42 Alloy, a low expansion alloy, is very similar to Invar 36 with a slightly different Coefficient of Thermal Expansion. This nickel-iron alloy is ideal forlid, lead frames, stencil/etching, telecommunications and aircraft industry, offering a more affordable alternative to Kovar when a tight seal is not required. 42 Alloy has a virtually constant low rate of thermal expansion at temperatures up to approximately 650°F (343°C). Easily machined and formed hot or cold, 42 Alloy is also used extensively in the medical, electronics and automotive industries.
Glass to metal seals for a wide variety of electronic tubes, hermetic packages, and automotive and industrial lamps.
|42H||Glass Sealing 42 Uniseal 42||Nilo42||YEF42 NSD||N42||Vacogil42 Nilo42|
Notes: Under condition that the average coefficient of the linear expansion meets the requirements of the standard, the content of chromium is allowed to deviate from the stated range.
Average Coefficient of Linear Expansion:
|Heat Treatment of the Samples||Mean Coefficient of Linear Expansion|
|20 to 300℃||20 to 450℃|
|To be heat treated at a temperature of 900±20 the hydrogen, hold for 1h, cool at a rate less than 5℃/min to 200℃||4.0-5.0||6.5-6.7|
Typical Coefficient of linear expansion:
|code||status||Tensile strength hδb/MPa|
|Sheet||Thickness:0.10mm~3.50mm, width: ≤300mm|
|Plate||Thickness:3.5mm~40.0mm, width: ≤500mm|
|Flat Wire||Dia 0.5mm~Dia 5.0mm, length≤1000|
|Rod||Dia 5.0mm~Dia 8.0mm, length≤2000|
|Dia 8.0mm~Dia 32.0mm, length≤2500|
|Dia 32.0mm~Dia180.0mm, length≤1000|
|Capillary||OD 8.0mm~1.0mm,ID 0.1~8.0 length≤2500|
|Pipe||OD 120mm~8.0mm,ID 8.0~129 length≤4000|
Condition: (With max tolerance) cold rolled, cold drawn, hot rolled , hot forging ,peeled turned ,bright ,bright annealed