Which of the following metals is the main constituent of stainless steel's matrix?

Which of the following metals is the main constituent of stainless steel's matrix?

• A. Iron
• B. Chromium
• C. Nickel
• D. Vanadium

Answer: (A)

Stainless steel is an iron-based alloy, with iron forming the matrix—the continuous base phase that makes up the bulk of the material and sets its fundamental structure. The other elements, such as chromium, nickel, and vanadium, are added in smaller amounts to enhance properties like corrosion resistance, toughness, and strength, but they sit within the iron framework rather than replacing it. Chromium creates the protective passive layer that gives stainless steel its corrosion resistance, while nickel and others adjust the microstructure and mechanical behavior. Since iron is the predominant element by mass, it is the main constituent of the stainless steel matrix.

Stainless steel is an iron-based alloy, with iron forming the matrix—the continuous base phase that makes up the bulk of the material and sets its fundamental structure. The other elements, such as chromium, nickel, and vanadium, are added in smaller amounts to enhance properties like corrosion resistance, toughness, and strength, but they sit within the iron framework rather than replacing it. Chromium creates the protective passive layer that gives stainless steel its corrosion resistance, while nickel and others adjust the microstructure and mechanical behavior. Since iron is the predominant element by mass, it is the main constituent of the stainless steel matrix.