High carbon silicon for reinforcing steel
Jul 04, 2022
1. The influence of silicon on the microstructure and heat treatment of steel
1) As an alloying element in steel, its mass fraction is generally not less than 0.4%, and it exists in ferrite or austenite in the form of solid solution, which can reduce the austenite phase region.
2) Increase the annealing, normalizing and quenching temperatures to improve hardenability in hypoeutectoid steels.
3) Silicon does not form carbides, which can strongly promote the graphitization of carbon. In medium carbon steel and high carbon steel with high silicon content, if there is no strong carbide forming element, graphitization easily occurs at a certain temperature.
4) In carburized steel, silicon can reduce the thickness of the carburized layer and the concentration of carbon.
5) Silicon has a good deoxidation effect on molten steel.
2.The influence of silicon on the mechanical properties of steel
1) Improve the hardness and strength of ferrite and austenite, and its effect is stronger than that of manganese, nickel, chromium, tungsten, aluminum, vanadium, etc.. Significantly improve the elastic limit, yield strength and yield ratio of steel, and improve fatigue strength.
2) When the mass fraction of silicon exceeds 3%, the plasticity and toughness of the steel are significantly reduced.
3) A band-like structure is formed in the steel, resulting in lower lateral performance than longitudinal performance.
4) Improve the wear resistance of steel.
3. The influence of silicon on the physics, chemistry and processing technology of steel
1) Reduce the density, thermal conductivity, electrical conductivity and temperature coefficient of resistance of steel.
2) The eddy current loss of silicon steel sheet is significantly lower than that of pure iron, and the coercivity, magnetoresistance and hysteresis losses are lower, and the magnetic permeability and magnetic induction are higher.
3) Improve the oxidation resistance of steel at high temperature.
4) The weldability of steel is deteriorated.
5) Steel with a mass fraction of silicon exceeding 2.5% is difficult to plastically process.
So high carbon silicon can be used to produce reinforcing steel.
