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Ferroalloy The General Purpose
- May 27, 2017 -

 Ferroalloy Ferroalloy, generalized ferroalloy refers to the steel as a deoxidizer, elemental additives such as iron added to the steel with a certain characteristics or to meet a certain requirement of a product. Iron and one or several elements of the alloy, mainly for steel smelting. In the steel industry generally also all the steel used in the alloy, whether iron or not (such as silicon calcium alloy), are called "ferroalloy." It is customary to include certain pure metal additives and oxide additives.

 General purpose

  Ferroalloy Deoxidizer. In the steelmaking process to remove the oxygen in the molten steel, some ferroalloy can also remove other impurities in the steel such as sulfur, nitrogen and so on.

Alloy additive. According to steel composition requirements, add alloying elements to the steel to improve the performance of steel.

Inoculants. In the cast iron before the cast into the molten iron, to improve the casting of the crystal structure.

Reducing agent, the metal thermal reduction method to produce other ferroalloy and non-ferrous metal reducing agent; non-ferrous alloy alloy additives; also a small amount for the chemical industry and other industries.

Steel, all the steel is a kind of ferroalloy, which also makes the ferroalloy is the most widely used, the largest amount of alloy.

High school textbooks also put some high carbon iron and all iron-containing alloys all called ferroalloy.

  Ferroalloy nature

Ferroalloy of the main elements of the general melting point is high, or it is difficult to restore the oxide, it is difficult to refining pure metal, if together with the iron is easier to restore smelting. Iron and steel in the use of iron and steel smelting, which is not only harmless iron, and because it is easy to melt in the molten steel is more favorable. Therefore, the steelmaking process of deoxidation and the addition of alloys, mostly in the form of ferroalloy. Ferroalloys are generally brittle and can not be used as metal materials.

  Ferroalloy Refining

The use of crucible smelting low grade ferroalloy is about 1860 or so. Later developed with blast furnace smelting iron and silicon containing 12% or less of ferrosilicon. 1890 ~ 1910 years in France began to use electric arc furnace production of ferroalloy. Moissan (H.Moissan) used electric arc furnace on the difficult to restore elements of the system test, Ellu (PLTH □ roult) used in industrial production, were using coke and charcoal as a reducing agent to restore the ore, the product is mostly high-carbon of. After 1920, in order to meet the needs of high-quality steel and stainless steel development, began to produce a new phase of low-carbon ferroalloy. On the one hand, on the basis of the method of making the metal by the aluminum heat method proposed by K. Goldschmidt in 1898, it developed aluminum smelting ferroalloy and pure metal with aluminum heat. On the other hand, A desiliconization method for oxidizing a silicon - containing alloy in an electric furnace. As the aluminum production cost is too high, desilicon refining method has been more applications. Until now in the carbon, low carbon, micro carbon ferrochrome, medium carbon, low carbon ferromanganese, metal manganese mostly use this method refining. Refining ferrochromium heat exchange method that is the liquid ore, lime melt and silicon chromium alloy, through the heat to meet the accelerated reaction, is the further development of desilicon refining method. In addition, electrolytic production of pure alloy additives (such as metal manganese), and the use of vacuum decarburization production of ultra-low carbon black iron. Several years also developed the use of pure oxygen blowing refining ferrochrome, ferromanganese method.