NILO® Alloy K

1.3981  /  UNS K94610

A nickel-iron-cobalt controlled-expansion alloy containing 29% nickel. Its coefficient of expansion, which decreases with rising temperature to the inflection point, matches the expansion rate of borosilicate glasses and alumina ceramics. Used for glass-to-metal seals in applications requiring high reliability or resistance to thermal shock. Examples are high-power transmitting valves, transistor leads and headers, integrated-circuit lead frames, and photography flash bulbs.

Stock program

Wire

Coil
  • 4.75 mm

Bars

  • 4.75 mm
  • 9.52 mm
  • 12.70 mm
  • 15.88 mm
  • 19.05 mm
  • 25.40 mm
  • 31.75 mm
  • 34.93 mm
  • 38.10 mm
  • 44.45 mm
  • 50.80 mm
  • 57.15 mm
  • 63.50 mm
  • 76.10 mm
  • 88.90 mm
  •  

Sheets / Plates

  • 0.10 mm
  • 0.15 mm
  • 0.20 mm
  • 0.30 mm
  • 0.38 mm
  • 0.50 mm
  • 0.63 mm
  • 0.76 mm
  • 0.90 mm
  • 1.00 mm
  • 1.27 mm
  • 1.50 mm
  • 1.83 mm
  • 2.03 mm
  • 2.30 mm
  • 2.54 mm
  • 3.18 mm
  • 6.35 mm
  • 7.93 mm
  • 9.52 mm
  • 12.70 mm
  • 15.88 mm
  • 19.05 mm
  • 25.40 mm
  • 38.10 mm
  •  

Downloads

Datasheet KOVAR and NILO K (EN)
Limiting
Fe¹   53.00 %
Ni¹   29.00 %
Co¹   17.00 %
Mn max. 0.50 %
Cr max. 0.20 %
Cu max. 0.20 %
Mo max. 0.20 %
Si max. 0.20 %
Al max. 0.10 %
Mg max. 0.10 %
Ti max. 0.10 %
Zr max. 0.10 %
C max. 0.04 %

¹ Nominal value; adjusted to meet expansion requirements.

Density
g/cm³   8.16
lb/in³   0.295
Recommended Welding Products
Electrode Nickel 141
  INCO WELD A
  INCO WELD B
Filler Metal Nickel 61
  INCONEL 82