中心偏析和等轴晶率是评价连铸坯内部质量的重要参数,而用于改善内部质量的电磁搅拌、微合金化等技术相对复杂,实施成本高。通过对结晶器插入钢带,通过钢带的熔化吸热有效地降低结晶器内钢液过热度,可以提高铸坯内部质量。讨论了在给定工艺条件下钢带插入对连铸坯质量的影响。计算和生产试验结果表明,插入钢带可以明显降低钢水过热度;插入钢带的连铸坯疏松和等轴晶率等指标均比没有插钢带的连铸坯好,且吨钢插入钢带量增加可以增加等轴晶率,有利于改善钢坯内部质量。
Abstract
Center segregation and equiaxial crystal ratio are the important parameters to evaluate the quality of continuous casting slab. And the technologies of improving internal quality,such as electromagnetic stirring and micro-alloying technology,are complex relatively and high cost during implementation. In this study,steel strip was fed into the continuous casting mold,resulting in a lower superheat of molten steel due to the absorption of heat. This study also discussed the effect of steel strip weight on the quality of slab.. The results of calculation and experiment show that,the liquid steel superheat can be obviously reduced by steel strip feeding. The internal quality(osteoporosis,equiaxial crystal ratio etc.)of continuous casting slab with strip feeding is better than the one without strip feeding. And when the weight of the strip increases,the equiaxial crystal ratio increases,too. And the technology of strip feeding is helpful to improve internal quality of billet.
关键词
连铸 /
插钢带 /
内部质量
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Key words
continuous casting /
feeding steel strip /
Internal quality
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中图分类号:
TF803.21
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参考文献
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[6] 李云涛, 张 立, 徐红伟. 钢带插入比对铸坯组织的影响[J], 世界钢铁,2011,(4): 27-30.
[7] 李宝宽, 李维彪,王芳,等. 结晶器插钢带技术及其模型化研究[C], 学术会议论文集,2006.
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脚注
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基金
国家国际合作专项项目
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