Research development on mold metallurgy technologies during high speed slab continuous casting
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.
high casting speedslab continuous castingsubmerged nozzleoscillationmold fluxeven and intense coolingflow control by electromagnetic filedlevel fluctuation
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