Kovar Bar and Rod

Welcome to Maduka Metals, your trusted partner for precision materials right here in Abuja. We specialize in supplying high-quality Kovar bar and rod, a unique alloy engineered for reliability in the most demanding applications. Our commitment is to provide local industries with readily accessible materials that meet rigorous international standards, ensuring your projects benefit from both superior quality and the convenience of a dependable Nigerian supplier.

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Kovar Round Bars

Kovar Rectangular Bars

Kovar Square Rods

What is Kovar Bar and Rod?

Kovar is a nickel-cobalt ferrous alloy precisely formulated to have a thermal expansion rate that closely matches that of hard glass and ceramics. This specialized composition results in a material with excellent dimensional stability under temperature fluctuations. It maintains its strength and integrity, preventing stress fractures when sealed with glass, which is crucial for creating durable, long-lasting components in sensitive environments.

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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

The primary use of Kovar bar and rod is in the electronics and telecommunications industries, where it is essential for creating airtight seals in glass-to-metal components. You will find it in the packages of transistors, integrated circuits, and diodes, protecting sensitive internal parts. It’s also vital in aerospace instrumentation, laser systems, and any application where a reliable bond between metal and glass or ceramic must withstand significant temperature changes without failing.

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