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Alloys containing 2.0-6.7% carbon are considered as __________

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Alloys containing 2.0-6.7% carbon are considered as __________

(a) Steel

(b) Cast-iron

(c) Aluminum

(d) Brass

The question was posed to me in examination.

This interesting question is from Iron-Carbon System and their Alloys in portion Constitution of Alloys and Phase Diagrams of Engineering Material & Metallurgy

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The correct answer is (b) Cast-iron

To explain: Due to availability, low-cost, and their properties, iron and steel are used in more than 90% of the total usage of metals in the world. Steels are those alloys containing 0.06-2.0% carbon, whereas cast-irons contain 2.0-6.7% carbon.

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