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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