Silicon carbon alloy powder as a new type of steel deoxidizing agent, can replace ferrosilicon, silicon carbide, carburizing agent. Therefore, in steelmaking, through the use of silicon carbon alloy powder, in addition to achieving a good deoxidation effect, but also reduce the amount of deoxidizer, reduce production costs. Under normal circumstances, silicon carbon alloy powder is mainly used for converter smelting deoxidation alloying process, and the deoxidation effect is stable, the chemical composition of steel, mechanical properties, internal control quality are better than the traditional steel process.
In general, the addition of silicon carbon alloy powder in steelmaking can change the quality of molten steel, improve the quality of steel, and improve the overall performance of steel. At the same time, it can also reduce the cost of steelmaking and increase the economic benefits of steel mills by reducing the amount of human alloy added.
The use of electric furnace and AOD steelmaking process to produce stainless steel has the following advantages:
1. the A0D production process has low requirements for raw materials, and the C content of the electric furnace steel can reach about 2%, so it can use cheap high-carbon FeCr and 20% stainless steel scrap as raw materials, reducing the operating cost.
2. the A0D method can step the carbon in the molten steel to 0.08%, if the smelting time is extended, increase the amount of Ar, can further remove the molten steel to less than 0.03%, in addition to ultra-low carbon. In addition to ultra-low nitrogen stainless steel, 95% of the varieties can be produced.
3. stainless steel production cycle is relatively short VOD, flexibility is better.
4. the total investment in production system equipment is more expensive than VOD.
5. A0D furnace production step into steel, less personnel, less equipment, so the comprehensive cost is low.
6. AOD can use primary steelmaking water containing less than C1.5%, so it can use low-cost and high-carbon FeCr, FeNi40 and 35% carbon steel scrap for ingredients, and the raw material cost is low.
Stainless steel with its excellent performance, corrosion resistance, rust resistance and heat resistance characteristics should be widely used in various fields, especially the recent rapid rise in the automotive industry, water industry, environmental protection industry, home appliances industry, major industrial facilities in the field of application, so that the market demand for stainless steel continues to increase, and more and more higher alloy steel grades continue to develop. Therefore, the demand for chromium-nickel elements in the production of stainless steel is increasing
Silicon carbon alloy powder with quartz sand, petroleum coke (or coal coke), wood shoulder (the production of green silicon carbide need to add salt) and other raw materials through the resistance furnace high temperature smelting.
Silicon carbide is also a rare mineral found in nature. In the contemporary C, N, B and other non-oxide high-tech refractory raw materials, silicon carbon alloy powder is the most widely used, the most economical one, can be used as a purification agent for smelting steel, that is, used as a steel deoxidizer and cast iron tissue improver, in order to reduce costs.
Silica carbide powder due to stable chemical properties, high thermal conductivity, small thermal expansion coefficient, good wear resistance, in addition to abrasive, there are many other uses, such as: with a special process to coating silica carbide powder on the inner wall of the turbine impeller or cylinder body, can improve its wear resistance and extend the service life of 2 times;
Used to make high-grade refractory material, heat resistance, small size, light weight and high strength, good energy saving effect. Silicon carbon alloy powder is an excellent deoxidizer, which can speed up the steel making speed, facilitate the control of chemical composition and improve the quality of steel. In addition, silicon carbon alloy powder is also widely used in the production of electric heating element baby carbon rod.
By controlling the amount of silicon and carbon in the silicon carbon alloy powder, adding lime in the slag process, controlling the basicity of the slag, and adding silicon carbide in the smelting, reduction and steel process, the chromium content in the slag is reduced, and the utilization rate of chromium in the smelting process is improved.
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