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针对BOF→RH→CSP工艺生产含钛IF钢浸入式水口结瘤问题,采用扫描电镜、能谱分析等方法,分析了IF钢浇铸过程水口结瘤物的组成,结合中间包夹杂物的特性,阐明了水口结瘤的机理。结果表明:钛元素的存在一方面使钢水中Al_2O_3夹杂物不易碰撞长大,另一方面减小了钢液、耐材和夹杂物之间的润湿角,容易造成水口结瘤;结瘤物初始沉积层主要为钢水与水口耐材反应生成的以Al_2O_3为主的复合氧化物;而结瘤物主体层主要来源于钢水中的夹杂物,为低变性的MgO·Al_2O_3尖晶石或Al_2O_3,且含有钢滴;夹杂物沉积进而烧结成疏松的网状层,使钢水更易粘附从而加剧了水口结瘤速度。研究结果可为优化工艺参数、提高BOF→RH→CSP工艺连浇炉数和产品质量提供可靠的理论指导。
According to the BOF → RH → CSP process, the problem of nodule formation in immersion nozzle of titanium-containing IF steel was analyzed. The composition of nozzle nodules in the casting process of IF steel was analyzed by scanning electron microscope and energy spectrum analysis. Combined with the characteristics of tundish inclusions, Clarified the mechanism of nozzle nodulation. The results show that the presence of titanium element makes Al 2 O 3 inclusions in molten steel less likely to collide and grow, and on the other hand, the wetting angle between molten steel, refractory material and inclusions is reduced, The initial sedimentary layer is mainly composed of Al 2 O 3 -based composite oxide formed by refractory reaction of molten steel and nozzle, while the nodule main layer is mainly derived from inclusions in molten steel, which is low denatured MgO · Al 2 O 3 spinel or Al 2 O 3, And contains steel droplets; inclusions deposited and then sintered into a loose mesh layer, so that more easy to adhere to the molten steel to exacerbate the nozzle nodulation speed. The research results can provide reliable theoretical guidance for optimizing the process parameters, increasing the number of BOF → RH → CSP process pouring furnaces and product quality.