Ferrochromium is an iron alloy composed of chromium and iron. It is an important alloy additive in steelmaking. According to different carbon content, ferrochromium is divided into high carbon ferrochromium (4~8% carbon content), medium carbon ferrochromium (0.5~4% carbon content), low carbon ferrochromium (0.15~0.50% carbon content), Micro-carbon ferrochromium (with carbon content of 0.06%), ultra-fine carbon ferrochromium (with carbon content of less than 0.03%), as well as silicon-chromium alloy, ferro-chromium nitride, etc.

The lower the carbon content of ferrochromium, the more difficult it is to smelt, the power consumption is also large, and the cost is high. Ferrochromium with a carbon content of less than 2% is suitable for smelting stainless steel, acid-resistant steel and other low-carbon chromium steels. Ferrochromium with a carbon content of more than 4% is often used to make ball bearing steel and steel for auto parts. Ferrochromium with a chromium content of about 5% can be used as a chromium addition agent for alloy transfer iron.

application

Chromium is one of the important strategic materials. It has the characteristics of hardness, wear resistance, high temperature resistance and corrosion resistance. The uses of its chromite are:

(1) In the metallurgical industry， Chromite is mainly used to produce ferrochrome and metallic chromium. a Ferrochromium alloy is used as a steel additive to produce a variety of high-strength, corrosion-resistant, wear-resistant, high-temperature, and oxidation-resistant special steels， Such as stainless steel, acid-resistant steel, heat-resistant steel, ball bearing steel, spring steel, tool steel, etc. b Metal chromium is mainly used for smelting special alloys with cobalt, nickel, tungsten and other elements. These special steels and special alloys are indispensable materials for the production of guns, missiles, rockets, ships, etc. in the aviation, aerospace, automobile, shipbuilding and defense industries.

(2) Among the refractories? Chromite is used to make chrome bricks, chrome-magnesium bricks and other special refractories.

(3) In the chemical industry, it is mainly used to produce sodium dichromate, and then to prepare other chromium compounds. It is used in pigments, textiles, electroplating, leather making and other industries. Therefore, there are three sales channels for chromite, namely, metallurgical industry, refractory industry and chemical industry. The following introduces the use and smelting process of ferrochromium and chromium salts from the use of chromite in the metallurgical industry
Chromium is one of the important strategic materials. It has been widely used in metallurgical industry, refractory material and chemical industry due to its properties of hardness, wear resistance, high temperature resistance and corrosion resistance.

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