What is the main ingredient in steel?

The main ingredient in steel is iron, which typically makes up about 98–99% of its composition. Steel is created by adding small amounts of carbon (usually less than 2%) to iron, making it stronger and more durable. Depending on its intended use, other elements like chromium, nickel, and manganese can be added to create different types of steel, such as stainless steel or alloy steel. Steel is widely used in construction, automotive manufacturing, and infrastructure due to its strength, versatility, and recyclability.