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KOVAR/UNS K94610

Kovar/UNS K94610

Grade: Kovar/UNS K94610

Sheet/Plate: 0.3mm-150mm

Strip/Foil: 0.02mm-16mm

Pipe: 6mm*0.5mm-1200mm*100mm

Bar: Ф6mm – Ф600mm

Wire: Ф0.01mm – Ф6mm

Others: Forged Rings, Flanges, Elbows, Tees, Reducers etc.

Standard: ASTM/ASME/AMS

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Kovar is an iron nickel cobalt alloy developed for reliable glass to metal and ceramic to metal seals. Its controlled thermal expansion is compatible with borosilicate glass and alumina ceramics, helping limit thermal stress in hermetic assemblies. Vacuum melting and closely controlled chemistry support consistent processing. The alloy can be formed and machined, with sealing performance strongly influenced by surface preparation and heat treatment.

Chemical composition

Element Weight percent
Ni 29.00 nominal
Co 17.00 nominal
Fe Balance
C 0.02 max
Mn 0.30 nominal
Si 0.20 nominal

Carpenter type analysis; nominal unless marked maximum. [1]

Product specifications

Product form Specification route Qualification
Sheet strip plate SAE AMS 7728 Manufacturer referenced; confirm revision
Rod bar forgings SAE AMS 7727 Manufacturer referenced; confirm revision
Wire SAE AMS 7726 Manufacturer referenced; confirm revision
Sheet strip rod bar tube wire ASTM F15 Withdrawn 2024; legacy contractual use only
Tubing ASTM F15 plus purchaser drawing Legacy specification; dimensions and tests by agreement

Kovar is a Carpenter trademark; NILO K is the corresponding Special Metals controlled expansion grade. Product certification governs interchangeability. [1–3, 10]

Mechanical properties

Property Value Unit
Tensile strength 520 MPa
Yield strength at 0.2 percent offset 340 MPa
Elongation over 50 mm 42 %
Reduction of area 72 %

Typical NILO K values at 20°C; annealed reference data, not acceptance limits. [2, 3]

Application areas

  • Hermetic semiconductor packages and transistor headers
  • Glass and ceramic seals in electronic components
  • Power tubes and microwave tubes

Kovar is an iron nickel cobalt alloy developed for reliable glass to metal and ceramic to metal seals. Its controlled thermal expansion is compatible with borosilicate glass and alumina ceramics, helping limit thermal stress in hermetic assemblies. Vacuum melting and closely controlled chemistry support consistent processing. The alloy can be formed and machined, with sealing performance strongly influenced by surface preparation and heat treatment.

Chemical composition

Element Weight percent
Ni 29.00 nominal
Co 17.00 nominal
Fe Balance
C 0.02 max
Mn 0.30 nominal
Si 0.20 nominal

Carpenter type analysis; nominal unless marked maximum. [1]

Product specifications

Product form Specification route Qualification
Sheet strip plate SAE AMS 7728 Manufacturer referenced; confirm revision
Rod bar forgings SAE AMS 7727 Manufacturer referenced; confirm revision
Wire SAE AMS 7726 Manufacturer referenced; confirm revision
Sheet strip rod bar tube wire ASTM F15 Withdrawn 2024; legacy contractual use only
Tubing ASTM F15 plus purchaser drawing Legacy specification; dimensions and tests by agreement

Kovar is a Carpenter trademark; NILO K is the corresponding Special Metals controlled expansion grade. Product certification governs interchangeability. [1–3, 10]

Mechanical properties

Property Value Unit
Tensile strength 520 MPa
Yield strength at 0.2 percent offset 340 MPa
Elongation over 50 mm 42 %
Reduction of area 72 %

Typical NILO K values at 20°C; annealed reference data, not acceptance limits. [2, 3]

Application areas

  • Hermetic semiconductor packages and transistor headers
  • Glass and ceramic seals in electronic components
  • Power tubes and microwave tubes

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