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Method for reducing Q195-BG steel continuous casting bonding steel leakage

A Q195-BG, continuous casting technology, applied in the field of metallurgy, can solve the problems of no Q195-BG steel breakout treatment method, continuous casting production antegrade impact, etc., achieve significant economic benefits, ensure stable rectification, and reduce equipment losses Effect

Inactive Publication Date: 2020-10-16
PANGANG GRP PANZHIHUA STEEL & VANADIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The annual average loss of equipment and quality caused by frequent steel breakout accidents is more than 1.2 million yuan, and at the same time, it has caused a serious impact on the continuous casting production
At present, there is no solution to the problem of steel breakout of Q195-BG steel

Method used

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Examples

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preparation example Construction

[0019] The preparation method of the Q195-BG steel in the invention comprises: hot metal desulfurization-converter steelmaking-LF furnace refining-continuous casting.

[0020] Desulfurization of molten iron can be done by well-known desulfurization methods in the industry. When the S content in molten iron is reduced to below 0.020%, converter steelmaking is carried out. In the converter steelmaking stage, considering the process increase [C] in the LF furnace refining stage and continuous casting stage, the content of [C] at the end of the converter is controlled to 0.04% ~ 0.06%; in the LF furnace refining stage, considering the increase [C] in the continuous casting stage C], control the [C] content of the LF furnace refined outbound molten steel at 0.04% to 0.07%, so as to ensure that the [C] content of the continuous casting product meets 0.04% to 0.08%.

[0021] In the present invention, the [C] content of the continuous casting finished product of Q195-BG steel is set t...

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PUM

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Abstract

The invention belongs to the technical field of metallurgy, and specifically relates to a method for reducing Q195-BG steel continuous casting bonding steel leakage. For the problem of frequent occurrence of bonding steel leakage accidents and high bleeding out rate in the continuous casting production of Q195-BG steel, the invention provides the method for reducing the Q195-BG steel continuous casting bonding steel leakage. The method comprises the following steps of step a, in a converter smelting stage, controlling the content of a converter end point [C] to be 0.04% to 0.06%; in an LF furnace refining stage, controlling the LF furnace refining outbound molten steel [C] content to be 0.04% to 0.07%; step b, in a continuous casting stage, controlling the specific water flow of continuouscasting secondary cooling water to be 0.96L / Kg to 1.04L / Kg; and step c, in the continuous casting stage, controlling the basicity of a mold flux to be 0.86 to 1,00. According to the method for reducing the Q195-BG steel continuous casting bonding steel leakage provided by the invention, by comprehensively controlling the content of the finished steel product [C], the specific water flow of the continuous casting secondary cooling water and the basicity of the mold flux, the bleeding out rate is greatly reduced, the stable and smooth continuous casting production is ensured, and the method hasgood economic benefits.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for reducing Q195-BG steel continuous casting bonding breakout. Background technique [0002] In order to meet the market demand for large spangle galvanized sheets and color-coated sheets for low-cost construction, Panzhihua Iron and Steel developed the low-cost construction steel Q195-BG in 2017. Q195-BG is a common carbon steel, and the [C] content in its composition design is 0.04% to 0.10%. [0003] In the continuous casting production process of Q195-BG steel, bonded breakout accidents occurred frequently. From May 2017 to May 2019, 3574 furnaces were produced, and a total of 6 bonded breakouts occurred, and the breakout rate was as high as 1.7‰ , much higher than the breakout rate of less than 0.3‰ in continuous casting production. The annual average loss of equipment and quality caused by frequent steel breakout accidents is more than 1.2 million...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04B22D11/111B22D11/22C21C5/28
CPCB22D11/111B22D11/225C21C5/28C22C38/02C22C38/04
Inventor 周明佳黎建全何天科
Owner PANGANG GRP PANZHIHUA STEEL & VANADIUM