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Smelting method of high-grade silicon steel

A smelting method and high-grade technology, applied in the field of iron and steel metallurgy manufacturing, can solve the problems of short RH treatment cycle and low productivity, and achieve the effects of shortening the decarburization time, reducing the addition of alloys, and promoting decarburization.

Pending Publication Date: 2022-06-28
ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a method for smelting high-grade silicon steel, which efficiently controls the contents of S, C, and T.O in molten steel at extremely low levels, and has a short RH treatment cycle, which solves the problem of prolonging the smelting process for desulfurization and decarburization in the prior art. Cycle time, low productivity issues

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  • Smelting method of high-grade silicon steel
  • Smelting method of high-grade silicon steel
  • Smelting method of high-grade silicon steel

Examples

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Effect test

Embodiment 1

[0095] Embodiment 1 of the present invention provides a smelting method for high-grade silicon steel. The chemical composition of the silicon steel includes: Si: 2.0%, Al: 1.5%, Mn: 0.3%, P: 0.030%, C: 0.0011 %, S: 0.0020%, and Fe and other trace elements, including the following steps:

[0096] KR molten iron pretreatment: Before the blast furnace tapping, clean the ladle mouth, ladle wall and ladle bottom without obvious slagging. The ladle used is 3 times ladle; add desulfurizer to the ladle during blast furnace tapping , After the iron receiving is completed, the iron ladle is transported to the KR station. Before the KR desulfurization, the scum on the surface of the molten iron is removed, and the desulfurization agent is added for deep desulfurization treatment. slag until there is no obvious scum on the surface of molten iron; after KR molten iron pretreatment, Si content: 0.20%, C content: 4.0%, S content: 0.0010%, temperature: 1370 ℃.

[0097] Converter smelting: th...

Embodiment 2

[0107] The second embodiment of the present invention provides a method for smelting high-grade silicon steel. The chemical composition of the silicon steel, in terms of mass percentage, includes: Si: 3.5%, Al: 0.6%, Mn: 0.7%, P: 0.015%, C: 0.0013 %, S: 0.0015%, and Fe and other trace elements, including the following steps:

[0108] KR molten iron pretreatment: Before the blast furnace tapping, clean the ladle mouth, ladle wall and ladle bottom without obvious slagging. The ladle used is 25 times ladle; add desulfurizer to the ladle during blast furnace tapping , After the iron receiving is completed, the iron ladle is transported to the KR station. Before the KR desulfurization, the scum on the molten iron surface is removed, and the desulfurization agent is added for deep desulfurization treatment. slag until there is no obvious scum on the surface of molten iron; after KR molten iron pretreatment, Si content: 0.50%, C content: 4.0%, S content: 0.0008%, temperature: 1398 ℃....

Embodiment 3

[0119] The third embodiment of the present invention provides a method for smelting high-grade silicon steel. The chemical composition of the silicon steel, in terms of mass percentage, includes: Si: 2.5%, Al: 1.0%, Mn: 0.5%, P: 0.02%, C: 0.0011 %, S: 0.0021%, and Fe and other trace elements, including the following steps:

[0120] KR molten iron pretreatment: before the blast furnace tapping, remove all the slag in the ladle mouth, ladle wall, and ladle bottom, and the ladle used is 3 times ladle; when the blast furnace is tapping, add desulfurizer to the ladle, and the iron connection is completed. Then, the iron ladle is transported to the KR station. Before KR desulfurization, the scum on the surface of molten iron is removed, and desulfurization agent is added to carry out deep desulfurization treatment. After the treatment, the molten iron Si content: 0.20%, C content: 4.0%, S content: 0.0010%, temperature: 1370°C.

[0121] Converter smelting: scrap steel in the convert...

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Abstract

The invention provides a smelting method of high-grade silicon steel, which comprises the following steps of: before blast-furnace tapping, keeping no slag bonding in an iron ladle, adopting the iron ladle for 3-25 times, adding a desulfurizing agent into the iron ladle for pre-desulfurization during blast-furnace tapping, and then performing KR desulfurization and secondary slagging in a converter for dephosphorization and sulfur control respectively, so that the final sulfur content of the converter is reduced to be below the target sulfur content. Removing steel ladle slag after tapping of the converter, adding synthetic slag, calculating the weight of molten steel, calculating the addition amount of each alloy, and then transporting the steel ladle to an RH (Ruhrstahl Heraeus) station; before the steel ladle is jacked, closing a vacuum main valve, sequentially opening a first-stage water circulating pump and a second-stage water circulating pump, simultaneously starting to jack the steel ladle, adjusting the current of the water circulating pumps to enable the pressure of one side of a vacuum system pipeline to be 300-450 mbar when the steel ladle reaches a treatment station, opening the vacuum main valve, starting to vacuumize and decarburize, and after the decarburization is finished, adding an alloy to deoxidize and alloy, and then carrying out clean circulation, and breaking and tapping. According to the method, the RH desulfurization step is omitted, RH decarburization is accelerated, the one-time hit rate of the alloy is increased, and the efficiency and the molten steel cleanliness are improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy manufacturing, in particular to a smelting method for high-grade silicon steel. Background technique [0002] With the rapid development of high-end electrical appliance manufacturing industry, in recent years, led by low-carbon environmental protection, industries such as new energy vehicles, low-energy home appliances, and intelligent robots have an increasing demand for high-grade non-oriented silicon steel. The control of C, S, T.O content and the cleanliness requirements of molten steel are becoming more and more strict. [0003] In order to control the content of C and S up to the standard, the alloy with ultra-low C and S content should be selected first to avoid the increase of C and S in the molten steel due to a large amount of alloys during alloying. at extremely low levels. In order to ensure that the C content of the molten steel is controlled at a very low level i...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/06C21C1/02C21C5/28C21C7/00C21C7/06C21C7/064C21C7/068C21C7/10
CPCC22C33/06C22C38/02C22C38/04C22C38/06C22C38/004C21C7/064C21C1/02C21C5/28C21C7/10C21C7/068C21C7/06C21C7/0006Y02P10/20
Inventor 赵家七蔡小锋马建超皇祝平张连兵
Owner ZHANGJIAGANG YANGTZE RIVER COLD ROLLED PLATE CO LTD
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