Topic: Material Science
Element which makes steel stainless
- A. Mg
- B. Ni
- C. C
- D. Cr
Answer: D. Cr
Explanation: Chromium (Cr) is the key alloying element that makes steel 'stainless' by forming a passive, corrosion-resistant chromium oxide layer on the surface. A minimum of 10.5% Cr is required.