Abstract：The size， area， composition， type and distribution of non-metallic inclusions with high-melting point (CA2 and CA6， which C： CaO， A： Al2O3) in inspection substandard samples were analyzed by aspex explorer automated scanning electron microscope. To analyze the reason that why the center is the concentrated area of the large-size inclusions， three aspects for the causes of calcium aluminate with high-melting point causing the aggregation behavior for flaw substandard is focused on： features of non-metallic inclusions， the characteristics of continuous casting machine and the behavior of nonmetallic inclusions during the process of solidification. The results show that calcium aluminate with high-melting point gathered together， and is easy to aggregate. The casting speed is slow for the curved continuous casting machine compared with the average arc caster. The thickness of slab is thin and the molten steel solidifies rapidly， which makes the solidification end generate early， and form an easy gathering area near the center during the steel solidification. The inclusions are pushed and engulfed in the shell and will aggregate. While the space and time of floatation is reduced， combined with the effect of promoting the capture， the center forms a concentrated area of the large-size inclusions.
初仁生. 钢中高熔点钙铝酸盐类夹杂物聚集行为[J]. 钢铁, 2015, 50(7): 26-31.
CHU Ren-sheng. Aggregation of inclusions for calcium aluminate with high-melting point. Iron and Steel, 2015, 50(7): 26-31.
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2015, Vol. 50 
