Silicon percentage in iron castings to have maximum hardness should be about__________________?
Correct answer: C. 0.8
- A. 0.3
- B. 0.5
- C. 0.8
- D. 2.5
Explanation
A low silicon content, about 0.8%, favours carbide formation and suppresses graphite, giving cast iron high hardness. Higher silicon promotes graphite and generally produces a softer casting.
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