薄板坯夹杂物行为的研究

Inclusion Behavior of FTSC Thin Slab

采用示踪法研究了FTSC薄板坯夹杂物行为。研究结果表明，显微夹杂物主要来源于脱氧产物与钢液面污染物的复合物。大型夹杂物中钙铝酸盐夹杂占56％，复杂化合物夹杂占39％，二氧化硅夹杂约占5％。大型夹杂物主要来源于脱氧产物与中间包液面的污染，水口熔损影响较小。在唐钢一炼钢现行生产条件下，FTSC薄板坯中ω（TO）为25×10^-6，显微夹杂物体积率平均为0．024％，大于50μm的大型夹杂物平均为0．2466mg／（10kg）。显微夹杂中12CaO·7A12O3占62．15％，3CaO·A12O3占24．44％，A12O3占13．41％；显微夹杂中0～5μm的夹杂占85％以上，5～10μm的则占约9％，而大于10μm的夹杂不足5%。

By tracer method, the inclusion behavior during FTSC （flexible thin slab casting） thin slab casting was studied. The results show that the inclusions mainly are products of deoxidization and the pollutants on the surface of molten steel. Among the large conclusions, the content of calcium aluminates is 56 %, complicated compounds is 39% and silicon dioxide is 5%. The total oxygen content in FTSC thin slab produced at Tangshan Steel is 25 × 10^-6. The average volume fraction of the micro conclusion is 0. 024% and the content of the macro inclusions which are greater than 50 μm is average 0. 246 6 mg/（10 kg）. The composition of large inclusions; the content of 12CaO · 7A12O3 is 62. 15%, 3CaO · A12O3 is 24.44%-and A12O3 is 13.41%. The size distribution of large inclusions： from 0 μm to 5 μm is over 85%, from 5 μm to 10 μm is about 9% and greater than 10 μm is lower than 5%.