Kovar Bar and Rod

Rashid Metals, an established manufacturer and provider located in Muscat, OMAN, specializes in custom metal products from a wide range of industries. Being selective and reliable, the company offers a wide spectrum of material especially premium quality Kovar Bars and Rods, which possess a low coefficient of thermal expansion and exceptional strength. With sophisticated technology and strong QC, Rashid Metals ensures consistent performance of the finished products up to international standards. With an outstanding commitment towards perfection, delivery timelines, and aggressive pricing, Rashid Metals has firmly established its value proposition among most aerospace, electronic manufacturing, and other precision engineering houses.

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Kovar Round Bars

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What is Kovar Bar and Rod?

Kovar Bar and Rod is an iron-nickel-cobalt alloy with the following approximate composition: Nickel-29%, Cobalt-17%, Silicon-0.2%, Manganese-0.3%, Carbon-0.02%, balance Iron. It has a very low coefficient of thermal expansion that makes it excellent for applications in which precision under temperature variation is necessary. Its mechanical properties are tensile strength 485 MPa, yield strength 275 MPa, and elongation 25%. It has a density of 8.36 g/cm³, and it has excellent dimensional stability. Kovar is widely used as electronic packaging, sealing to glass or ceramics, and in aerospace for having consistent thermal and mechanical properties.

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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 Rashid Metals?

Packaging

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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

Kovar is a nickel-cobalt alloy having a low coefficient of thermal expansion; it is widely used for manufacturing Kovar bars and rods requiring a tight thermal expansion match with materials like glass or ceramics. It finds much application in the manufacture of electronic components, such as semiconductor packages and glass-to-metal seals, where its excellent sealing properties are highly advantageous. Kovar bars and rods are also used in aerospace and defense industries for parts that have to withstand extreme thermal stresses. Besides, they are used in precision instruments, medical devices, and vacuum tubes where high thermal stability is crucial.

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