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Steel is an alloy of which two elements?

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in Casting-Forming-Welding I by (687k points)
Steel is an alloy of which two elements?

(a) Iron and Brass

(b) Brass and aluminium

(c) Iron and carbon

(d) Carbon and aluminium

I have been asked this question in an international level competition.

Question is from Pattern Materials in chapter Pattern and Pattern Making of Casting-Forming-Welding I

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Correct choice is (c) Iron and carbon

The explanation is: Steel is an alloy of carbon and iron. Carbon is present in the alloy up to 2% by weight and it takes up interstitial sites of the microstructure of iron. There are three types of alloys classified in this, high alloy steel, low alloy steel and medium alloy steel.

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