Ferrochromium is an alloy of iron and chromium, containing, depending on the variety, not less than 60-65 % chromium, from 0.02 % to 9 % carbon, and impurities, depending on the brand: 1-8 % silicon, 0.02 to 0.1% phosphorus, 0.03 to 0.05 % sulfur, up to 0.02% aluminum, 1-6 % nitrogen.
Ferrochromium is an alloy of iron (Fe) and chromium (Cr), containing, depending on the variety, at least 60-65 % of chromium (Cr), from 0.02 % to 9 % carbon (C), and impurities depending on the brand: 1-8 % of silicon (Si), 0,02-0,1 % phosphorus (P), 0.03 to 0.05 % sulfur (S), up to 0.02 % of aluminium (Al), 1-6 % nitrogen (N).
Ferrochromium by the carbon content in mass percentage is divided into the following groups:
– low carbon – containing carbon up to 0.5 %;
– medium-carbon – containing carbon from 0.5% to 4.0%;
– high-carbon – containing carbon from 4.0 to 9.0 %;
– low carbon nitrided with a nitrogen content of from 1.0 to 6.0 %.
Ferrochromium is used for the production of stainless steel, alloying steel and alloys. The content of chromium in stainless steel is approximately 12 to 20 %. Ferrochromium is included in the tool, die (for both hot and cold deformation), and high-speed steel. Chrome and chromium steels and alloys used in the manufacture of armor, various safes and some of the details for rocket.
– temperature of melting of carbon ferrochromium – 1470-1540 OS
– the melting temperature of carbon-free ferrochromium – 1600-1640 OS
– when you add chromium to steel in the composition of the ferrochromium decreases the grain size of steel,
– reducing the tendency of the end of steel and alloys to overheat,
– increases hardenability end of steel and alloys,
– increases the temperature of annealing and quenching,
– increases hardness, toughness, wear resistance and ultimate strength of steel and alloys, including high temperature,
– increases the resistance of steel and alloys to oxidation at high temperatures,
– increases the heat resistance of the final steel and alloy.