Question

The major constituent of phosphor bronze is
1. Zinc
2. Copper
3. Lead
4. Aluminium

Answer 1

Correct Answer - Option 2 : Copper

Phosphorous bronze

• Phosphorous bronze contains 90% copper, 9.7% tin and 0.3% phosphorus.
• The box nut or replaceable nut of a bench vice is made up of phosphorous bronze.

Gunmetal

• Gunmetal is typically composed of 86% copper, 9.5% tin, 2.5% lead, and 2% zinc.
• It was used mainly for making guns and bullets. Now it is superseded by Steel.
• Gunmetal is used extensively for making heavy machinery parts as it can withstand high pressure and is corrosion resistant.