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Chromium as an alloying element in alloy steel is used principally to


1. Improve hardenability
2. Improve mechanical properties at low temperature
3. Improve mechanical properties at elevated temperature
4. Improve the corrosion and oxidation resistance

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Correct Answer - Option 4 : Improve the corrosion and oxidation resistance

Explanation:

Chromium is one of the important metal which is used to improve the following characteristics of a material.

  • To increase the abrasion resistance
  • To provide the better hardness
  • To improve the corrosion and the oxidation resistance
  • To improve the temperature resistance
  • With high C resists wear and abrasion

 

Manganese 

  • It is used to improve the hardness and strength of the material.
  • It also acts as a desulfurizing agent.

Vanadium 

  • It is used to refine grain size.
  • Steels containing vanadium have a much finer grain structure than steels of similar compositions without vanadium.
  • Vanadium is used to improve the mechanical properties of the materials such as hardness and toughness.

Cobalt

  • It improves strength at high temperatures and magnetic permeability.
  • It contributes to red hardness by hardening ferrite.
  • It is an alloying element in certain high-speed steels.
  • Cobalt is used in martensitic steels, where it increases hardness and tempering resistance, especially at higher temperatures.

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