Which element is commonly found in stainless steel?

• A. Chromium
• B. Iron
• C. Copper
• D. Zinc

Answer: (A)

Stainless steel gains its name from a protective layer that forms on its surface when chromium is present. This element enables a thin, stable chromium oxide film to form in air, which sticks to the metal and prevents corrosion of the iron base. Once this layer is established, it can repair itself if scratched, keeping the steel “stainless” in many environments. That self-healing oxide layer is the defining feature, and it relies on a sufficient chromium content (about 10.5% or more).

While iron is the main metal in stainless steel, the key distinguishing addition is chromium. Copper and zinc aren’t defining components of stainless steel—zinc is more typical in galvanized steel and copper in other alloys. So chromium is the element most commonly found in stainless steel and responsible for its core property.