摘要:
简述了攀钢自主开发的360 mm×450 mm大方坯连铸集成技术及其效果。通过研究开发合理的连铸二冷技术、凝固末端动态轻压下技术和结晶器电磁搅拌技术,提高了铸坯内部质量,解决了大方坯中心疏松、中心偏析、内部裂纹等内部缺陷较严重的技术难题;通过研究设计合理的结晶器结构和冷却工艺制度,以及开发性能优良的连铸保护渣,提高了铸坯表面质量,减轻了大方坯表面凹槽和凹坑缺陷。两年多的生产实践表明,攀钢360 mm×450 mm大方坯连铸机生产的铸坯,中心疏松、偏析、缩孔、裂纹等内部缺陷的评判级别均小于1.0级的综合比例达到99.03%,中心碳偏析指数为1.01~1.05(平均1.03),铸坯表面无缺陷率平均达到99.54%。研究成果为促进攀钢品种结构调整和开发高质量、高性能、高附加值产品提供了重要的技术支撑。
Abstract:
The integrated technologies for 360 mm×450 mm bloom caster and its application results at PISCO (Panzhihua Iron & Steel Co.) were presented.The internal defects of continuous casting bloom such as center looseness, central segregation and center line cracks, were greatly reduced by optimizing secondary cooling scheme, mold electromagnetic stirring (M-EMS) and dynamic soft reduction process.The surface depression defect was remarkably decreased by designing proper mold structure, cooling scheme and mold flux.The production practice in the past two years showed that the rate of central looseness, segregation, shrinkage and crack ratings lower 1.0 was up to 99.03%, the center segregation index of carbon was in the range from 1.01 to 1.05 (mean value of 1.03), and the surface defect-free rate of bloom was up to 99.54%.These achievements have provided PISCO important technology supports to optimize the steel product structure, and to develop the high quality, property, and value added products.
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