Definition of Ferroalloy
Ferroalloy is an alloy composed of one or more metal or non-metal elements and 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. Silicon in ferrosilicon mainly exists in the form of FeSi and FeSi2, especially FeSi is relatively stable. The melting points of different components of ferrosilicon are also different. For example, the melting point of 45% ferrosilicon is 1260°C, and the melting point of 75% ferrosilicon is 1340°C. Ferromanganese is an alloy of manganese and iron, which also contains carbon, silicon, phosphorus, and other small amounts of other elements. 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 silicon-manganese alloys.
Ferroalloy is not a metal material that can be used directly but is mainly used as an intermediate raw material for deoxidizers, reducing agents, and alloy additives in steel production and casting industries.
Classification of Ferroalloys
With the development of modern science and technology, various industries have increasingly higher requirements for the variety and performance of steel, which has also put forward higher requirements for ferroalloys. There are many varieties of ferroalloys and many classification methods. They are generally classified according to the following methods:
(1) According to the classification of the main elements in iron alloys, they can be divided into silicon, manganese, chromium, vanadium, titanium, tungsten, molybdenum, and other series of iron alloys.
(2) According to the carbon content in ferroalloys, they can be divided into high carbon, medium carbon, low carbon, micro carbon, ultra-micro carbon, and other varieties.
(3) According to the production method, it can be divided into blast furnace ferroalloys, electric furnace ferroalloys, external furnace ferroalloys (metal thermal process) ferroalloys, vacuum solid-state reduction ferroalloys, converter ferroalloys, electrolytic ferroalloys, etc. In addition, there are also special iron alloys such as oxide compacts and heating iron alloys.
(4) Classified by two or more alloying elements contained in multicomponent ferroalloys, the main varieties are silicon-aluminum alloys, silicon-calcium alloys, silicon-manganese aluminum alloys, silicon-calcium aluminum alloys, silicon-calcium barium alloys, silicon-aluminum barium-calcium alloys wait.
Uses of Ferroalloys
Ferroalloy is one of the important raw materials essential for the steel industry and mechanical casting industry. With the continuous and rapid development of Cina’s steel industry, the variety of steel continues to expand and the quality improves, which puts forward higher requirements for ferroalloy products.
(1) Used as deoxidizer. The binding strength of various elements in molten steel to oxygen, that is, the deoxidation ability, is in order from weak to strong as follows: chromium, manganese, carbon, silicon, vanadium, titanium, boron, aluminum, zirconium, and calcium. Generally, iron alloys composed of silicon, manganese, aluminum, and calcium are commonly used for deoxidation in steelmaking.
(2) Used as alloy agent. The elements or alloys used to adjust the chemical composition of steel to alloy steel are called alloying agents. Commonly used alloying elements include silicon, manganese, chromium, molybdenum, vanadium, titanium, tungsten, cobalt, boron, niobium, etc.
(3) Used as casting crystal nucleus inoculant. To change the solidification conditions, certain iron alloys are usually added as crystal nuclei before pouring to form the center of the grains, so that the formed graphite becomes fine and dispersed and the grains are refined, thereby improving the performance of the casting.
(4) Used as a reducing agent. Ferrosilicon can be used as a reducing agent for the production of ferromolybdenum, ferrovanadium, and other iron alloys. Silicon-chromium alloy and silicon-manganese alloy can be used as reducing agents for refining medium-low carbon ferrochrome and medium-low carbon ferromanganese respectively.
(5) Other uses. Ferrous alloys are also increasingly used in the non-ferrous metallurgical and chemical industries.
LSFerroalloy Manufacturers and Suppliers
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