Iron alloys are alloys in which one or more metal or non-metal elements are fused with iron elements. For example, ferrosilicon is Fe2Si, Fe5Si3, FeSi, FeSi2 and other silicides formed by silicon and iron. They are the main components of ferrosilicon. The silicon in ferrosilicon mainly exists in the form of FeSi and FeSi2, especially FeSi is relatively stable. Different components of ferrosilicon have different melting points. For example, 45% ferrosilicon has a melting point of 1260°C and 75% ferrosilicon has a melting point of 1340°C. Ferromanganese is an alloy of manganese and iron, which also contains a small amount of other elements such as carbon, silicon, and phosphorus. Depending on its carbon content, ferromanganese is divided into high-carbon ferromanganese, medium-carbon ferromanganese and low-carbon ferromanganese. Ferromanganese alloys containing sufficient silicon are called silicomanganese alloys.
Ferroalloys are not metal materials that can be used directly, but are mainly used as intermediate raw materials for deoxidizers, reducing agents and alloy additives in steel production and foundry industries.
Classification of ferroalloys:
With the development of modern science and technology, various industries have higher and higher requirements for the variety and performance of steel, and thus higher requirements for ferroalloys. There are many types of ferroalloys, and there are many classification methods. Generally, they are classified according to the following methods:
(1) According to the classification of the main elements in the iron alloy, it can be divided into: silicon, manganese, chromium, vanadium, titanium, tungsten, molybdenum and other series of iron alloys.
(2) According to the carbon content of ferroalloys, it can be divided into: high carbon, medium carbon, low carbon, micro carbon, ultra micro carbon and other varieties.
(3) According to the classification of production methods, it can be divided into: blast furnace ferroalloy, electric furnace ferroalloy, out-of-furnace (metal thermal) ferroalloy, vacuum solid-state reduction ferroalloy, converter ferroalloy, electrolytic ferroalloy, etc. In addition, there are special iron alloys such as oxide compacts and heating iron alloys.
(4) According to the two or more alloy elements contained in the multi-element iron alloy, the main varieties are silicon aluminum alloy, silicon calcium alloy, silicon manganese aluminum alloy, silicon calcium aluminum alloy, silicon calcium barium alloy, silicon aluminum barium calcium alloy Wait.
Among the three ferroalloy series of silicon, manganese, and chromium, ferrosilicon, silicomanganese, and ferrochrome are the most produced varieties.
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