A Method for Improving the Quality of Electromagnetically Stirred Slab Hot Rolling

Abstract

The invention relates to a method for improving the hot rolling quality of electromagnetically stirred slabs, which comprises the following steps: (1) calculating the existing alumina quality in steel slag, denoted as m[Al 2 O 3 ] 1 ; According to the free oxygen content m[O] of the ladle after decarburization in the refining process, calculate the mass of alumina produced m[Al 2 O 3 ] 2 =m[O]×102 / 48; (2) control of CaO and Al after refining 2 O 3 The weight ratio is 1.1-1.2; according to the weight ratio range and the weight of CaO, calculate the Al 2 O 3 The total weight that needs to be achieved m[Al 2 O 3 ]; (3) Calculating the Al that needs to be supplemented when the converter tapping is completed 2 O 3 Total weight m[Al 2 O 3 ] 3 : m[Al 2 O 3 ] 3 =m[Al 2 O 3 ]‑m[Al 2 O 3 ] 1 ‑m[Al 2 O 3 ] 2 . Under the condition of giving priority to the purity of molten steel, the present invention provides specific control measures for the main technical characteristics of the purity of molten steel, starting from the converter and refining, and controlling the inclusions in the steel at the source in the steelmaking process. On this basis, the purity of molten steel is improved by optimizing the use of electromagnetic stirring in continuous casting.

Description

technical field [0001] The invention belongs to the field of improving steelmaking technical products, in particular improving the quality of continuous casting slabs, in particular to a method for improving the hot rolling quality of electromagnetically stirred slabs. Background technique [0002] As far as the current technology is concerned, patent applications can retrieve a large number of electromagnetic stirring equipment, cooling, and windings, that is to say, there are a large number of patents to explain how to realize electromagnetic stirring. However, in the casting process of certain electromagnetic stirring equipment on a fixed mold and the corresponding refined molten steel, the more suitable setting position of the liquid level of the mold is that the electromagnetic stirring magnetic field strength is applied to the mold. , especially the range of the upper end of the crystallizer, few answers are given from the current patents. For example, the patent publ...

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Problems solved by technology

However, during the rolling process of the liquid surface, the emulsification of the mold powder is increased, resulting in the inclusion of the mold powder, and the defect of the mold powder being involved will occur

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