小方坯连铸6.0 m/min高拉速技术改善与生产实践  

Technical improvement and production practice of 6.0 m/min high casting speed for billet continuous casting

作　　者：郑原首 谢长川 马桂华 李富帅 林真 钱亮 ZHENG Yuanshou;XIE Changchuan;MA Guihua;LI Fushuai;LIN Zhen;QIAN Liang(Steelmaking Plant,Fujian Sangang Minguang Co.,Ltd.,Sanming 365000,Fujian,China;CCTEC Engineering Co.,Ltd.,Wuhan 430073,Hubei,China)

机构地区：[1]福建三钢闽光股份有限公司炼钢厂,福建三明365000 [2]中冶南方连铸技术工程有限责任公司,湖北武汉430073

出　　处：《连铸》2023年第4期61-67,共7页Continuous Casting

摘　　要：高拉速是小方坯连铸机螺纹钢实现低成本且绿色化生产的必要条件,是连铸整体技术进步的体现。福建三钢二炼钢3号小方坯连铸机经高效化改造,160 mm×160 mm断面螺纹钢拉速达到6.0 m/min的能力,生产过程拉速提高到4.1 m/min时发生漏钢以及铸坯拉断事故。综合采用调研及追溯等手段分析引起漏钢事故的机理及影响因素,发现结晶器振动工艺、浸入式水口插入深度及保护渣性能参数是引起漏钢的主要因素,从机理和模型角度研究了3个因素对漏钢定性和定量化影响规律。结果表明,在结晶器均匀强冷已实现条件下结晶器润滑状态对高拉速的稳定生产有决定性影响,合适的振动工艺是其限制性因素。采用优化后的结晶器振动工艺(脱模平均速率大于20 mm/s)、保护渣(碱度0.9、熔点1 020℃、黏度0.23 Pa·s)以及浸入式水口插入深度(120 mm),160 mm×160 mm断面小方坯螺纹钢拉速从4.1 m/min最终提高到6 m/min且未发生漏钢事故。High casting speed is the necessary condition for realizing low-cost and green production of deformed steel bars in billet caster,and it is the embodiment of the overall technological progress of continuous casting.After the billet caster of Fujian Sangang steelmaking plant has been transformed with high efficiency,casting speed with 160 mm×160 mm section deformed steel has the ability to reach 6.0 m/min.When screw thread steel with 160 mm×160 mm section billet is increased to 4.1 m/min in the production process,steel leakage and billet breaking accidents occur.Through comprehensive analysis of the mechanism and influencing factors of breakout accidents by means of investigation and tracing,it was found that mold vibration process,immersion nozzle insertion depth and mold powder performance parameters were the main factors causing breakout,and the qualitative and quantitative influence rules of three factors on breakout were studied from the perspective of mechanism and model.The results show that the lubrication state of the mold has a decisive influence on the stable production of high casting speed under the condition of uniform and strong cooling of the mold,and the appropriate vibration process is the limiting factor.After technical measures of the optimized mold vibration process(the average demoulding rate is greater than 20 mm/s),immersion insertion depth(120 mm)and mold powder are adopted(alkalinity 0.9,melting point 1020℃,viscosity 0.23 Pa·s),casting speed of screw thread steel with 160 mm×160 mm section billet is finally increased from 4.1 m/min to 6 m/min,and no breakout occurred.

关 键 词：小方坯 螺纹钢 高拉速 漏钢 润滑状态 

分 类 号：TF777.3[冶金工程—钢铁冶金]