Which one of the following metal is <strong>NOT</strong> an essential component in stainless steel?

  1. A. Iron
  2. B. Nickel
  3. C. Chromium
  4. D. Tin

Correct Answer: D. Tin

Explanation

Stainless steel is primarily an alloy of iron, chromium, and nickel (along with carbon). Tin is not an essential component.

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