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Tohoku Steel Co., Ltd.
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Low thermal expansion alloy

Iron-36%Nickel alloy has an extremely small thermal expansion coefficient at room temperatures. It is an essential material for precision measurement equipments, precision machine parts, etc.
Kovar, thermal expansion coefficient of which is adjusted equivalent to that of ceramics, is used for sealing.


Thermal expansion curve


Description of materials

[Basic composition]

  • Invar (K-EL70) 36Ni-Fe
  • Super invar(K-EL50) 32Ni-5Co-Fe
  • Kovar (K-ET52) 29Ni-17Co-Fe

Characteristics

[Physical properties]

Characteristics

Coefficient of thermal expansion: Upper α20-60℃, lower α20-100℃

[Mechanical properties]

Mechanical properties, hardness

K-EL70, K-EL50 900℃ after heat treatment
K-ET52 1100℃ after heat treatment

Other

[Free-cutting invar / free-cutting kovar]

Refer to TICS invar, kovar.

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