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

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 quality defects, improve hot rolling quality, Effect of improving slab quality

Active Publication Date: 2022-03-18
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
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  • 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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  • A Method for Improving the Quality of Electromagnetically Stirred Slab Hot Rolling
  • A Method for Improving the Quality of Electromagnetically Stirred Slab Hot Rolling
  • A Method for Improving the Quality of Electromagnetically Stirred Slab Hot Rolling

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Embodiment Construction

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

[0038] Table 1 Composition of converter blowing slag (weight %)

[0039] CaO al 2 o 3

MgO FeO SiO 2

MnO Impurities 46.8 2.1 8.1 20.0 12.6 3.9 margin

[0040] Note: During the production process, the total number of analyzed components is less than 100, mainly including uncontrollable components, such as loss on ignition and dust.

[0041] In the refining process, the removal of oxygen in the molten steel is completed, and a part is taken away by the stop-blowing carbon in the molten steel. About 25% (100ppm) of the stop-blowing carbon is used for deoxidation of the refractory and auxiliary materials in the molten steel, and the remaining about 75% ( 300ppm) and fr...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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