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唐钢薄板坯连铸连轧线在2012年围绕提高连铸拉速对薄板坯连铸机进行工艺技术优化,优化后连铸工作拉速由原来的4 m/min以下提高到4.5~5.5 m/min,最高拉速可以达到6.0 m/min。为解决连铸拉速提高后铸坯质量缺陷增加的问题,对高拉速保护渣、浸入式水口、结晶器冷却方式和结晶器窄板进行技术优化研究。通过优化,连铸坯的裂纹缺陷率降至0.1%以下,表面夹渣缺陷率不高于0.03%,结晶器铜板寿命显著延长,漏钢率不高于0.1%,实现了高拉速下薄板坯连铸的稳定生产。
In 2012, the technology of thin slab continuous casting and rolling line in Tangshan Steelmaking Co., Ltd. was optimized around the continuous casting speed. After optimization, the pulling speed of continuous casting was increased from below 4 m / min to 4.5-5.5 m / min, the maximum pulling speed can reach 6.0 m / min. In order to solve the problem of the increase of the slab quality defects after the continuous casting speed is increased, the technical optimization research on high-speed mold powder, immersed nozzle, mold cooling method and mold narrow plate is carried out. Through the optimization, the slab crack defect rate dropped to below 0.1%, the surface of the slag rejection rate of not more than 0.03%, significantly prolonging the life of the mold copper, steel leakage rate of not more than 0.1%, to achieve a high pull rate sheet Billet continuous casting stable production.