Main alloying element in stainless steel is:

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ISRO SAC Technician B Fitter 6 Nov 2016 Official Paper
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  1. chromium
  2. nickel
  3. vanadium
  4. carbon

Answer (Detailed Solution Below)

Option 1 : chromium
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Explanation:

Stainless steel:

  • Stainless steel is an alloy (mixture of two or more metals) consisting of iron, chromium, nickel, carbon, etc.
  • Stainless steel is a metal alloy, made up of steel mixed with elements such as chromium, nickel, silicon, aluminum, and carbon.
  • Iron is mixed with carbon to produce steel which is the main component of stainless steel.
  • Chromium is added to make it resistant to rust.
  • Stainless steels are steels containing at least 10.5% chromium, less than 1.2% carbon, and other alloying elements.
  • The main alloying element in stainless steel is chromium.
  • Stainless steel's corrosion resistance and mechanical properties can be further enhanced by adding other elements, such as nickel, molybdenum, titanium, niobium, manganese, etc.
  • It has high structural strength as well as resistance to corrosion.
  • Stainless steels are not confined to applications requiring resistance to atmosphere corrosion.
  • They are used extensively for chemical plant and food processing equipment where they combine corrosion resistance at elevated temperatures.

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Stainless Steel Grade 1.4016 1.4301 1.4462
Type Ferritic Austenitic Duplex
Molybdenum (%) - - 2.5
Nickel (%) - 8 4.5
Chromium (%) 17 17 21
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