Alloy 42,ASTM F30,UNS k94100,(Fe-42Ni) ,Chinese 4J42
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.
Forms: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube

Description

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.

Application

Glass to metal seals for a wide variety of electronic tubes, hermetic packages, and automotive and industrial lamps.

parameter

Cross reference:

Russia	UAS	UK	Japan	France	Germany
42H	Glass Sealing 42 Uniseal 42	Nilo42	YEF42 NSD	N42	Vacogil42 Nilo42

Typical chemistry:

Co	C	P	S	Mn	Si	Al	Ni	Fe
≤
1.0	0.05	0.020	0.020	0.80	0.30	0.10	41.5-42.5	balance

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:

20-100℃	20-200℃	20-300℃	20-400℃	20-450℃	20-500℃	20-600℃
5.6	4.9	4.8	5.9	6.9	7.8	9.2

Mechanical Property:

code	status	Tensile strength hδb/MPa
R	Annealed	>590
L	Unannealed	<820

Size Range

Sheet	Thickness:0.10mm~3.50mm, width: ≤300mm
Plate	Thickness:3.5mm~40.0mm, width: ≤500mm
Round wire	Thickness:0.10mm~5.0mm
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