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连铸生产高强钢时,如高铝相变诱发塑性钢(简称TRIP钢),传统的硅钙保护渣由于SiO2的急剧减少而表现出了固有的不稳定性。保护渣中二氧化硅的减少导致氧化铝增加约30%,这种变化的程度和不稳定性会影响到保护渣的物理性能,从而影响结晶器散热、保护渣的消耗量及保护渣在结晶器内的行为。以上因素综合作用,导致铸坯表面产生横向和纵向凹陷及裂纹。由于这种铝钙保护渣在连铸生产高铝TRIP钢时,不易发生反应而备受人们的关注。在安赛乐米塔尔美国公司(AM-USA)的两家研发中心—东芝加哥中心和施托尔贝格进行了这两种保护渣的生产试验,研究相对于传统的硅钙保护渣,新保护渣对生产高铝TRIP钢的影响。利用光学显微镜、阴极发光显微镜和扫描电子显微镜来检查结晶器中的渣膜层,以此来确定渣层中沉淀物的性质和分布。铝钙保护渣的使用使钢/渣间的化学反应有了明显的变化,改善了铸坯的表面质量。
Continuous casting of high strength steel, such as high-aluminum phase transition induced plasticity (referred to as TRIP steel), the traditional calcium silicate mold flux due to the sharp decline in SiO2 and showed the inherent instability. The decrease of silicon dioxide in the mold powder led to an increase of about 30% in the alumina. The degree and the instability of the change affected the physical properties of the mold powder, thus affecting the heat dissipation of the mold, the consumption of the mold flux and the flux In-house behavior. The combined effect of the above factors, resulting in slab surface produce horizontal and vertical depressions and cracks. Because of this calcium aluminum mold flux in the continuous casting of high-aluminum TRIP steel, less prone to reaction and much attention. Two production tests for mold fluxes were carried out at the two R & D centers at ArcelorMittal USA (AM-USA) - Toshiba Center and Stolberg. Compared with the traditional calcium silicate mold fluxes, Effect of New Mold Powder on Production of High Aluminum TRIP Steel. The properties and distribution of precipitates in the slag layer were determined by examining the slag layer in the crystallizer using an optical microscope, a cathodoluminescence microscope and a scanning electron microscope. The use of Al-Ca flux makes the chemical reaction between steel and slag obvious changes, and improves the surface quality of castings.