Kovar Bar and Rod

Dhruv Metals offers Kovar Bars and Rods, a unique iron-nickel-cobalt alloy designed for controlled expansion and thermal stability. Kovar is specifically used in applications requiring metal-to-glass seals, such as electronics and vacuum systems. With precise dimensional tolerances and polished finishes, our Kovar products meet ASTM F15 standards. Dhruv Metals supplies high-quality Kovar bars for advanced electronic, aerospace, and instrumentation applications where tight thermal expansion control is crucial.

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Kovar Round Bars

Kovar Rectangular Bars

Kovar Square Rods

What is Kovar Bar and Rod?

Kovar typically consists of 29% nickel, 17% cobalt, 0.3% manganese, and the balance is iron. The coefficient of thermal expansion is approximately 5.5 µm/m·°C (20 to 400°C). The tensile strength ranges from 520 to 620 MPa; yield strength is around 415 MPa; and elongation is about 20%. Kovar shows excellent stability under thermal cycling and minimal distortion. It is magnetic and can be easily brazed or welded. Its expansion characteristics closely match borosilicate glass, allowing for strong seals.

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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

Kovar Bars and Rods are mainly used for sealing electronic packages, vacuum tubes, cathode ray tubes, and transistor components. Aerospace and defense industries use Kovar for infrared sensors, satellite parts, and instrumentation packages. In telecommunications, it is used in hermetic packaging, oscillators, and laser housings. Its thermal compatibility with glass and ceramics ensures structural integrity in harsh temperature environments. Dhruv Metals provides Kovar rods that meet critical tolerances for advanced electronic systems.

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