Non-oriented silicon steel RH refinement and deoxidation control method

Abstract

The invention discloses a non-oriented silicon steel RH refinement and deoxidation control method. The method includes the following steps that firstly, the non-oriented silicon steel includes the following mass percent of smelted components: less than or equal to 0.005 percent of C, 0.25-2.5 percent of Si, 0.10-0.50 percent of Mn, less than or equal to 0.08 percent of P, less than or equal to 0.005 percent of Al, less than or equal to 0.008 percent of S, less than or equal to 0.003 percent of N, and the rest percent of Fe and unavoidable impurities; secondly, the smelted molten steel is processed by the RH refinement method and when the RH refinement begins, the molten steel temperature is higher than the melting point of steel by 60-150 DEG C and the carbon content of the molten steel is controlled within 0.02-0.06 percent which refers to mass percent; when decarbonization in RH refinement is ended, the free oxygen content in the molten steel is 250-550ppm; deep deoxidization is made after decarbonnization, and the input amount of the deoxidizing agent Y = K * (The oxygen concentration at the end of decarbonization (ppm)-50), wherein, the deoxidization agent is aluminum, silicoferrite or threadlike carbon. The invention has the advantages of reducing the impurity quantity in the steel, changing the morphology, realizing the deoxidized refinement control in the RH refinement process and improving the product performance.

Description

technical field [0001] The invention relates to the metallurgical technology of non-oriented silicon steel, in particular to a method for controlling the RH refining deoxidation of non-oriented silicon steel. Background technique [0002] With the continuous improvement of users' requirements for the quality of non-oriented silicon steel, the application of RH refining is also increasing. At the same time, higher requirements are put forward for the process control of RH refining. The technical characteristics of RH treatment are mainly through the circulation of molten steel in the vacuum tank and ladle, supplemented by blowing oxygen with the top gun, to achieve decarburization, degassing, adjust the temperature and composition of molten steel, and remove inclusions in molten steel And other metallurgical functions. [0003] In the current RH refining process for the production of non-oriented silicon steel, in order to reduce the difficulty of operation, operators often ...

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Problems solved by technology

[0004] It can be seen from the above that the currently used RH refining deoxidation control method cannot finely control the deoxidation in the RH refining process, and whether the oxygen content in molten steel and the resulting oxidized inclusions can be fully removed when the alloy is put in will directly affect affect product quality

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