摘要:
针对某厂生产超低碳钢时夹杂缺陷较多的问题,通过优化改质剂成分、控制RH进站温度、调整加Al脱氧和合金化时间间隔、优化保护渣成分等针对性措施,取得了较理想的效果。研究发现通过调整小粒石灰和铝渣的配比,全铁含量由改质前的29.5%降至10.9%,下降幅度为63%;合理的钢水进站温度可以最直接地减少RH吹氧产生的夹杂;RH冶炼中Al、Ti无时间间隔加入时,钢液中会产生大量的Al-Ti复合夹杂,造成水口堵塞,加Al时间与加Ti合金时间间隔在150 s以上,可以有效降低水口堵塞的比例;最终冷轧夹杂缺陷的比例由0.33%降至0.15%。
关键词:
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超低碳钢 /
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顶渣改质 /
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夹杂物 /
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汽车板
Abstract:
In order to solve the problem of large amount of inclusions in ultra-low carbon steel,these measurement such as optimizing the modifier composition,controlling the temperature of RH inlet temperature,adjusting the time interval between adding Al to deoxidize and alloying,and optimizing composition of the slag had been utilized.It was found out that by adjusting the ratio of small particles of lime and aluminum slag,total iron content decreased from 29.5% to 10.9% after the modification.At a reasonable temperature of inlet molten steel the inclusion due to the blowing oxygen during RH process can directly reduced.In RH smelting,when Al and Ti are added without time interval,a large amount of Al-Ti composite inclusions will generate in the molten steel,which will lead to the blockage of the nozzle. Controlling the interval time between adding Al and add Ti alloy more than 150 s can effectively reduce the frequency of nozzle clogging.The percentage of cold rolling inclusion defects had been decreased from 0.33% to 0.15%.
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