Mechanism on nozzle blockage of ultra purified 11%Cr ferritic stainless steels
LI Yan1, LI Ju- cang2
（1. Technology Center, Jiuquan Iron and Steel Group Co., Ltd., Jiayuguan 735100, Gansu, China 2. Hongxing Iron and Steel Co., Ltd., Jiuquan Iron and Steel Group Co., Ltd., Jiayuguan 735100, Gansu, China
Abstract：Combined with actual production data, the mechanism on nozzle blockage during continuous casting process of ultra purified 11%Cr ferrite stainless steels (11%Cr UP- FSS) was investigated by metallurgical observation and energy spectrum analysis as well as the thermodynamic calculation for titanium and aluminum oxides formation. The result showed that nozzle blockageof 11%Cr UP- FSS was mainly caused by the high Ti- oxides content in molten steel. During the casting process, the compound oxides generated from the reaction between Ti- oxides and Al2O3 in nozzle refractory adhered to the nozzle wall, enriched continuously and adsorbed other inclusions and molten steel, which can make the nozzle wall thicker. Nozzle blockage of 11%Cr UP- FSS can be effectively prevented through controlling the O, Al, Ti contents in steel, using deep deoxidization during smelting process, increasing the soft blowing time and holding time, preventing the secondary oxidation and casting in higher degree of superheat.
收稿日期: 2014-12-18
出版日期: 2015-11-27
通讯作者:
张有余
E-mail: zhangyouyu@jiugang.com
引用本文:
李岩，李具仓. 超纯11%铬铁素体不锈钢水口结瘤的机理[J]. 中国冶金, 2015, 25(11): 45-50.
LI Yan, LI Ju- cang. Mechanism on nozzle blockage of ultra purified 11%Cr ferritic stainless steels. China Metallurgy, 2015, 25(11): 45-50.
2015, Vol. 25 
