Home > Kovar Sheets and Plates
Marsh Nickel Alloys is a trusted name in the steel industry, specializing in the treatment and supply of premium grade nickel-based alloys. Known for its quality and accuracy, the company caters to a wide range of technical needs throughout Canberra, the Australia, and beyond. The Kovar Sheets & Plates stand out in this offering, known for their exceptional thermal expansion and durability.Marsh Nickel Alloys ensures reliable solutions designed to meet the toughest of specifications, making them the preferred partner in engineering and manufacturing.
Marsh Nickel Alloys, based in Canberra, Australia, specializes in manufacturing and supplying high-precision Kovar sheets and plates. This company is well-regarded for its expertise in controlled-expansion alloys, offering Kovar flat products that meet strict dimensional and metallurgical standards, making them ideal for demanding engineering and electronic applications. From the initial stages of material batching and melting to rolling, annealing, and finishing, Marsh Nickel Alloys guarantees that every sheet and plate they deliver adheres to international standards, ensuring a perfect fit for sealing glass or ceramic components without any stress or mismatch. Their reputation in Canberra is built on reliable supply, tight tolerances, and outstanding service for high-integrity 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 |
Kovar (UNS K94610, ASTM F15) is a nickel-iron-cobalt alloy that typically contains around 29% nickel, 17% cobalt, and the rest iron, along with trace amounts of manganese (≤0.5%), silicon (≤0.2%), and carbon (≤0.04%) to ensure purity and performance. Mechanically, Kovar shows moderate to high tensile strength (about 500-520 MPa in annealed sheet/plate form), a yield strength of around 340-350 MPa, elongation of approximately 30-45%, and a hardness level (soft/annealed) that is suitable for forming (around Rockwell B 60-70). Its coefficient of thermal expansion (CTE) closely aligns with that of borosilicate glass and alumina ceramics, roughly 5 x 10^-6/°C between 20-200°C, gradually increasing at higher temperatures.
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Kovar sheets and plates from Marsh Nickel Alloys are essential in applications where matching thermal expansion between metal and glass or ceramic is crucial. Common uses include hermetic glass-to-metal seals in electronic components like vacuum tubes, LEDs, and sensors, as well as sealed enclosures, feedthroughs, and interfaces in high-tech environments.
