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A crude ferroalloy containing chromium.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also ferrochrome), a ferroalloy containing approximately 70 percent Cr (Fe and impurities constituting the remainder). Chromium ores (52–58 percent Cr2O3) serve as the raw material in the production of ferrochromium.

High-carbon ferrochromium (6–8 percent C) is produced in ore-reducing furnaces, while the alloy’s refined grades, a category including medium-carbon (0.8–1.5 percent C), low-carbon (0.1–0.5 percent C), and carbon-free (0.01–0.06 percent C) ferrochromium, are produced in electric refining furnaces by the silicothermic method. Medium-carbon ferrochromium is also produced in special converters from the high-carbon grade, and carbon-free ferrochromium is also produced by mixing chromium-calcium and silicon-chromium melts in a ladle. Carbon-free ferrochromium is obtained in briquette form by the decarbonization of briquetted powders of the medium-carbon and high-carbon grades of ferrochromium in a vacuum furnace at 1380°C; if at the end of this process the furnace is filled with nitrogen, nitrided ferrochromium (approximately 6 percent N) is obtained. Ferrochromium is used for alloying steel, and foundry ferrochromium serves as an intermediate in the production of ferrochrome silicon.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
[33.] Axelsson G., Rylander R., Schmidt A.: Mortality and incidence of tumours among ferrochromium workers.
Combined effects of fly ash and waste ferrochromium on properties of concrete.
Chromite ore producers wanted to export more ore, while ferrochromium producers wanted to limit Chromite ore exports to secure their source of ore.
In order to obtain pigment, [Cr.sub.2][O.sub.3], CoO, [Al.sub.2][O.sub.3] and ferrochromium fly ash (Table 1) provided by the Ferrochromium Plant located in Antalya, Turkey, are used.
Chromite, when smelted into ferrochromium alloys, is used in the production of stainless steel.
The Macalloy site had been previously improved with an industrial manufacturing facility that produced ferrochromium alloy.
The metal-intermediate product was alloyed in the furnace using carbonaceous ferrochromium, having preliminarily deoxidized pool with approximately 1 kg/t of aluminium, then it was tapped into the ladle with separation of the furnace slag and creation in the ladle of oxide-fluoride slag of the CaO-Ca[F.sub.2] system with ratio of components 4:1.
Tororde asserted that the combination of lower stainless scrap ratios in the West and of higher stainless production in China is expected to add more than 1.1 million tons of ferrochromium into the market.
in 1968, has manufactured a stainless steel material called high-carbon ferrochromium. It is owned 65% by Showa Denko, 20% by Nisshin Steel and 15% by second-tier chemical manufacturer Tokuyama Corp.
Its reserves of chrome and manganese ore are the largest found in any single country, and South Africa is the world's leading producer of alumino-silicates, chrome ore, ferrochromium, gold, and platinum-group metals.