Question:
Addition of Pb in Brass improves:
Addition of Pb in Brass improves:
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Lead is added to brass not for strength or toughness but to enhance machinability — it makes the alloy easier to machine with cleaner cuts and better surface finish.
Updated On: Jun 20, 2025
- Machinability
- Strength
- Toughness
- Ductility
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The Correct Option is A
Solution and Explanation
Brass is an alloy primarily composed of copper and zinc. To improve its properties for specific applications, small amounts of other elements may be added.
When lead (Pb) is added to brass, it does not go into solid solution but instead forms discrete particles at the grain boundaries. These lead particles act as lubricants during machining, making the material easier to cut and shape.
Hence, lead improves machinability significantly without greatly affecting the strength or ductility of the alloy. It is commonly used in free-cutting or free-machining brass for manufacturing precision components.
When lead (Pb) is added to brass, it does not go into solid solution but instead forms discrete particles at the grain boundaries. These lead particles act as lubricants during machining, making the material easier to cut and shape.
Hence, lead improves machinability significantly without greatly affecting the strength or ductility of the alloy. It is commonly used in free-cutting or free-machining brass for manufacturing precision components.
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