Steel is an iron-carbon alloy with a carbon content of 0.02%-2. 1 1%. We usually call it steel together with iron. In order to ensure its toughness and plasticity, the carbon content generally does not exceed 1.7%.
The application and research of steel has a long history, but before the invention of bainite steelmaking in the19th century, the production of steel was a high-cost and inefficient work. Nowadays, steel has become one of the most used materials in the world because of its low price and reliable performance, and it is an indispensable part of architecture, manufacturing and people's daily life. It can be said that steel is the material basis of modern society.