
1.3917 |
Physical Properties:
| Grade |
Density |
Melting Point |
Electric Resistivity |
| Alloy 42 |
8.12 g/cm3 |
1440°C |
0.61μΩ·m |
Mechanical Properties:
| Grade |
Tensile Strength |
Yield Strength N/mm² |
Elongation (%) |
| N/mm² |
(0.2% Offset) |
| Alloy 42 |
490 |
250 |
43 |
Coefficient of Expansion
| Grade |
Linear Coefficient of Thermal Expansion ,10-6/ºC |
| 20-100ºC |
20-200ºC |
20-300ºC |
20-400ºC |
20-450ºC |
20-500ºC |
20-600ºC |
| Alloy 42 |
5.6 |
4.9 |
4.8 |
5.9 |
6.9 |
7.8 |
9.2 |
Available Specifications:
| Pipe Smls |
Tube
Smls |
Sheet/Plate |
Bar |
Wire |
ASTM B
ASME SB 163 |
B163 |
ASTM F30 |
ASTM B
ASME SB 166, |
ASTM F29 |
Available forms:
Alloy 42 wire, bar, rod, strip, forging, plate, sheet, tube, fastener and other standard forms are available.
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