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Kunj Sheets and Plates stands out as a top-notch manufacturer and supplier of Kovar Sheets and Plates right in Chennai, India. Kovar, a unique nickel–cobalt ferrous alloy, is expertly designed to have a thermal expansion rate that closely matches borosilicate glass and ceramics. This makes it a perfect choice for applications that require glass-to-metal and ceramic-to-metal seals. We take pride in offering high-quality Kovar sheets and plates that boast excellent dimensional stability, machinability, and performance even under thermal cycling. Our products adhere to strict industry standards and find their place in high-precision electronic and aerospace sectors. At Kunj, we’re committed to delivering consistent quality, competitive pricing, and timely delivery to satisfy our global customers.
Kovar Sheets and Plates typically consist of 29% nickel, 17% cobalt, 53.5% iron, along with trace amounts of other elements. This specific composition gives Kovar its carefully controlled coefficient of thermal expansion, which aligns closely with that of borosilicate glass. The alloy exhibits a tensile strength of about 517 MPa, a yield strength of around 276 MPa, and offers good elongation and machinability. Kovar maintains its mechanical stability and strength across a broad temperature range. Its distinctive expansion properties and compatibility with glass make it crucial for ensuring hermetic seals in vital electronic and instrumentation components.
| Standard Specification : | UNS K94610 | Werkstoff Nr 1.3981 | DIN 17745 | ASTM F15 | AMS 7726 | AFNOR NF A54-301 | S.E.W 385 |
| Dimensions : | ASTM, ASME, and API |
| Sheets Thickness : | Range from .008″ to .0125″ |
| Plates Thickness : | Ranges from .0125″ to 5.00″ |
| Sheets/Plates Width : | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Sheets/Plates Length : | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Tempers : | Annealed, 1/4, 1/2 Hard, 3/4 Hard, Full Hard |
| Hardness : | Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc. |
| Value Added Service : | Cladding, Heat Treatment, Annealed, Pickling, Polish, Rolling, Cutting, Bending, Forging, Minor Fabrication Etc. |
| Chemical Analysis | |
| Cr | 20 nom |
| Ni | 35 nom |
| Mo | 10 nom |
| Co | 35 nom |
| Material | Condition | Yield Strength (0.1% Offset) | Tensile Strength | Elongation % | ||
|---|---|---|---|---|---|---|
| psi | MPa | psi | MPa | |||
| Alloy K Kovar | Annealed | 49,000 | 340 | 75,000 | 520 | 42 |
| ASTM | UNS | Workstoff | AMS | DIN | AFNOR | S.E.W |
| F15 | K94610 | 1.3981 | 7726 | 17745 | NF A54-301 | 385 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Kovar Sheets and Plates provide excellent thermal expansion properties, making them ideal for applications requiring good compatibility with materials such as glass and ceramics Due to low coefficient of thermal expansion they maintain stability under temperature changes. Kovar also has good mechanical strength, corrosion resistance and strong weldability, making it suitable for harsh environments. Its magnetic properties are stable, making it useful in electronics and aerospace applications, especially for hermetic sealing of components. These features make Kovar ideal for high-performance precision applications.
Kovar Sheets and Plates are primarily utilized in glass-to-metal seals, making them indispensable in the production of electronic vacuum tubes, transistors, diodes, and optoelectronic components. The aerospace and defense sectors rely on Kovar for hermetic packages, sensor housings, and sealing feedthroughs. In the medical field, it’s used in implantable devices and diagnostic instruments that demand airtight seals. Kovar’s exceptional thermal expansion compatibility with glass and ceramics also makes it a go-to choice for lasers, microwave components, and telecommunications equipment. Its ability to perform reliably under thermal cycling ensures that it meets the rigorous demands of various applications.
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