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Scrap iron refers to the waste iron products and scraps produced during processing, which can be recycled after processing. The word "scrap iron" is a common saying, which generally refers to abandoned or abandoned iron and iron tools, as well as scraps produced during the processing of iron tools. Iron is one of the metal elements and an important raw material for industrial production. The so-called scrap iron can be regenerated as long as it is not completely oxidized, which belongs to the category of ferrous metals. There is no real scrap iron. But in ancient times, cast iron was often discarded until it was completely oxidized. Scrap iron is a derivative of iron. Since there was iron, there has been scrap iron. In ancient times, scrap iron was almost useless, and it was only in modern times that it began to be reused or smelted again. This trend mainly appeared after the British industrial revolution and began to affect the whole world.