Scrap is waste steel that is recycled or damaged in production and living projects; its carbon content is generally less than 2.0%, and sulfur and phosphorus content are not more than 0.05%.
Domestic scrap resources: The rapid growth of China's crude steel output is mainly from 2000, with an annual growth rate of about 20%. As a result, about 50% of China's social steel stock is produced in 2000 and beyond. Due to the limitation of the number of years of elimination, China is in a period of poverty in scrap steel resources, which cannot meet the needs of the rapid development of the steel industry. According to the data, in 2007, the scrap consumption of major domestic steel mills was only 134.36 kg, which was in a decreasing trend. .
Generally speaking, the scrap produced in life is social scrap, which is mainly scrap steel produced by scrap steel equipment and furniture appliances, such as bicycle racks and automobile shells.
The scrap produced in the production is the scrap produced in the steel metallurgy process and the scrap produced during the mechanical manufacturing process. In the iron and steel enterprises, due to the inevitable splashing of steel slag and the cutting and cutting of the billet in the production process, The scrap produced is steel mill self-produced scrap. Among them, the cutting head of the billet has been produced in large quantities in the molding era, and the amount produced by the continuous casting has been greatly reduced.
The scrap produced during the machining process can be used as recycled scrap because of uniform composition and rust-free, but the scale and amount are small.
Because of the different conditions, scrap steel has different shapes, and its performance is basically the same as that of the steel that produces such scrap. However, it is also affected by factors such as aging effectiveness and fatigue, and its performance is reduced. The geographical distribution of steel resources is not balanced. More than 80% of the scrap steel resources in the country are distributed in Beijing, Tianjin, Shanghai, Guangdong, Liaoning, Heilongjiang, Jin, Lu, Hubei, Sichuan and Jiangsu. Provinces and cities with dense populations; other regions have less than 20% natural scrap resources due to poor geographical conditions and small population. Scrap processing is generally mechanically processed, and common machinery is a press machine, a cutting machine, and the like. Scrap steel is mainly used for steelmaking additives in long-flow converters or steel-making main materials in short-flow electric furnaces.
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