Method for removing microscopic nonmetallic inclusion in molten steel by using nitrogen-increasing nitrogen-precipitating process

Abstract

A provided method for removing microscopic nonmetallic inclusion in molten steel by using a nitrogen-increasing nitrogen-precipitating process comprises introducing a soluble gas N2 into molten steel, or enable molten steel to be at an environment with relatively high nitrogen partial pressure, so as to enable the nitrogen content in the molten steel to be substantially increased; under the vacuum condition, separating out nitrogen form molten steel, and enabling nitrogen to be separated from the surface of the microscopic nonmetallic inclusion in the molten steel and form bubbles by controlling the separation speed, so as to enable bubbles and the inclusions to float upwards together; and further capturing the microscopic inclusions in the steel in the bubble upward-floating process, and enabling the bubbles and the inclusions to float upwards together. Because the upward floating speed of bubbles is fast, the upward-floating removal speed of the inclusions in steel can be substantially improved. The nitrogen bubble generated by using the method is fine in dimension and is distributed in a dispersive way, and the inclusion removal effect is obvious.

Description

Technical field [0001] The invention belongs to the field of metallurgical technology, and relates to a technique for removing inclusions in molten steel, in particular to a method for removing microscopic non-metallic inclusions in molten steel by nitrogen-increasing and nitrogen evolution method, which can significantly promote microscopic inclusions in molten steel To improve the cleanliness of molten steel. Background technique [0002] Inclusions in steel often harm the performance of steel. Although metallurgical technology has progressed rapidly in recent years and the cleanliness of steel has improved rapidly, the control of inclusions in steel often cannot fully meet the requirements of high-quality steel, especially the size of steel. The control of small (≤10μm) microscopic inclusions has always been a difficulty in the production of some high-quality steels. [0003] A large number of studies have shown that blowing inert argon gas into the molten steel through the bot...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for removing microscopic non-metallic inclusions in molten steel by

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