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Q: With a percentage increase of carbon in steel, decreases its ...........
  • A. strength
  • B. hardness
  • C. brittleness
  • D. ductility
Correct Answer: Option D - Steel is an alloy of carbon and iron metal. In steel carbon percentage up to 1.5% and this carbon occurs in cementile form but not independently. • If carbon is more in steel then it is brittle and hard and ductility less. • In mild steel – 0.15 to 0.30% (carbon) • In medium carbon steel – 0.30 to 0.70 % • In high carbon steel – 0.70 to 1.5%
D. Steel is an alloy of carbon and iron metal. In steel carbon percentage up to 1.5% and this carbon occurs in cementile form but not independently. • If carbon is more in steel then it is brittle and hard and ductility less. • In mild steel – 0.15 to 0.30% (carbon) • In medium carbon steel – 0.30 to 0.70 % • In high carbon steel – 0.70 to 1.5%

Explanations:

Steel is an alloy of carbon and iron metal. In steel carbon percentage up to 1.5% and this carbon occurs in cementile form but not independently. • If carbon is more in steel then it is brittle and hard and ductility less. • In mild steel – 0.15 to 0.30% (carbon) • In medium carbon steel – 0.30 to 0.70 % • In high carbon steel – 0.70 to 1.5%