Explanation

alloy is composed of not less than 4% iron and one or more other metal or non-metallic elements, most of which are metals, but also some non-metallic elements such as silicon, boron, phosphorus, etc. It is added as deoxidizer, desulfurizer and alloy element additive in steelmaking, or not added as inoculant, modifier and alloy element additive in cast iron production. There are many varieties of ferroalloy, mainly ferrosilicon, ferromanganese and ferrochromium K series. The total output accounts for more than 95% of the total output of ferroalloy, followed by ferrotitanium, ferrotungsten, ferromolybdenum, ferrovanadium, etc. According to different production furnaces, alloy can be divided into electric furnace ferroalloy, blast furnace ferroalloy, converter ferroalloy, vacuum furnace ferroalloy, thermal melting furnace ferroalloy, etc. The main production methods include carbon thermal method, metal thermal method, electro silicon thermal method, refining method, and electrolysis method. The variety, quality and price of ferroalloy have an important impact on the development of steel production, so ferroalloy production has been developing correspondingly with steel production. And with the increasing ratio of alloy steel and continuous casting, the ratio of ferroalloy output to steel output has been increasing, and the variety of ferroalloy has also been increasing. The production of ferroalloy consumes high energy and contains a variety of precious metal elements. Therefore, the key to the production of ferroalloy is to reduce energy consumption, improve metal yield and reduce production costs. GB/T3650-2008 has clear provisions on the mandatory elements and marks of ferroalloy products. The ferroalloy grades are represented by iron element symbols and alloy element symbols plus percentage content. If necessary, control impurity element symbols and percentage content are also added. For example, FeCr65C1.0 represents ferrochromium alloy with 65% chromium content and less than 1.0% carbon content.

Classification