Key Technologies of Macro Segregation Control in 320 mm×410 mm Continuous Casting Bloom for Railway Steel
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摘要: 为控制大断面生产重轨钢连铸坯碳偏析指数和中心偏析, 开展了电磁搅拌、提高轻压下总量、过热度与拉速匹配技术研究, 形成了攀钢320 mm×410 mm大方坯连铸重轨钢偏析控制关键技术。确定了该断面生产重轨钢的最佳连铸工艺参数为:结晶器电搅电流强度600 A、2.4 Hz, 凝固末端电搅电流强度330 A、7 Hz, 轻压下总压下量912 mm, 过热度控制在2035℃、拉速控制在0.700.72 m/min。生产的重轨钢连铸坯中心等轴晶率平均为41.2%, 连铸坯中心偏析≤0.5级的比例达到85%, 断面碳偏析指数控制在0.951.07, 连铸坯质量较好, 生产的钢轨质量满足标准要求。Abstract: The electromagnetic stirring,total amount of soft reduction and the matching between super heat and casting speed were researched in order to control carbon segregation index of transverse section and center segregation in rail steel bloom. The key technologies of segregation control in 320 mm×410 mm continuous casting bloom for railway steel had been established. The best parameters for continuous casting rail steel from this investigation are as follows: intensity and frequency of mold electromagnetic stir current are 600 A and 2.4 Hz,intensity and frequency of final electromagnetic stir current are 330 A and 7 Hz,total reduction of soft reduction is ranged from 9 mm to 12 mm,superheat is ranged from 20 ℃ to 35 ℃ and the casting speed is ranged from 0.70 m/min to 0.72 m/min. Based on these parameters,the resulted bloom has a high quality where the center equiaxial crystal is 41.2% on average,the rate of center segregation less than 0.5 is 85%,and the carbon segregation index of transverse section ranges from 0.95 ~1.07. The quality of bloom meets the standard requirements for rail production.
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Key words:
- rail steel /
- segregation /
- electromagnetic stirring /
- soft reduction /
- super heat /
- casting speed
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