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Sliver defects in an ultra-low carbon Al-killed steel caused by low steel level in the tundish
Ironmaking & Steelmaking ( IF 2.1 ) Pub Date : 2020-11-29 , DOI: 10.1080/03019233.2020.1848306
Pablo B. P. Leão 1 , Jeferson L. Klug 1 , Hamilton F. G. de Abreu 1 , Carlos A. R. Carneiro 2 , Hilder C. Ferreira 2 , Wagner V. Bielefeldt 3
Affiliation  

ABSTRACT

Sliver defects were detected in galvanized and uncoated cold-rolled strips, and their causes were investigated. Most of these strips were produced from transition ladle slabs, which were obtained in a sequence of twenty heats of an ultra-low carbon Al-killed steel. A significant reduction in the steel level in tundish occurred during these slabs’ casting. The strip defects, and as a comparative, a mould flux inclusion found in a first slab of the sequence, were analysed with a scanning electron microscope (SEM). Also, each of the twenty heats was sampled in tundish, quenched in water, and manually analysed with SEM to characterize its dominant inclusions. Regarding the sliver defects, mainly silica together with alumina or Al–Ti–O systems particles were found in them. The primary sources for these particles are likely tundish flux and reoxidation products. Finally, a mechanism was proposed for the formation of these inclusions.



中文翻译:

中间包含钢量低引起的超低碳铝镇静钢条子缺陷

摘要

在镀锌和未涂层冷轧带钢中检测到条子缺陷,并对其原因进行了调查。大多数这些钢带是由过渡钢包板生产的,这些钢包板是通过连续二十炉次的超低碳铝镇静钢获得的。在这些板坯的铸造过程中,中间包中的钢含量显着降低。用扫描电子显微镜 (SEM) 分析带材缺陷,以及作为对比,在该序列的第一块板坯中发现的保护渣夹杂物。此外,二十炉中的每一炉都在中间包中取样,在水中淬火,并用 SEM 手动分析以表征其主要夹杂物。关于条子缺陷,主要是二氧化硅与氧化铝或 Al-Ti-O 系统颗粒一起被发现在其中。这些颗粒的主要来源可能是中间包焊剂和再氧化产物。最后,提出了形成这些夹杂物的机制。

更新日期:2020-11-29
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