Experienced supplier of 1.3981,UNS K94610,Alloy K

Alloy K(Nilo K) Sheet/Pipe/Bar

Parameter

Kovar (Alloy K) is a nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Kovar (Alloy K) is used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Kovar (Alloy K) is used for high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames, and photography flash bulbs.

Kovar(Alloy K):UNS K94610,1.3981

Technical Data Sheet

Kovar Chemical Composition (Basic Density 8.36)

Weight %

Alloy K
Kovar

29.0

53.0

17.0

0.04 max

0.50 max

0.20

0.10 max

0.20 max

0.10 max

0.20 max

Typical Mechanical Properties

Material	Condition	Yield Strength (0.1% Offset)		Tensile Strength		Elongation %
		psi	MPa	psi	MPa
Alloy K Kovar	Annealed	49,000	340	75,000	520	42

Availability
Alloy K / Kovar is available in Bar, Rod, Tube, Sheet, Strip, Coil, Plate and Wire. For all stock availability contact Sales for further availability.

Model	GB		ASTM	DIN	BS	AFNOR
Model	New grades	Old grades	ASTM	DIN	BS	AFNOR
4J36（Invar 36)			UNS K93600	W.Nr.1.3912	X1NiCrMoCu	Fe-Ni36
Kovar(Alloy K)			UNS K94610	1.3981
Alloy 42			UNS K94100	1.3917

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