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Why is silicon bronze classified as a bronze alloy despite having no tin?

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Why is silicon bronze classified as a bronze alloy despite having no tin?

(a) Due to strength

(b) Due to its color

(c) Due to ductility

(d) Good machinability

I had been asked this question in semester exam.

I'd like to ask this question from Copper and its Alloys topic in section Non Ferrous Materials of Engineering Material & Metallurgy

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Right option is (b) Due to its color

To explain: Silicon bronze contains 95% copper, 3% silicon, 1% manganese, and 1% iron. Although it does not contain tin, it is still classified as a bronze alloy due to its color. Silicon is added to increase strength and improve corrosion resistance.

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