Hemi Metals, located in Hamilton, New Zealand, is a reputable manufacturer and supplier of top-notch Kovar Bar and Rod. Known for its precision engineering and dependable supply chain, Hemi Metals caters to a variety of industries that need materials with outstanding thermal and mechanical stability. Kovar, a nickel-cobalt ferrous alloy, is specifically designed to align with the thermal expansion of borosilicate glass and ceramics, making it perfect for hermetic sealing applications. With a strong focus on quality and performance, Hemi Metals guarantees that every Kovar Bar and Rod adheres to strict industry standards, offering customers durable, consistent, and high-performance metal solutions.
Kovar Bar and Rod primarily consists of 29% nickel, 17% cobalt, and the rest iron, resulting in an alloy with unique thermal expansion characteristics that work well with glass and ceramics. On the mechanical side, Kovar shows moderate tensile strength, good ductility, and excellent fatigue resistance. It maintains its shape over a wide temperature range, with a thermal expansion coefficient that closely matches that of borosilicate glass. Kovar also boasts good corrosion resistance and can be easily machined, welded, or heat-treated for specialized uses, making it incredibly versatile for precision engineering tasks.
| 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 |
| 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 |
| 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 |
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.
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.
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 finds its applications in electronics, aerospace, and vacuum technologies where precise dimensional stability is crucial. It’s often used for hermetic seals in glass-to-metal and ceramic-to-metal assemblies, electronic packaging, and feedthroughs. Its compatibility with glass in terms of thermal expansion makes it ideal for light bulb and semiconductor housings, sensor components, and vacuum tubes. Furthermore, Kovar is utilized in aerospace applications that demand reliable performance under extreme temperature changes. Its machinability and strength also render it suitable for precision mechanical components, connectors, and instrumentation where high reliability and dimensional accuracy are key.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Hemi Metals is a leading manufacturer, supplier, and exporter of high-quality bars, rods, and forgings, catering to various industries in Hamilton New Zealand
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