Multiple choice

Which of the following elements is added to steel to produce stainless steel?

  1. Zinc

  2. Aluminium

  3. Chromium

  4. Tin

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Stainless steel requires at least 10.5% chromium, which forms a protective oxide layer on the surface that prevents rust and corrosion. This chromium oxide layer is self-repairing when scratched in the presence of oxygen.