Ferro alloy products contain a certain amount of silicon element, silicon element plays an important role in steelmaking, in steelmaking are required to deoxidize molten steel, silicon element and oxygen have good affinity easy to produce silicon dioxide can achieve the purpose of deoxidization. The common ferro alloy products containing silicon elements are ferro silicon, silicon metal, barium silicon, silicon carbon alloy, silicon carbide and other silicon-containing products with good deoxidation effect.
In the process of steelmaking, add silicon as a reducing agent and deoxidizer, so steel contains 0.15% to 0.30% of silicon, if the amount of silicon in the steel exceeds 50% to 0.60%, silicon is even ferro alloy element, silicon element can improve the elasticity of steel, yield point and tensile strength, so widely used as spring steel.
In the tempered structural steel to add 1.0% to 1.2% of silicon, the strength can be increased by 15% to 20%, silicon and molybdenum, tungsten, chromium and other combination, has the use of improving corrosion resistance, can produce heat-resistant steel, silicon containing 1% to 4% of low carbon steel, with extremely high permeability, for the electrical industry to do silicon steel sheet, silicon increase, will reduce the welding performance of steel.
As a strengthening element, silicon can effectively improve the mechanical strength of steel, and can improve the quenching and hardening ability of steel, so that steel has better mechanical properties such as pressure resistance and impact resistance. At the same time, the addition of silicon can also improve the bending performance of steel, making steel more superior in applications such as cantilever beams.
The addition of silicon in steel also has an important impact on the design and control of heat treatment process. Because the solid solubility of silicon is different under different temperature conditions, the formation and precipitation behavior of silicon in steel under different heat treatment conditions at different times is also different, and the strengthening effect of steel is also different. For example, when the temperature range of steel is 600-800 ° C, silicon will increase the strength and hardness of steel; However, after the steel is welded, the toughness is reduced and the risk of cracking is increased.
The addition of silicon can also improve the corrosion resistance and wear resistance of steel. Silicon can promote the surface of the steel to be covered by oxide film, thus protecting the steel from corrosion; At the same time, the addition of silicon can also improve the wear resistance of steel and greatly increase the service life of steel.
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