板坯高拉速连铸结晶器冶金技术研究进展
Research development on mold metallurgy technologies during high speed slab continuous casting
兰鹏 1艾宏洲 1徐国栋 2王迎春 3于湛 4李权辉 4李明 4张立岗5
作者信息
- 1. 北京科技大学冶金与生态工程学院,北京 100083
- 2. 宝山钢铁股份有限公司炼钢厂,上海 201900
- 3. 宝山钢铁股份有限公司研究院,上海 201900
- 4. 南京钢铁股份有限公司,江苏 南京 210035
- 5. 昆明钢铁控股有限公司,云南 昆明 650302
- 折叠
摘要
高拉速是板坯连铸领域的研究热点,对连铸装备设计、生产工艺、产品质量、成本控制、节能降耗等均有直接影响.对比来看,中国常规板坯连铸高拉速指标和国外仍有一定的差距,但一些企业率先完成了拉速高于1.8 m/min的探索,部分铸机已达到甚至超过了2.0 m/min先进水平.板坯高拉速连铸是一项系统工程,需要相关的配套技术才能实现高效、安全、稳定的生产,如浸入式水口结构和工艺参数、结晶器振动、保护渣、结晶器冷却、电磁控流、液位波动补偿等工作都有必要进行针对性的设计和优化.大量研究表明,结晶器内钢水的稳定流动和传热与坯壳均匀生长及其良好润滑是影响板坯高拉速连铸顺行和产品质量的关键因素.目前的技术水平下,板坯高拉速连铸主要集中在低碳钢和过包晶钢的生产中,而亚包晶钢和高碳钢的拉速虽有提高,但仍与前者有一定差距.高拉速连铸因钢种、坯型、设备、操作和技术水平的差异而具有不同的定义,不同时代的高拉速水平也大有不同.高拉速结晶器冶金技术是板坯高效连铸的核心保障,相关内容和结论可为业内学者和技术人员开展高拉速连铸工作提供理论和技术参考.
Abstract
High casting speed is the hot research topic in the field of slab continuous casting with the direct effect on equipment design,manufacturing processes,product quality,cost control and energy saving and consumption reduc-ing.In comparison to the level of high casting speed in abroad,the technical index in domestic plants is still behind.However,some researchers succeeded in exploring high speed slab continuous casting and improved the casting speed to higher than 1.5 m/min,even over 2.0 m/min ranking as the advanced level.High speed slab continuous casting is actually a systematical engineering,with great demand on the supporting technologies to make it run at high efficiency,high safety and high stability.The tailored design and optimization should be carried out including submerged nozzle structure parameters,mold oscillation,mold flux,mold cooling,flow control by electromagnetic field and level fluctuation compensation.The results in previous studies show that the key factors influencing the product quality and safety and stability in high speed continuous casting are the steady flow and heat transfer of liquid steel in the mold,together with the even growth and good lubrication of the shell.Low carbon steel and hyper-peritectic steel are preferentially employed in the trial of high speed continuous casting,and the casting speed of hypo-peritectic steel and high carbon steel is still falling behind,although it increases obviously.The definition of high speed continuous casting is different with the variation of steel grade,strand type,equipments,operation,and technology,and the level of high casting speed is also different in different era.High speed mold metallurgy tech-nologies are the core guarantee for high efficiency slab continuous casting.It is expected that the contents and conclu-sions of the study can be the theoretical and technological references for the experts and researchers regarding the issue of high speed continuous casting.
关键词
高拉速/板坯连铸/水口/振动/保护渣/均衡强冷/电磁控流/液位波动Key words
high casting speed/slab continuous casting/submerged nozzle/oscillation/mold flux/even and intense cooling/flow control by electromagnetic filed/level fluctuation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据