Kovar Bar and Rod

Here in the heart of Addis Ababa, Tariku Metals has built a reputation as a trusted partner for industries requiring precision and reliability. We specialize in supplying high-quality Kovar, a unique alloy that stands up to demanding environments. Our focus is on providing manufacturers and engineers with Kovar bar and rod stock that delivers consistent performance, ensuring your projects are built on a foundation of exceptional material integrity and expertise.

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Kovar Round Bars

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Kovar Square Rods

What is Kovar Bar and Rod?

Kovar possesses a specific composition of iron, nickel, and cobalt that gives it a rare and valuable characteristic: its thermal expansion rate closely matches that of certain glasses and ceramics. This means it expands and contracts at nearly the same rate when heated or cooled. This property, combined with its good mechanical strength and ductility, makes it an indispensable material for creating enduring, hermetic seals in critical applications.

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Kovar Bar and Rod Specification

Standards :	UNS K94610 \| Werkstoff Nr 1.3981 \| DIN 17745 \| ASTM F15 \| AMS 7726 \| AFNOR NF A54-301 \| S.E.W 385
Size Range :	0.015″ Thk up to 2″ Thk
Thickness :	Range from .008″ to .0125″
Length :	2m, 2.44m, 3m, or as required
Width :	10-2500mm

Chemical Compositions of Kovar Bar

Weight %	Ni	Fe	Co	C	Mn	Si	Al	Cr	Mg	Zr	Ti	Cu	Mo
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	0.10 max	0.10 max	0.20 max	0.20 max

Kovar Bar Mechanical Properties

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

Kovar Bar Equivalent Grades

ASTM	UNS	Workstoff	AMS	DIN	AFNOR	S.E.W
F15	K94610	1.3981	7726	17745	NF A54-301	385

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Kovar Bar and Rod Types

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Frequently Asked Questions (FAQ)

Are Kovar Rod Susceptible To Galvanic Corrosion?

Kovar rods, primarily composed of iron, cobalt, and nickel, are resistant to galvanic corrosion due to their similar electrochemical properties with most alloys, reducing the risk when paired with compatible materials.

Can Kovar Bar Be Welded?

Yes, Kovar bar can be welded, but it requires special techniques and precautions due to its unique composition and thermal expansion properties. Proper heat control and filler metals are essential.

What Sizes and Finishes Are Available for Kovar Rod?

Kovar rods typically come in diameters ranging from 1/8" to 4" and lengths of up to 12 feet. Finishes include mill, polished, and brushed surfaces for various applications.

Kovar Bar and Rod Uses

This predictable thermal behavior is why Kovar bar and rod are fundamental in electronics and aerospace. They are primarily used to fabricate lead frames and housings for semiconductor packages and power transistors, creating a perfect, stress-free seal between metal and glass or ceramic components. You’ll also find this material essential in vacuum tubes, laser systems, and any application where a durable, stable connection must withstand significant temperature fluctuations without failing.

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