Steel contains carbon existing entirely in the__________________?
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Answer: A. Combined form
Explanation
In carbon steel carbon exists entirely in a combined chemical form as iron carbide. Carbon atoms dissolve in the iron matrix or precipitate as cementite rather than existing as free graphite. Chemical bonding between iron and carbon prevents free uncombined graphite flakes in steel. Steel is an iron-carbon alloy where microstructures depend on thermal processing and carbon content. Cementite or iron carbide is a hard brittle compound containing sixty-six point seven percent iron. Cast irons contain free graphite whereas steels contain carbon strictly in combined states.
Structural steel frameworks rely on combined carbon for high tensile strength and ductility. Heat treatment alters the combined carbon distribution to achieve desired hardness in tools. Metallurgists examine steel microstructures under microscopes to verify combined carbon phases. Free graphite is characteristic of gray cast iron rather than structural carbon steel alloys. Stating both A and B are true is incorrect because steel never contains free graphite. Stating neither A nor B is true ignores the fact that carbon exists entirely in combined form.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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