Abstract: The effectiveness of development and application of quality control integration technology for concasting 260 mm x300 mm bloom of alloy steels produced with 50 t EAF-LF(VD)-CC flow sheet at Laiwu Steel is briefly presented. The quality of concasting bloom is improved by development of process control technologies including suitable bloom cleanliness and protection casting, secondary cooling equipment design for dynamic control of secondary cooling, precision parameters integration optimization, and on-line prediction and qualification system for bloom quality with hot charging process. The examination qualified rate of pickled macrostructure of rolled steel products increases from 97. 50% in 2007 to 99. 01% in 2009, the qualified rate of bloom is more than 99.92% , the yield of products increases from original 96. 50% to 96. 80% , and the hot charging rate raises from 45% to 75%.

Key words: 260 mm x 300 mm Concasting Bloom, Alloy Steel, 50 t EAF-LF ( VD)-CC Flow Sheet, Quality Control, Integration Technology

摘要： 简述了莱钢50 t EAF-LF(VD)-CC流程中合金钢260 mm×300 mm连铸坯质量控制集成技术的开发和应用效果。通过合理的铸坯纯净度和全程保护浇铸,二冷动态控制的二冷工艺设备设计,工艺设备精度参数群优化,热装工艺的铸坯质量在线预报判定系统等控制技术的开发,提高了铸坯质量,钢材酸浸低倍检验合格率由2007年的97.50%提高到2009年的99.01%,铸坯合格率在99.92%以上,成材率由原来的96.50%提高到96.80%,铸坯热装率由45%提高到75%。

关键词: 260mm×300mm连铸坯, 合金钢, 50t EAF-LF(VD)-CC流程, 质量控制, 集成技术