Which material is ductile, malleable, prone to rusting and used to make car bodies, girders, gates?

• A. Mild Steel (Low carbon steel)
• B. Iron
• C. Stainless steel
• D. High carbon steel

Answer: (A)

Ductile and malleable describe a metal’s ability to deform without breaking, which is essential for forming car body panels, girders, and gates. Low-carbon steel, known as mild steel, has just enough carbon to be strong yet remains very easy to bend, shape, and weld. That combination makes it ideal for large, formable parts like car bodies and structural components. It does rust when exposed to moisture because it’s essentially iron with a small amount of carbon and no corrosion-resistant alloying elements. Stainless steel resists rust, but it’s harder to form and more expensive, so it isn’t the typical choice for everyday car panels and basic gates. High-carbon steel is strong but much less ductile, so it’s not as good for shaping into complex forms. Pure iron would rust readily and isn’t as workable as steel for these applications. So the material that is ductile, malleable, prone to rusting, and used for car bodies, girders, and gates is mild steel.