Dynamic Soft Reduction Technology for 360mm×450mm Bloom Caster
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摘要: 简述了攀钢自主开发的360 mm×450 mm大方坯连铸动态轻压下控制技术及其应用效果。通过开展轻压下工艺对大方坯内部质量影响的试验研究，掌握了轻压下工艺与铸坯中心疏松、中心偏析等的关系。试验表明，采用轻压下工艺，45CrMnMo合金钢铸坯中心疏松≤1.0级的比例由66.67%增至85.71%，中心偏析≤1.0级的比例由94.44%增至100%，无中心缩孔的比例由88.89%增至96.42%，中心碳偏析指数由1.04~1.19（平均1.15）降为1.02~1.09（平均1.05）。研究结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 dynamic soft reduction technology for 360 mm×450 mm bloom caster and its application results at PISCO (Panzhihua Iron & Steel Co.) were presented.Experiment for contrasting process with or without soft reduction for bloom was investigated, in order to analyze the influence of the soft reduction on internal quality of bloom, such as center looseness and central segregation.The operation shows that after applying the soft reduction to bloom of alloy steel, the ratio of center looseness which is ≤ 1.0 increases from 66.67% to 85.71%, central segregation which is ≤ 1.0 is increases from 94.44% to 100%, central shrinkage cavity which is free increases from 88.89% to 96.42%, and central segregation index of carbon decreases from mean value of 1.15 to 1.05.These results have provided important technology supports for PISCO to optimize the steel product structure, and to improve the production of high quality, property, and value added products.
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