Using method of low-melting point and high-activity molten slag

Abstract

The invention discloses a using method of low-melting point and high-activity molten slag. The molten slag is applied to preparing high pure and high manganese steel, in the charging smelting step ofpreparing the high pure and high manganese steel, when furnace charge melts to form molten steel, the surface of the molten steel is covered with the molten slag, until the furnace charge melts down,and after the steps of adjusting mechanical components, cooling in a furnace and temperature control tapping to prepare the high pure and high manganese steel. The molten slag has lower melting pointand high activity, rapidly melts under the condition of intermediate frequency furnace smelting, participates in metallurgical reaction sufficiently, deoxygenation, dehydrogenation, impurity removal and other capacity are high, the quality of the molten steel is greatly improved, and the preparation of the high pure and high manganese steel is facilitated.

Description

technical field [0001] The invention belongs to the field of high-performance new materials and metallurgy technology, and in particular relates to a method for using slag with a low melting point and high activity. Background technique [0002] High manganese steel is a traditional wear-resistant material. After more than one hundred years of development, three series of manganese 13, manganese 18 and manganese 25 have been formed. Among them, manganese 13 has formed international and domestic standards and is relatively mature. Manganese 18 has only international standards, and manganese 25 is more difficult to produce, so there are only internal standards for the company for the time being. Because the microstructure of high manganese steel is single-phase austenite or austenite with a small amount of carbide, it has good toughness and plasticity, and the crack growth rate is very low, so it is safe and reliable to use. Another feature is that under the action of a lar...

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Problems solved by technology

[0016] At present, most of the domestic smelting equipment and processes adopt the non-oxidizing smelting process, but the current system for refining high manganese steel has the following disadvantages: First, it cannot detect the washing degree of the argon gas to the furnace lining during the purification process of high manganese steel liquid, and the choice is better Second, when the molten high manganese steel leaks out of the furnace lining and conducts with the furnace shell, it cannot well avoid the occurrence of furnace accidents; the third is to purify the refined high manganese steel for oxygen and The hydrogen effect is poor, which affects the quality of the product; Fourth, the quality of the breathable brick used in the refining high manganese steel system is poor, which affects the effect of argon blowing, thereby affecting the purification effect of oxygen and hydrogen in the refined steel water. Therefore, in view of the above defects, Urgent need to improve the existing medium frequency induction furnace

[0019] (1) During the use of traditional permeable bricks, due to the sharp change of the use temperature, problems such as peeling and falling blocks are prone to occur; some even break during use, resulting in unsmooth blowing of argon, and serious leakage of molten steel

No matter the air blowing is not smooth or the molten steel leaks, it will seriously affect the normal smelting of the steel plant and cause losses to varying degrees. Therefore, it is very necessary to solve problems such as peeling, falling blocks, and fractures of the ventilating bricks.

[0020] (2) At present, the corundum-spinel air permeable bricks commonly used in China are prone to volume expansion in high temperature environments due to the material’s own characteristics. Once the air permeable seam design is unreasonable, air blowing will not be smooth due to expansion. Phenomenon, so that some or all of the ventilation bricks lose the ventilation function

[0021] (3) The medium and low temperature strength of the product is low, and there is a strength inflection point at medium temperature

[0022] (4) The volume of each temperature section of the product is unstable, and cracks are prone to occur during use

[0023] (5) High firing cost

[0024] (6) Long production cycle

However, too much slag removal will cause secondary oxidation on the surface of molten steel, and at the same time, the temperature of molten steel will drop faster, and it will not solve the problems of slag being too sticky and impurities unable to float up and the ladle not sticking to slag. It only reduces the speed of sticking slag on the steel wall.

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