Application direction of intermediate frequency furnace refining

With the development of science and technology, the requirements for the strong resistance of steel materials are getting higher and higher. The purification of molten steel is an important means to improve the strong resistance of steel and improve the quality of steel, and it is also one of the goals pursued by domestic and foreign iron and steel enterprises. It affects the purity of molten steel. There are mainly two types of doping sources, one is from steel slag, molding sand and refractory materials, which is called foreign doping. The second is the chemical reaction product of the reoxidation process and the action of deoxidizer in the molten steel, accounting for about 100% of the doping in the steel. The micro-doping of oxides (particle diameter of more than 10 μm) is the main reason for the appearance and internal defects of steel castings. Therefore, controlling the amount, size, shape and composition of the doping is important to control the melting process. Content. Refining processes such as argon purification, argon-oxygen decarburization, AOD, VOD and LF have become more advanced processes for producing high-purity molten steel. Although AOD, VOD and other refining methods have good effects, the equipment investment and operating costs Very high, not suitable for a large number of small and medium foundries.

The steelmaking equipment used in domestic small and medium-sized enterprises and scientific research institutes is mainly intermediate frequency furnaces. Due to the small amount of molten steel smelted, it is not suitable for the refining process of ladle outside the furnace, and various inclusions cannot be effectively removed, resulting in the yield of castings. Low, poor quality, low grade and other problems. Breathable bricks are widely used in large converters, ladle and aluminum-smelting holding furnaces, and through powder spraying and air blowing methods to purify molten steel, it has become a high-quality and high-value-added steel for large iron and steel enterprises. A necessary part of the production process. In this paper, the bottom-blowing argon refining process of breathable bricks is used in the intermediate frequency furnace to realize the refining of molten steel, in order to explore a suitableIntermediate frequency furnace refiningmethods to improve the quality and grade of steel.

The advantages of using air-permeable bricks to refine molten steel in the intermediate frequency furnace:

(1) It replaces the process of ladle refining outside the furnace, reducing energy consumption and production costs.

(2) The molten steel refining process is simplified, labor time is shortened, and labor intensity is reduced.

(3) Argon blowing in the intermediate frequency furnace does not change the heating method of the molten steel, and the temperature of the molten steel is easy to control.

(4) Blowing argon can improve the stirring function of the molten steel and ensure the uniformity of the temperature and composition of the molten steel.