Structural steel is a type of steel that is used to build large structures. It is strong and durable and can withstand many kinds of weather and lots of activity. Structural steel is used to make buildings like skyscrapers, bridges, and large stadiums. Structural steel is made of iron, with a small amount of carbon added. It is then shaped into different shapes and sizes. These shapes and sizes make it easy for builders to use the steel when making a structure.