IF钢铸坯表层大型夹杂物分布及来源研究

炼钢 ›› 2016, Vol. 32 ›› Issue (4): 73-80.

• 特殊钢中夹杂物控制 • 上一篇

IF钢铸坯表层大型夹杂物分布及来源研究

（1.重庆大学材料科学与工程学院，重庆 400045；2.上海宝钢集团有限公司，上海 201900）

接受日期:1900-01-01 出版日期:2016-08-05

Study on distribution and source of large inclusions in the surface layer of IF steel slab

Accepted:1900-01-01 Online:2016-08-05

摘要/Abstract

摘要： 针对IF钢铸坯表层大型夹杂物问题，通过大样电解法研究了电磁制动、拉速对IF钢铸坯表层大型夹杂物数量及分布的影响，结合扫描电镜、数值模拟等方法讨论了大颗粒夹杂物的类型和来源。结果表明：未开电磁制动时，夹杂物在铸坯边部有聚集现象。拉速提高铸坯边部夹杂物聚集减弱，1.5m/min拉速较1.2 m/min低拉速减弱17 %，夹杂物总量也降低了5.3 %；1.2 m/min拉速开电磁制动，夹杂物平均数量减少52.0 %，铸坯宽度方向夹杂物分布趋于均匀。SiO2系复合夹杂物因表面张力小是IF钢中主要的大型夹杂物类型，其次有MgO系、Al2O3系、TiO2系复合夹杂物；耐火材料的冲刷侵蚀、二次氧化、水口结瘤物是铸坯中大型夹杂物的来源。

关键词: IF钢, 大型夹杂物, 类型, 来源, 分布

Abstract: Aiming at the problem of large inclusions in the surface of IF steel slab, the influence of electromagnetic braking and casting speed on the amount and distribution of these inclusions was studied by slims method. Besides, the type and source of large inclusions were also discussed by scanning electron microscopy and numerical simulation. The results showed that large inclusions could accumulate in the edge of slab when the electromagnetic braking was kept off. And the accumulation of large inclusions would be weakened with the increase of casting speed. The degree of this accumulation was decreased by 17 % and amount of inclusions was also reduced by 5.3 % with the casting speed increased from 1.2 m/min to 1.5 m/min. The amount of inclusions decreased by 52% with a homogeneous distribution when the electromagnetic braking was kept on in the condition of 1.2 m/min. Due to low surface tension, the SiO2based complex inclusions was the main inclusion type of IF steel, and MgObased, Al2O3based, TiO2based were also found in IF steel. Meanwhile, refractory corrosion, reoxidation oxide and nozzle clogs were the main source for the large inclusions.

Key words: IF steel, large inclusions, composition, source, distribution

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IF钢铸坯表层大型夹杂物分布及来源研究

Study on distribution and source of large inclusions in the surface layer of IF steel slab

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