摘要:
针对某厂生产O5板的工艺流程(铁水预脱硫→转炉→钢包改质剂→RH→连铸),系统分析各工序及铸坯中T[O]、[N]含量和显微夹杂物的类型、来源、数量及组成。结果表明:铸坯中T[O]为25.67×10-6,[N]为27×10-6,显微夹杂物数量为2.66个/mm2,显微夹杂物类型主要有TiN夹杂、TiO2-FeS夹杂和Al2O3夹杂,其含量分别为30%、24.55%、20.91%。RH破真空后钢水中T[O]、[N]含量偏高,钢中显微夹杂物的数量较多,说明RH真空处理尚有余地;钢中夹杂物上浮去除效果较差,提高钢包顶渣吸附夹杂物的性能是提高钢品质的一个途径;铸坯中显微夹杂物近一半为不规则夹杂物,因此夹杂物充分地液化、聚集、上浮是进一步提高O5板品质的关键。
Abstract:
T[O]and[N]and the type,source,quantity and composition of micro inclusions during the production route of O5 sheet steel(pre-desulfuration → BOF → ladle slag modifier → RH → CC) had been,analyzed.The results showed that T[O]is 25.67×10-6,[N]was27×10-6,and the number of micro-inclusions per mm2was 2.66 in slab.The main types of micro-inclusion in casting billet were TiN,TiO2-FeS and Al2O3 inclusions and their contents were 30%,24.55%,20.91% respectively.After RH vacuum break the molten steel still had high T[O],[N]and large quantity of micro-inclusions,indicating insufficient RH vacuum treatment.Floating and removal of inclusions in steel was less effective,thus improving the ladle top slag inclusions adsorption performance is one way to improve the quality of steel.slab,nearly half of micro-inclusions in slab were irregular shape,therefore,fully liquefying,aggregation and floating of micro inclusion are essential to improve the quality of O5 sheet steel.
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