Invar 42 / 1.3917

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Invar 42® is a nickel-iron alloy that contains 41% nickel and exhibits excellent controlled expansion qualities and is used primarily for controlled expansion and magnetic applications. Invar 42® is also highly effective in magnetic applications. It can be hot formed, cold formed or machined. Nilo 42 possesses many of the qualities of the other Invar nickel iron alloys. It is effective in extreme temperatures ranging from -32C to 275C.

Equivalent Materials

This material data has been provided by Hempel Special Metals.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts





23.0 °C

8.15 g/cm³

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Elongation A50

23.0 °C

40 %

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min., Annealed, Descaled

Hardness, Brinell

23.0 °C

130 [-]

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Annealed, Descaled

Tensile strength

23.0 °C

490 MPa

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Annealed, Descaled

Yield strength Rp0.2

23.0 °C

248 MPa

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Annealed, Descaled

Chemical properties





42 %

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Technological properties

Application areas

Invar 42 is used mainly in:

  • Transformer & capacitor bushings
  • Automotive & industrial lamps
  • Electronic tubes
  • Glass-to-metal applications
  • Ceramic-to-metal Applications