Al_(2)O_(3)C质浸入式水口异常减薄与结瘤的失效分析  

Failure analysis of Al_(2)O_(3)-C submerged entry nozzles due to abnormal thinning and nodulation

作　　者：尹啸 郭浩然 郄泽民 庞洪轩 郑冰 徐东[1,2,3] YIN Xiao;GUO Haoran;QIE Zemin;PANG Hongxuan;ZHENG Bing;XU Dong(Technology Innovation Center for High Quality Cold Heading Steel of Hebei Province,Hebei University of Engineering,Handan 056038,Hebei,China;Whole Processes of High Quality Fastener Application Technology Research Center of Universities in Hebei Province,Hebei University of Engineering,Handan 056038,Hebei,China;School of Materials Science and Engineering,Hebei University of Engineering,Handan 056038,Hebei,China;Technology Innovation Center for Wear Resistant Steel Plate of High Plasticity and Toughness of Hebei Province,Hebei Puyang Iron and Steel Co.,Ltd.,Handan 056305,Hebei,China;Meson Technology(Hebei)Co.,Ltd.,Handan 056000,Hebei,China)

机构地区：[1]河北工程大学河北省高品质冷镦钢技术创新中心,河北邯郸056038 [2]河北工程大学河北省高校高端紧固件全流程应用技术研发中心,河北邯郸056038 [3]河北工程大学材料科学与工程学院,河北邯郸056038 [4]河北普阳钢铁有限公司河北省高塑韧性耐磨钢板技术创新中心,河北邯郸056305 [5]介子科技(河北)有限公司,河北邯郸056000

出　　处：《安全与环境学报》2025年第3期937-945,共9页Journal of Safety and Environment

基　　金：中央引导地方科技发展资金项目(246Z1009G)。

摘　　要：基于冶金工艺探讨连铸时Al_(2)O_(3)-C浸入式水口管壁异常减薄和结瘤的失效问题,利用宏观与显微形貌观察、化学成分分析、矿物组成分析、热力学计算等方法对失效的水口进行研究。结果表明,Al_(2)O_(3)-C水口在渣线位置存在导致管壁减薄的内外侵蚀,总侵蚀量壁厚占比达到79.17%,且径向外侵蚀量大于内侵蚀量。水口内衬结瘤物最大厚度为2.5 mm,水口浸入端内径扩孔程度达10.5 mm。对水口结瘤物的深度分析和含Ni氧化物生成热力学计算表明,在浇铸过程中钢液存在严重吸氧现象。通过系统的失效分析得出,Al_(2)O_(3)-C水口失效的主要形式是内外侵蚀和内衬结瘤,而水口管壁减薄失效的外因是浇铸过程中出现钢液的严重吸氧。本失效分析可为炼钢连铸水口的安全服役提供参考。To investigate the failure issues of Al_(2)O_(3)-C Submerged Entry Nozzles(SEN),this study examined the phenomena of abnormal wall thinning and nodulation from a metallurgical process perspective.Several experiments were conducted to explore the characteristics of the SEN after continuous casting service.First,macro measurements were conducted by longitudinally cutting the SEN,after which it was broken into pieces for further observation of micromorphology,chemical composition analysis,and mineral composition analysis.By integrating these results with relevant thermodynamic calculations,a comprehensive failure analysis of the system was performed.The study revealed several key findings:The SEN undergoes both internal and external erosion at the slag line,leading to abnormal thinning of the nozzle wall.Total radial erosion can account for up to 79.17%of the wall thickness,with internal and external erosion contributing 21.88%and 57.29%,respectively.This indicates that external erosion is significantly more pronounced.Furthermore,the maximum thickness of the nodule layer inside measures 2.5 mm,and the enlargement of the inner diameter at the outlet end of the SEN reaches 10.5 mm,representing 32.8%of the original internal diameter.A comprehensive analysis of the nodulation on the inner nozzle wall,utilizing the aforementioned methods,reveals an oxidized appearance of the nickel(Ni)element,indicating significant oxygen absorption by the SEN during the continuous casting process.Additionally,the system failure analysis concludes that the primary failure modes of the Al_(2)O_(3)-C SEN are internal and external erosion,along with the formation of nodulation.The failure mechanism can be attributed to both internal and external factors.Internally,a significant accumulation of adherent wall nodulation results in considerable fluctuations in the slag layer covering the crystallizer.Externally,severe oxygen absorption by the liquid steel during the pouring process is indicated by the presence of nickel(Ni)-containing oxidati

关 键 词：安全工程 连铸 浸入式水口 异常减薄 结瘤 失效分析 

分 类 号：X938[环境科学与工程—安全科学]