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Kovar Plate Suppliers, Stockist In India

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Kovar plate is a vacuum melted. It contains components like nickel, iron and cobalt. These alloy is the low expansion alloy. The chemical composition of the alloy is managed within narrow limits to ensure the precise, uniform thermal expansion property of the alloy. Usually, Kovar alloy finds application in glass-to-metal seals in scientific apparatus and conductors entering glass envelopes of electronic parts such as vacuum tubes (valves), X-ray and microwave tubes, and lightbulbs. Thus, Kovar alloy is designed to meet the need for a reliable glass-to-metal seal required in electronic devices like vacuum tubes, cathode ray tubes, vacuum systems, and other scientific research. The metals cannot seal to glass because their coefficient of thermal expansion is not the same as the glass. So, the joint cools after fabrication stresses due to the different expansion rates of the glass and metal. This alloy has a thermal as well as a nonlinear thermal expansion curve. So, it can frequently match a glass. Also, those allowing joints are tolerating a wide-ranging temperature. The alloy via glass intermediate forms an oxide layer of the element like nickel and cobalt oxide. The proportion percent of iron oxide is very low because of its reduction with cobalt components. It has the advantage that the strength of these bond components is mostly dependent on the oxide layer width and character. Because the oxide layer melts in the presence of cobalt, and it dissolves in the molten glass.

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KOVAR ALLOY has become super-alloy because of its thermal expansion rate property. When we compare other alloys with Kovar, it expands at a variable rate with increasing temperature and changes in small dimensions. Because of these, KOVAR become a great fit for seals and glass-to-metal bonded assemblies with minimal locked-in pressure. Normally these alloy is used in applications requiring a hermetic seal between the metal alloy and the glass component. These metal to glass seal is produced by performing an oxidizing treatment to the parts after being annealed. The oxide layer is bonded with both the glass and the alloy substrate on which it is formed.


These Kovar alloy is used for making hermetic seals with the harder Pyrex glasses. Also, it is used in power tubes.

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One of the top most Suppliers and stockists of Kovar Plate, wholesaler of Kovar Alloy ASTM F15 Plate in Mumbai, Dealers of Alloy K / Nilo K Plate, Stockholder of Alloy F15 Plate, Kovar Plate in a variety of thickness, width, or diameter, length, straightness and dimension

Kovar Plate Specification

Standards : ASTM F15, AMS/MIL-I-23011
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

Kovar Plate Equivalent Grades

ASTM UNS Workstoff AMS
F15 K94610 1.3981 I-23011 CL1

Kovar Plate Types

Cold Rolled Plate

Kovar Plate

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Kovar Cold Rolled Plate

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Kovar Hot Rolled Plate

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Kovar Plate Thickness

Kovar Alloy Plate Stock Sizes Cut To Your Specifications Maximum 15″ x 72″ Width x Length (thickness in inches)
0.1875″ 0.5000″
0.2500″ 0.6250″
0.2810″ 0.7500″
0.3125″ 1.0000″
0.3750″ 1.2500″
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Kovar Alloy Plate Sizes

Sizes Availability Sizes Availability
0.4mm 5mm
0.5mm 6mm
0.8mm 8mm
1mm 10mm
1.2mm 12mm
1.6mm 16mm
2mm 20mm
3mm 25mm

Chemical Composition of Kovar Plate

Weight % Ni Fe Co C Mn Si Al Cr Mg Zr Ti Cu Mo
Alloy K
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

Mechanical Composition of Kovar Plate

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

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