Process for removing nonmetal inclusion in molten steel

Abstract

The invention relates to a method for removing non-metallic inclusion in molten steel. The method comprises the following steps that: (1) a ladle filled with the molten steel is hoisted onto a slewing table, argon is blown through an argon blowing hole to stir, and the blowing argon is stopped after 2 minutes at most; (2) one or a plurality of amplitude varying poles are dipped into the molten steel, and an ultrasonic generator is started; (3) after the ultrasonic generator is started for one minute at most, the ultrasonic generator is shut off, and the amplitude varying poles are immediatelydisengaged from the molten steel and are returned to the standby position. The method for removing the non-metallic inclusion in the molten steel can further reduce the inclusion quantity in the molten steel, and can produce the molten steel with adequate small inclusion quantity or adequate small inclusion size, thereby achieving the production requirement of high purity steel.

Description

technical field [0001] The invention relates to a method for smelting pure steel, in particular to a method for removing non-metallic inclusions in molten steel. Background technique [0002] With the continuous development of science, technology and economy, as well as the increasing quality and performance requirements of users for steel quality, the development of steel material design and application technology has become more and more important, and it has also brought great challenges to the iron and steel metallurgical industry. The focus of improving the quality of steel is to improve the purity of steel and strictly control the inclusions in steel. Generally, the cleanliness of the steel is represented by the total oxygen content T [0] in the steel. The total oxygen content includes free oxygen and fixed oxygen, that is, the oxygen contained in the inclusions. [0003] The production of pure steel mainly focuses on two aspects, (1) minimizing the content of impurit...

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Problems solved by technology

However, since the molten steel in the above-mentioned RH degassing ladle and in the tundish during the casting process is in a flowing state, the horn should not be immersed in the molten steel too deeply, and the position should not be too close to the molten steel flow area, otherwise it will be damaged by steel. The inclusions in the floating process are reintroduced into the molten steel by the liquid plume flow, so the effect area is small and the effect is limited

Moreover, the ultrasonic inclusion removal method needs to immerse the horn in high-temperature (about 1600°C) molten steel for a long time, and the horn consumes quickly and has a short life. Generally only 1 to 3 minutes, no more than 5 minutes at most, so it is difficult to realize in production

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