A steel alloy containing 36% nickel is called _____________________, which has a zero co-efficient of expansion?
Correct answer: C. Invar
- A. Austenitic stainless steel
- B. Heat resisting steel
- C. Invar
- D. High speed steel
Explanation
Invar is an iron-nickel alloy containing about 36% nickel, noted for its exceptionally low thermal expansion. The other choices are classes of steels and do not have this near-zero expansion property.
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