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通过对超纯11％铬铁素体不锈钢连铸水口结瘤物不同部位的金相观察、能谱分析以及其冶炼过程钛氧化物和铝氧化物形成的热力学分析，结合实际生产数据研究了超纯11％铬不锈钢连铸过程水口结瘤的机理。结果表明：超纯11％铬铁素体不锈钢水口结瘤主要是钢水中钛的氧化物质量分数较高，在浇铸过程中钛的氧化物和水口中的 Al2 O3反应生成复合氧化物黏附在水口壁，并不断地富集和黏附其他夹杂物和钢水增厚所致。通过钢液中O、Al、Ti 等成分的控制、冶炼过程深脱氧、增加精炼弱吹时间、增加浇铸前镇静时间、防止钢水二次氧化和适当地提高浇铸过热度等可有效地防止超纯11％铬铁素体不锈钢水口结瘤产生。“,”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 observa-tion and energy spectrum analysis as well as the thermodynamic calculation for titanium and aluminum oxides forma-tion.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 Al2 O3 in nozzle refractory adhered to the nozzle wall,enriched continuously and adsorbed other inclusions and mol-ten 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.