Which one of the following has the lowest percentage of carbon?

The carbon content of iron and steel has a significant effect on their properties, including hardness, strength, ductility, and workability. Among the options given, wrought iron has the lowest carbon content, generally containing less than 0.08% carbon. Its very low carbon content contributes to its softness, high ductility, and good workability compared with the steel types listed in the question. Wrought iron can therefore be shaped and worked relatively easily. In contrast, the higher carbon content generally found in mild steel, soft steel, and hard steel affects their hardness and other mechanical properties. The term "wrought" is associated with working or shaping the material, reflecting the traditional process of working wrought iron into useful forms. Therefore, among the given options, wrought iron is the correct answer because it contains the lowest percentage of carbon.

• Wrought Iron: Has the lowest carbon content among the given options. Its very low carbon content contributes to its softness, ductility, and good workability.
• Mild Steel: Is a low-carbon steel that generally contains more carbon than wrought iron and is widely used in construction and engineering applications.
• Soft Steel: Refers to relatively low-carbon steel and is generally associated with good ductility and workability.
• Hard Steel: Generally has a higher carbon content than mild or soft steel, contributing to greater hardness and reduced ductility.
• Carbon Effect: In plain carbon steels, increasing carbon content generally increases hardness and strength while reducing ductility and workability.