Alloy 42 (42Ni-Fe) - UNS K94100 | Low Thermal Expansion Alloys

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About Alloy 42 (42Ni-Fe) - UNS K94100 | Low Thermal Expansion Alloys

Item	Details
Grade	Alloy 42 (42Ni-Fe)
Reference Standards (for reference only)	UNS K94100 DIN 1.3917 (17745)
Available Shapes	Coil, Sheet
Manufacturable Thickness Range (Strip, Sheet)	Please contact us
Manufacturable Width Range (Strip, Sheet)	Please contact us
Length	Strip or Sheet (Length less than 2,000 mm)
Technique	Cold Rolled
Temper	Annealed, Skin passed, As Rolled (Hard)
Coil I.D.	300, 400, 566 mm
Chemical Composition	42Ni-Fe
Density	8.11 g/cm³
Thermal Expansion	4.0–4.7 × 10^-6/K (20–480°C)
Thermal Conductivity	10.5 W/(m·K)
Minimum Order Quantity	Please contact us
Country of Origin	Japan
Payment Terms	Telegraphic Transfer (T/T)
Delivery Terms	EXW, FOB, CIF, DAP, etc.
Packing	Our Standard Packing for Export
Export Markets	Asia, Middle East, North America, South America, Europe, etc.
Description	Alloy 42 is a nickel-iron alloy containing approximately 42% nickel. It has a low coefficient of thermal expansion, though higher than Alloy 36, and is designed to closely match the thermal expansion of glass, ceramics, and silicon materials. Because of this compatibility, it is widely used in applications such as glass-to-metal sealing, IC lead frames, and electronic packaging components where dimensional stability and thermal matching are critical. Its balance of thermal expansion control and mechanical stability makes it suitable for precision electronic and semiconductor-related applications.