Which metal is described as containing a low carbon content?

• A. Cast iron
• B. Stainless steel
• C. Mild steel
• D. Copper

Answer: (C)

Low carbon content in metals is a key factor that determines how easily the metal can be formed, welded, and bent. Among common metals, one is known specifically for its low carbon content: mild steel. It typically contains about 0.05% to 0.25% carbon, which makes it very ductile and weldable while still offering reasonable strength. That combination is why mild steel is described as low-carbon steel and is widely used for structural shapes, panels, and fabricated parts.

High-carbon materials, like cast iron, have much more carbon (around 2% to 4%), which makes them hard and strong but also brittle. Stainless steel is an alloy with chromium and other elements for corrosion resistance; its carbon content varies and isn’t defined by “low carbon” alone. Copper is non-ferrous and not a steel, so carbon content isn’t used to describe it in the same way.

So the metal described as containing a low carbon content is mild steel.