Kovar® alloys

Kovar alloy

Kovar® alloy is an iron-nickel-cobalt alloy. Kovar® has been used to make hermetic seals with ceramic and glass materials. Kovar® has been used in power tubes, microwave tubes, diodes,s, and transistors. We are the only Kovar alloy supplier in India.

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Product Description

We are a Kovar alloy supplier in India.

Kovar (Nilo®, Alloy K) / 1.3981 / UNS K94610

We are the only Kovar alloy supplier in India.NILO alloy K (UNS K94610/W. Nr. 1.3981), a nickel-iron-cobalt alloy containing approximately 29% nickel and 17% cobalt. Its thermal expansion characteristics match those of borosilicate glasses and alumina-type ceramics. It is manufactured to a close chemistry range, yielding repeatable properties that make it eminently suitable for glass-to-metal seals in mass production applications, or where reliability is paramount. We also stock a wide range of nickel alloys and Hastelloy products. Our inventory includes Hastelloy round bars in almost all sizes, ensuring we can meet your needs with products readily available for immediate delivery.

Available Forms for Kovar® alloys

  • Wire
  • Bar
  • Sheet
  • Plate
  • Tube
  • Forgings
  • Welding Rod

Kovar Alloy Properties and Appearance.

Kovar Alloys Chemical Comparison

Element Content
Carbon (Maximum) 0.02%
Silicon 0.20 %
Cobalt 17.00 %
Manganese 0.30 %
Nickel 29.00 %
Iron Balance

Kovar alloys Physical Properties

Properties Imperial
Density 0.3020 lb/in³

Kovar alloys Electrical Properties

Properties Imperial
Electrical Resistivity 70.0 °F 294.0 ohm- CIR -mil/ft

Kovar  alloys Thermal Properties

Properties Imperial
Curie Temperature 815°F
Thermal Conductivity 120.0 BTU-in/hr/ft2/°F
Melting Range 2,642 °F

Kovar alloy is magnetic at all temperatures below the Curie point. Magnetic properties depend upon heat treatment; the lower the hardness, the higher the permeability values and the lower the hysteresis loss. Kovar alloy is manufactured to meet the requirements of ASTM Specification F-15.

Kovar alloys Specifications

  • UNS K94610
  • Werkstoff Nr 1.3981
  • DIN 17745
  • ASTM F 15
  • AMS 7726 Wire
  • AMS 7727 Bars and Forgings
  • AMS 7728 Sheet, Strip, and Plate
  • MIL-I-23011 class 1
  • AFNOR NF A54-301
  • S.E.W 385
  • DILVER P
  • 4J29

Kovar alloys Applications

Kovar alloy products for a wide range of industries where dimensional changes due to temperature variation must be minimized, some of the applications where UNS K94610 is utilized include:

  • Hermetic seals
  • Power tubes
  • Microwave tubes
  • Diodes
  • Transistors
  • X-ray tubes

Search by Key Words: Alloy K, KOVAR, Kovar Alloy, UNS K94610; ASTM F15, ASTM F-15, 29-17 alloy,


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