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轻压下对82B钢矩形坯内部质量的影响

  

  1. (1.北京科技大学 钢铁冶金新技术国家重点实验室,北京 100083;2.青岛钢铁集团有限公司 技术中心,山东 青岛 266043)
  • 接受日期:1900-01-01 出版日期:2015-08-05

Effect of soft reduction on inner quality of 82B steel rectangular bloom

  • Accepted:1900-01-01 Online:2015-08-05

摘要: 为确定矩形断面180 mm×240 mm高碳钢82B连铸坯轻压下的压下位置,利用有限元软件ProCAST建立了连铸坯凝固传热模型。在不同拉速和比水量下,利用射钉和红外测温验证了模型的准确性。工业试验结果表明,轻压下连铸坯中心疏松和缩孔都得到了明显改善,中心疏松1级比例由55 %提高到77 %,缩孔评级不大于0.5级比例由45 %提高到90 %;轻压下显著改善铸坯V形偏析;铸坯中心平均碳偏析指数由1.17降到1.07,最大碳偏析指数由1.27降到1.15。

关键词: 轻压下, 高碳钢矩形坯, 中心偏析, 中心疏松, 缩孔

Abstract: To determine the soft reduction zone in 82B steel continuouscasting bloom with section size of 180 mm×240 mm, a mathematical heat transfer model was developed based on the finite element commercial software ProCAST. The adequacy of the model was compared with pinshooting results and surface temperature measurement. The results showed that the grade of center porosity equals to 1.0 was increased from 55 % to 77 %and the percentage of shrinkage cavity less than level 0.5 was increased from 45 % to 90 % with the soft reduction. Besides, soft reduction process was used successfully for suppressing Vsegregation. The mean center carbon segregation index was reduced from 1.17 to 1.07 and the maximum center carbon segregation index decreases from 1.27to 1.15.

Key words: soft reduction, high carbon steel rectangular bloom, center segregation, center porosity, shrinkage cavity