Basic use
As a steelmaking deoxidizer, silicon manganese, ferromanganese and ferrosilicon are widely used. Strong deoxidizers are aluminum (aluminum iron), silicon calcium, silicon zirconium, etc. (see the deoxidation reaction of steel). Commonly used as alloying additives are: ferromanganese, ferrochrome, ferrosilicon, ferro-iron, ferromolybdenum, ferrovanadium, ferrotitanium, nickel-iron, bismuth (iron), rare earth iron alloy, boron iron, phosphorus iron and the like. According to the steelmaking needs, various ferroalloys have many grades according to the alloying element content or the carbon content, and strictly limit the impurity content. An iron alloy containing two or more alloying elements is called a composite iron alloy. The use of such iron alloys can simultaneously add deoxidizing or alloying elements, which is advantageous for the steel making process, and can comprehensively utilize the symbiotic ore resources more economically and rationally. Commonly used are: manganese silicon, silicon calcium, silicon zirconium, silicon manganese aluminum, silicon manganese calcium and rare earth silicon iron.
Pure metal additives for steelmaking include aluminum, titanium, nickel and metal silicon, manganese metal, metal chromium and the like. Some easily reducible oxides such as MoO and NiO are also used in place of iron alloys. In addition, there are also iron nitride alloys such as ferritic iron, ferromanganese, etc., and heat-generating iron alloys mixed with a heat-generating agent.
Basic classification
There are many varieties of ferroalloys, and the classification methods are generally classified according to the following methods:
(1) According to the main elements of iron alloys, there are mainly series of iron alloys such as silicon, manganese, chromium, vanadium, titanium, tungsten and molybdenum.
(2) According to the classification of carbon content in ferroalloys, there are high carbon, medium carbon, low carbon, micro carbon, ultra micro carbon and other varieties.
(3) Multi-component iron alloys containing two or more alloying elements, the main varieties are silicon aluminum alloy, silicon calcium alloy, manganese silicon aluminum alloy, silicon calcium aluminum alloy, silicon germanium calcium alloy and the like.
(4) According to the production method: there are blast furnace iron alloy, electric furnace iron alloy, furnace external method (metal thermal method) iron alloy, vacuum solid-state reduced iron alloy, electrolytic method iron alloy, in addition to special iron alloy such as oxide briquetting and heating iron alloy.
Ferrosilicon, ferromanganese, silicomanganese, ferrochrome, tungsten iron, ferrovanadium, nickel iron, ferromolybdenum, ferrotitanium, rare earth magnesium silicon, rare earth ferrosilicon, silicon calcium alloy, silicon germanium alloy, silicon aluminum alloy, tantalum, Phosphorus iron, boron iron, etc.
