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Due to its excellent properties such as hardness, brittleness, and corrosion resistance, chromium is widely used in fields such as metallurgy, chemical industry, cast iron, refractory materials, and high-precision technology. The specific application proportions are shown in the following figure:
1, ferrochrome in the steelmaking process has to increase the antioxidant steel: in the steelmaking process into the ferrochrome can increase the antioxidant steel, ferrochrome in the chromium can protect the steel, so that the oxidation rate slows down to increase the antioxidant steel, with the advantages of enhancing the service life of the steel;
2, put the proportion of ferrochrome in steel water has to enhance the corrosion resistance of steel: in the process of steelmaking according to the content of elements in steel water in proportion to a certain amount of ferrochrome can enhance the corrosion resistance of steel, ferrochrome in the chromium can be attached to the surface of the steel to provide a layer of insulation and thus play a corrosion-resistant ability of the advantages.
3, ferrochrome has to enhance the hardness of steel and abrasion resistance: now the steelmaking process are generally put into the ferrochrome, the main reason is that ferrochrome can enhance the hardness of steel and abrasion resistance, ferrochrome chromium in the oxygen because of the element is not easy to combine, so you can enhance the steel oxidation resistance, in addition to ferrochrome can also be purified of impurities in steel to enhance the hardness of steel.
Due to the high melting point of chromite ore, which ranges from 1900°C to 2050°C, it can maintain its volume at high temperatures and does not react with any slag. Therefore, it can be used as a refractory material, serving as the lining of steel-making furnaces and various metal smelting furnaces. Thus, in the field of refractory materials, chromite ore is used to manufacture chromium bricks, chromemagnesite bricks, and other special refractory materials.
In addition, chromium is also applied in cast iron. For instance, cast iron in the chromium state has the characteristics of high strength, high elongation, high impact value, and low hardness.
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What is silicon carbide and what is its function?Silicon carbide, an inorganic substance with the chemical formula SiC, is smelted at high temperatures in resistance furnaces using raw materials such as quartz sand, petroleum coke (or coal coke), and wood chips (table salt is added to produce green silicon carbide). Silicon carbide is a semiconductor that exists in nature in the form of the extremely rare mineral moissanite. It has been mass-produced as powder and crystals since 1893, and is used as an abrasive and so on. Among the non-oxide high-tech refractory raw materials such as C, N and B, silicon carbide is one of the most widely and economically used, and can be referred to as golden steel sand or refractory sand. Chinese industrial production of silicon carbide is divided into two kinds of black silicon carbide and green silicon carbide, both are hexagonal crystals.
why should ferromanganese alloy be used in steelmaking, and the difference between different ferromanganese uses ？Manganese iron is an alloy composed of manganese and iron, mainly used in the steel-making process. Depending on the carbon content, manganese iron can be classified as low-carbon manganese iron, medium-carbon manganese iron, and high-carbon manganese iron. Low-carbon manganese iron has a carbon content of less than 0.7% and is mainly used to enhance the hardness and toughness of steel, as well as to play a role in deoxidation during the steel-making process; medium-carbon manganese iron has a carbon content ranging from 0.7% to 2.0%, and is suitable for different steel production requirements. The melting point of manganese iron is close to 1300℃, and its density is 7.2-7.3g/cm³.
What is silicon iron? What are the uses of silicon iron?Silicon iron is an indispensable deoxidizer in the steelmaking industry. In steel, silicon iron is used for precipitation deoxidation and diffusion deoxidation. Pig iron is also used as an alloying agent in steelmaking. Adding a certain amount of silicon to the steel can significantly enhance its strength, hardness, and elasticity, increase its magnetic permeability, and reduce the magnetic hysteresis loss of transformer steel. Generally, the silicon content in steel is 0.15% - 0.35%, in structural steel it is 0.40% - 1.75%, in tool steel it is 0.30% - 1.80%, in spring steel it is 0.40% - 2.80%, in stainless and acid-resistant steel it is 3.40% - 4.00%, in heat-resistant steel it is 1.00% - 3.00%, and in silicon steel it is 2% - 3% or higher.
High-silicon silicon iron or silicon-based alloys are used in the iron alloy industry as reducing agents for the production of low-carbon iron alloys. Adding silicon iron to cast iron can be used as a nucleating agent for ductile iron, and can prevent the formation of carbides, promote the precipitation and spheroidization of graphite, and improve the performance of cast iron.
In addition, silicon iron powder can be used as a suspension phase in the mineral processing industry, and as a coating for welding rods in the welding rod manufacturing industry; high-silicon silicon iron can be used in the electrical industry to prepare pure silicon for semiconductors, and in the chemical industry to manufacture silicone and other substances.
In the steelmaking industry, approximately 3 - 5 kg of 75% silicon iron is consumed for every ton of steel produced.
Melting point: 75FeSi is 1300℃
Silicon iron contains small amounts of metal compounds of phosphorus, such as calcium phosphide, etc. When exposed to moisture during transportation by vehicles or storage in warehouses, phosphine can be released, causing poisoning to people in the warehouse or surrounding areas. Severe phosphine poisoning can be fatal.
