在430不锈钢冶炼过程的AOD结束、LF结束及中间包浇注末期分别取钢样,利用扫描电镜和能谱仪分析了夹杂物的类型及形貌特征,并探讨了夹杂物的演变规律及其形成原因。研究得知：随着冶炼过程的进行,钢液中总氧含量有所降低,夹杂物的含量逐渐减少,尺寸逐渐变小。夹杂物类型：AOD中主要为CaO-SiO2-MgO;LF和连铸中间包中主要为CaO-SiO2-MgO-Al2O3,但成分略有不同;中间包中发现有含MnO的夹杂物。AOD末期CaO-SiO2-MgO系夹杂物成分与炉渣成分接近;在LF以及中间包中夹杂物的成分与精炼工艺、保护浇注和钢液温度的降低有关。
Samples taken from the end of AOD, LF and tundish casting operations of the AOI〉LF-TD process dur ing 430 stainless smelting process were investigated and identified through the scanning electron microscope with an EDS X-ray analyzer to characterize the inclusions in terms of the chemical composition, size and morphology. The results show that the total oxygen content, the inclusion content and size decrease throughout the AOD-LF TD process. Additionally, the types of inclusions change at different stages of the process; the inclusions in AOD are mainly CaO-SiO2-MgO compounds, while in LF and tundish, it is detected mostly CaO-SiO2-MgO-Al2O3 inclusions, besides, inclusions with MnO compound are also found in tundish. Meanwhile, the inclusions in AOD with the com- pounds of CaO-SiO2-MgO are found to be close to the slag composition. The variation of the composition of the in clusions in LF and tundish are related to the refining process, continuous casting protection as well as temperature drop.
参考文献
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