Views:1 Author:Site Editor Publish Time: 2019-11-07 Origin:Site
Compared with ordinary electric arc furnaces, medium frequency induction furnaces have the following characteristics in terms of refining capacity and adaptability.
1. Characteristics in terms of refining ability
The electric arc furnace is stronger than the induction furnace in removing phosphorus, sulfur and deoxidation. The induction furnace is cold slag, and the slag temperature is supplied by the molten steel to hold the heat. The electric arc furnace is hot slag, and the slag is heated by the arc. The slag can complete the dephosphorization and desulfurization tasks, and the slag is fully diffused and deoxidized. Therefore, the ability of the electric arc furnace to remove phosphorus, sulfur and deoxidation is better than induction furnace
The electric arc furnace has higher chlorine content than the induction furnace because the ammonia molecules in the high temperature region of the arc are ionized into atoms and absorbed by the copper liquid. The nitrogen content of the induction furnace is lower than that of the electric arc furnace, and the oxygen content is higher than that of the electric arc furnace. The fast life value of the alloy is higher than that of the electric arc furnace.
2. The yield of elements of the alloy is high.
The yield of alloying elements in induction furnaces is higher than that of electric arc furnaces. The volatilization and oxidation loss of the element is high at high arc temperatures. The burning rate of the alloying elements in the induction furnace is lower than that of the electric arc furnace. In particular, the burning rate of the alloying elements in the return material charged in the furnace is much higher than that of the induction furnace.
When the induction furnace is cured, it can effectively collect the alloying elements in the returned material. When the electric arc furnace is being treated, the alloying elements in the raw materials are first oxidized into the slag, and then returned to the molten steel from the slag, and the burning loss rate is obviously increased.
When returning to the material, the alloying element yield of the induction furnace is significantly higher than that of the electric arc furnace. For example, aluminum yield induction furnace is 92% 96%, electric arc furnace is 85% 90%, tungsten yield induction furnace is 90% 94%, and electric furnace is 85%-90%. The alloy element has a large loss of volatilization at the high temperature of the arc, and the induction furnace loses less by melting the alloy element by induction heating.
3. The molten steel has low carbon content during the refining process.
The induction furnace relies on the principle of induction heating to melt the metal charge without the carbon increase of the molten steel. The electric arc furnace relies on a stone electrode to heat the charge through an electric arc. After the culture, the molten steel will increase carbon. Under normal conditions, when the high-alloy nickel-chromium steel is treated, the minimum carbon content of the electric arc furnace is 0.06%, and the induction furnace can reach 0.020%. The amount of carbon added in the electric arc furnace treatment process is 0.020%, induction furnace is 0.010% Non-vacuum neutral induction furnace suitable for the treatment of low carbon high alloys and alloys
4. Thermodynamic and kinetic conditions for the process of changing steel to steel
The moving condition of the molten steel in the induction furnace is better than that of the electric furnace. For this purpose, the electric furnace must be equipped with a low-phase electromagnetic device, which is still not as effective as the induction furnace.
The electromagnetic stirring action in the induction furnace improves the reaction kinetic conditions and promotes the homogenization of the molten steel temperature and composition, but excessive stirring is not conducive to the inclusion removal and damage to the furnace. 5. Process parameters of the refining process are easy to control.
Induction furnace control temperature, refining time, stirring strength and maintaining constant temperature are more convenient than electric arc furnace, can be carried out at any time
Because of the above characteristics of induction furnaces, tactical players are more important in the treatment of high alloy steels and alloys. It can produce products independently, and can also be combined with electroslag remelting, direct air consumption and other secondary refining to form a double process for production. Therefore, non-vacuum induction furnace treatment has become an important smelting method for the production of high-speed, hot steel, stainless steel, electrothermal alloy, precision alloy, high-temperature alloy and other special steels and alloys, and has been widely used.