Iron is an ancient metal, which can be said to be the first of all kinds of metal materials in terms of production and application scale. No wonder it is called "the king of metal". Some people think that the glory of steel has passed. This is not the case, because the mysterious nature of iron provides a broad application prospect. Let's understand the production technology and charm of steel from the perspective of iron production and technology.
China is one of the first countries in the world to understand magnetic phenomena. As early as the 4th century BC, Guanzi recorded that "there is a benevolent stone on the top and copper and gold on the bottom", which is the earliest written record of magnetic phenomena in China. In ancient books before the Eastern Han Dynasty, "magnetism" has always been written as "kindness". By the 3rd century BC, there was a record of Zhao Shi Tie in Lv Chunqiu. This shows that the ancient working people in China knew long ago to use magnetite to find iron ore.