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Chromium in steel:
1. Improves wear resistance, cutting ability and toughness
2. Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
3. Improves cutting ability and reduces hardenability
4. Gives ductility, toughness, tensile strength and anticorrosion properties

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Correct Answer - Option 4 : Gives ductility, toughness, tensile strength and anticorrosion properties

Explanation:

  • Chromium is the most important alloying element and it gives stainless steels their basic corrosion resistance.
  • All stainless steels have a Cr content of at least 10.5% and the higher chromium content increases the corrosion resistance.
  • Chromium also increases the resistance to oxidation at high temperatures and promotes a ferritic microstructure.
  • The metal also improves hardenability, strength, response to heat treatment and wear resistance.

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