Method for controlling nitrogen and sulfur contents of high-grade non-oriented silicon steel

Abstract

The invention provides a nitrogen and sulfur content control method for high-grade non-oriented silicon steel, and relates to the technical field of steelmaking. Comprising the following steps that S1, pretreatment desulfurization is conducted, specifically, molten iron is loaded into a converter according to 87-90% of metal materials, and the balance is self-produced waste steel; s2, converter smelting is conducted, specifically, slag materials with lime, dolomite and low-sulfur sintered ore as raw materials are added into a converter, the alkalinity is controlled to be 3.6 or above, argon bottom blowing is conducted in the whole smelting process, and lime and fluorite are added after converter tapping; s3, the steel ladle is directly conveyed to an RH furnace for treatment without deoxidation of the molten steel; S4, the steel ladle is hoisted for continuous casting; by improving and optimizing the process, the low-nitrogen and low-sulfur production without taking silicon steel is realized under the conditions of no equipment transformation or new equipment facilities, no additional production links and no increase of the production cost, so that the application requirements are better met.

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