Study on the Aggregation of Inclusions for Calcium Aluminate in High-Melting Point
In the current paper,size,area,composition,type and distribution of non-metallic inclusions with high-melting point(CaO·2Al2O3 and CaO·6Al2O3)in inspection substandard samples were analyzed by aspex explorer automated scanning electron microscope.The distribution of inclusions in the thickness direction of slab produced in Pretreatment of hot metal → LD → LF → Calcium treatment → RH → CC process was stuied,indicating that the number of inclusions inner arc is the maximum,and the inclusions at the center is minimum.Whereas,the number of less than 10μm inclusions is the maximum in loose side,and that of larger than 10μm inclusions is the maximum in the center.The causes of the aggregation behavior of calcium aluminate in highmelting point were investigated in the nature of non-metallic inclusions,the characteristics of continuous casting machine and behavior of nonmetallic inclusions during solidification.The results show that calcium aluminates with high-melting point are easier to gathered and aggregate.When the Al2O3 content of calcium aluminate inclusions is 80%,the aggregation ability is the strongest.The casting speed of the curved continuous casting machine is slower compared with the average arc caster.The smaller thickness of slab and rapid solidification lead to the earlier solidification end,and formation of an easy gathering area near the center during the solidification.The inclusions are pushed,engulfed and aggregated in the solidification.Since floating in space and time reduced,and promoting of the capture,there is a concentrated area of the large-size inclusions formed in the center of slab.
non-metallic inclusions of class B aggregation refractory calcium aluminate
Rensheng CHU
Shougang Research Institute of Technology,Beijing 100043,China
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
737-740
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）