sentence: Mild steel is steel with a low percentage of carbon.
sentences_before: Steel is the most common form of iron. Steels come in several forms.
sentences_after: It is soft and easily bent, but it does not crack easily. It is used for nails and wires. Carbon steel is harder but more brittle. It is used in tools. There are many other types of steel.
concept_name: mild steel
headings: Iron Uses As a metal