Kovar Bar and Rod

Rupal Metals is a reputable manufacturer and supplier of Delhi, India, which deals in high-grade Kovar Bar and Rod products for essential industrial use. With a high priority on quality and precision, Rupal Metals supplies Kovar alloys characterized by their controlled thermal expansion and superior bonding with ceramics and glass. With years of experience and customer-focused business, the company promises timely delivery and personalized solutions to address varied engineering requirements. Rupal Metals serves industries such as electronics, aerospace, and instrumentation, establishing them as a go-to supplier for high-performance Kovar Bar and Rod components.

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Kovar Round Bars

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What is Kovar Bar and Rod?

Kovar Bar and Rod consists mainly of iron (Fe) with about 29% nickel (Ni) and 17% cobalt (Co), and is therefore suitable for glass-to-metal sealing because it has a balanced thermal expansion characteristic. It has a controlled coefficient of thermal expansion (4.7 x 10⁻⁶/°C over 20°C to 200°C), tensile strength of 450–620 MPa, and density of 8.36 g/cm³. The alloy provides good dimensional stability, average machinability, and consistent magnetic properties, which provide suitable applications in precision engineering under changing thermal conditions.

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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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Why Rupal Metals?

Packaging

Modern Equipments

Expert Engineers

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Efficient Factories

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

Kovar Bar and Rod finds extensive application in hermetic sealing industries, particularly in electronic devices such as vacuum tubes, transistors, and microwave tubes. It is specifically used in hybrid microcircuits and semiconductors where metal-to-glass or metal-to-ceramic sealing is critical. Its minimal thermal expansion, however, qualifies it for use in aerospace sensors, medical imagers, and instrumentation packages. Kovar is also utilized in telecommunications, defense systems, and nuclear instrumentation, where material stability over temperature fluctuations is critical to long-term performance and reliability.

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