Question

A steel alloys containing 36% of nickel is known as
1. Invar
2. Mild steel
3. Chrome steel
4. Stainless steel

Answer 1

Correct Answer - Option 1 : Invar

Explanation:

Invar:

• Invar is a 36% nickel & 64% steel alloy which has the lowest thermal expansion among all metals and alloys in the range from room temperature up to approximately 230°C.
• The alloy is ductile and easily weldable.
• Recommended for applications requiring no dimensional changes with temperature variations. 
• It is used in the making of clocks and scientific instruments like surveying tapes.
• Invar types are used mainly for linear measurements of a very high degree of Precision such as measurement of baseline.

Name of the alloy	Made up of
Brass	Copper and Zinc
Bronze	Copper and Tin
Stainless steel	Iron, chromium, Nickle, Carbon
German Silver	Copper, Zinc, and Nickle
Nickel Steel	Iron and Nickel