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Which of the following alloys contain(s) nickel?
1. Inconel
2. Invar
3. German silver
4. All of the options

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Correct Answer - Option 4 : All of the options

Explanation:

Nickel alloys are more costly than steel and aluminum but are less costly than refractory metals (W, Mo, Ti, etc.) for solving severe temperature  Strength problems. Also, they display magnetic, electricthermal properties for particular applications.

Nickel alloys which are particularly useful for general industrial purposes are as below:

  • Monel Metal.
  • K-Monel.
  • German silver.
  • Invar.
  • Nichrome.
  • Inconel.
  • Nimonics.

Inconel:

Inconel contains 79.5% Ni, 0.2% Cu, 13% Cr, 6.5% iron, and a small amount of silicon and manganese. 

It has corrosion-resistant properties of Monel metal but has better resistance to sulphur at higher temperatures.

It retains its strength at extremely high temperatures and can be used at 1150°c.

It creep properties are very good.

It is non-magnetic at all temperatures above -22°c.

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