| 板坯氢含量控制和中心碳偏析改善研究 |
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| 引用本文： | 朱志远,宁林新,王国连. 板坯氢含量控制和中心碳偏析改善研究[J]. 钢铁, 2006, 41(10): 32-34,38 |
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| 作者姓名： | 朱志远 宁林新 王国连 |
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| 作者单位： | 首钢集团技术研究院,北京,100041;首钢集团第二炼钢厂,北京,100041 |
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| 摘 要： | 调查了首钢炼钢生产流程中的氢含量变化规律和铸坯碳偏析情况,研究表明LF处理工序是钢水增氢的主要位置.在板坯中碳的偏析同时存在负偏析区和中心正偏析.利用简化的一维非稳态扩散菲克第二定律传质方程,建立了12块板坯堆垛中各板坯内部的元素扩散模型,实际测量了不同时间下板坯堆垛内各板坯的温度变化规律,并将得到的温度测定结果应用于模型中,从而计算得到元素扩散的变化规律.根据氢和碳的元素扩散规律,可知板坯堆冷工艺可以促使氢的扩散,但对中心碳偏析影响不大.通过提高加热炉的加热温度和时间,板坯中心偏析将得到很大程度的改善.
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| 关 键 词： | 连铸 板坯 氢扩散 |
| 文章编号： | 0449-749X（2006）10-0032-04 |
| 修稿时间： | 2006-01-04 |
Hydrogen Content Control and Improvement of Central Carbon Segregation of Slab |
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| ZHU Zhi-yuan,NING Lin-xin,WANG Guo-lian. Hydrogen Content Control and Improvement of Central Carbon Segregation of Slab[J]. Iron & Steel, 2006, 41(10): 32-34,38 |
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| Authors: | ZHU Zhi-yuan NING Lin-xin WANG Guo-lian |
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| Affiliation: | 1. Research Institute of Technology, Shougang Group, Beijing 100041, China; 2. No. 2 Steelmaking Plant, Shougang Group, Beijing 100041, China |
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| Abstract: | The change of hydrogen content during steelmaking process was investigated firstly. It was found that hydrogen content in liquid steel is rapidly increased in LF process. In the slab, the negative carbon segregation region and positive segregation in the center are observed simultaneously. By using simplified diffusion equation, the element diffusion model was built for 12-slab stack cooling process. The surface temperature of each slab was measured at different stack cooling time. Applying the measured temperature to the model, carbon and hydrogen diffusion results were calculated. Using these results, it can be concluded that slab stack cooling can promote the diffusion of hydrogen, but weakly affect central carbon segregation. Increasing the temperature and holding time of reheating, central carbon segregation can be improved a great deal. |
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| Keywords: | continuous casting slab hydrogen diffusion |
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