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Method for improving hot rolling quality of electromagnetic stirring plate blank

An electromagnetic stirring and quality technology, applied in the manufacture of converters, etc., can solve the problems of mold slag involvement defects, increase mold slag emulsification, and mold slag involvement, so as to reduce casting slab quality defects, improve hot rolling quality, Effect of improving slab quality

Active Publication Date: 2020-06-02
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method for improving hot rolling quality of electromagnetic stirring plate blank
  • Method for improving hot rolling quality of electromagnetic stirring plate blank
  • Method for improving hot rolling quality of electromagnetic stirring plate blank

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Embodiment Construction

[0037] For a batch of 300 tons of ladle, the converter stop blowing information is as follows: stop blowing free oxygen 691ppm, stop blowing carbon 400ppm, according to the converter slag volume 1500kg, the converter stop blowing slag composition is as follows:

[0038] Table 1 Converter slag composition (wt%)

[0039] CaOAl 2 O 3

MgO FeOSiO 2

MnO Impurities 46.82.18.120.012.63.9 margin

[0040] Note: During the production process, the total analysis components are less than 100, mainly uncontrollable components, such as loss on ignition and dust.

[0041] In the refining process, the oxygen removal in the molten steel is completed, and a part of the carbon in the molten steel is taken away. About 25% (100ppm) of the carbon in the molten steel is used to deoxidize the refractory materials and auxiliary materials of the molten steel, and the remaining about 75% ( 300ppm) decarburization with free oxygen in molten steel, the decarburization reaction formula is as follows (1), ...

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Abstract

The invention relates to a method for improving hot rolling quality of an electromagnetic stirring plate blank. The method comprises the following steps of (1) calculating the mass of existing aluminum oxide in steel slag, and recording the mass as m[Al2O3]<1>; calculating the mass m[Al2O3]<2>=m[O] x 102 / 48 of the generated aluminum oxide according to the free oxygen content m[O] of a decarburizedsteel ladle in the refining process; (2) controlling the weight ratio of CaO to Al2O3 to be 1.1-1.2 after refining treatment is completed, calculating the total weight m[Al2O3] needing to be reachedby Al2O3 after refining treatment according to a weight ratio range and the weight of CaO; and (3) calculating the total weight m[Al2O3]<3>:m[Al2O3]<3>=m[Al2O3]-m[Al2O3]<1>-m[Al2O3]<2> of Al2O3 needing to be supplemented after converter tapping is completed. According to the method, under the condition of preferentially ensuring the purity of molten steel, specific control scheme measures are given according to the main technical characteristics of the purity of the molten steel, and inclusions in steel are controlled from the source in the steelmaking process starting from the converter and refining; and on such basis, the purity of the molten steel is improved through optimizing a continuous casting electromagnetic stirring use mode.

Description

Technical field [0001] The invention belongs to the improvement field of steelmaking technical products, in particular improving the quality of continuous casting slabs, and in particular relates to a method for improving the hot rolling quality of electromagnetic stirring slabs. Background technique [0002] As far as 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 explaining how to realize electromagnetic stirring. However, for a certain type of electromagnetic stirring equipment on a fixed mold, and the corresponding refined molten steel, during the casting process, the mold level setting position is more suitable, that is, the electromagnetic stirring magnetic field strength is applied to the mold. , Especially the upper end of the crystallizer, from the current patents, few answers are given. For example, Patent Publication No. C...

Claims

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Application Information

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IPC IPC(8): C21C5/36C21C7/06C21C7/068B22D11/115B22D11/18
CPCC21C5/36C21C7/06C21C7/068B22D11/115B22D11/18
Inventor 赵显久周月明金小礼王华兵
Owner BAOSHAN IRON & STEEL CO LTD
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