针对帘线钢夹杂物控制,通常选择长时间软吹处理提高钢水洁净度,但会导致镁碳砖侵蚀加剧.通过工业生产试验,使用FEI Explorer 4自动扫描电镜,研究LF精炼结束后软吹时间对帘线钢盘条夹杂物成分、数量的影响;并采用贝卡标准评分和神户标准Max-T(ave)评分进行盘条夹杂物评价.结果表明,LF精炼结束后软吹时间45 min与软吹时间25 min生产工艺对比,盘条中尺寸大于3 μm的氧化物夹杂成分基本类似,夹杂物密度分别为135个/100 mm2、103个/100 mm2,LF精炼结束后软吹时间25 min工艺夹杂物数量密度略低.扩大对比试验数量,盘条贝卡标准评分和神户标准Max-T(ave)评分表明,LF精炼结束后软吹时间20～25 min的夹杂物控制并未变差或略有改善趋势.帘线钢中低熔点夹杂物的控制主要通过控制Al含量、精炼渣等工艺参数,而导致最终产品失效的夹杂物往往与内生夹杂物类型不一致,对于帘线钢而言,可以考虑降低LF精炼结束后软吹时间.
Effect of LF Soft Bubbling Time on Inclusions in Tire Cord Steel LX82 A
For the control of cord steel inclusion,long time soft bubbling treatment is usually chosen to improve the clean-liness of molten steel,but it will lead to the increased erosion of magnesia-carbon bricks.Through the industrial produc-tion test,the effects of soft blowing time after LF refining on the composition and quantity of oxide inclusions of cord steel wire rod were studied by means of FEI Explorer 4 automatic scanning electron microscopy.Becca standard score and Kobe Standard Max-T(ave)score were used to evaluate the inclusion of wire rod.The results showed that the composition of ox-ide inclusions larger than 3 μm in the wire rod was similar to that in the process of soft blowing time of 45 min and 25 min after LF refining,and the density of inclusions was 135/100 mm2 and 103/100 mm2,respectively.The density of inclu-sions in the process of soft blowing time of 25 min after LF refining was slightly lower.Expanding the number of compari-son tests,the score of Kobe standard Max-T(ave)and Becca standard indicate that the inclusions control of soft bubbling process for 20-25 min did not become worse or slightly improved.The control of low melting point inclusions in cord steel was mainly through controlling Al content,refining slag and other process parameters,and the inclusions that lead to the failure of the final product are often inconsistent with the types of endogenous inclusions.For cord steel,it can be consid-ered to reduce the soft blowing time after LF refining.
万方数据
维普
