摘要
钢中外来夹杂物的来源主要包括精炼渣、中间包覆盖剂、结晶器保护渣的卷渣或下渣,耐火材料侵蚀以及水口结瘤物脱落等,尤其是卷渣所带来的夹杂物粒径大、频次高、偶然性大、影响因素复杂、对产品的性能影响较大。示踪试验是探究钢中卷渣夹杂物来源的重要研究方法,对于精炼渣和中间包覆盖剂需加入含特定元素的示踪剂用于追踪,常用示踪剂有稀土氧化物、BaCO_(3)、BaO、SrCO_(3)等,结晶器保护渣中含有一定的K和Na,可以作为后续追踪的元素。在渣中加入La_(2)O_(3)和Ce_(2)O_(3)类稀土氧化物示踪剂后,La_(2)O_(3)和Ce_(2)O_(3)类可以与钢中夹杂物发生反应,导致夹杂物中的La_(2)O_(3)和Ce_(2)O_(3)增加。同时,随着钢中铝含量的增加,渣中La_(2)O_(3)和Ce_(2)O_(3)类稀土氧化物的还原也更为明显。因此,在稀土氧化物示踪实验研究中,不能只依据夹杂物中发现了含有一定量稀土氧化物,就直接判定夹杂物来源于卷渣,应该结合卷渣类夹杂物的成分、元素含量和分布位置等多种因素综合判断。此外,由于示踪剂成分可通过渣钢反应进入钢液并改性钢中内生夹杂物,因此在示踪实验研究中,应该结合卷渣类夹杂物的成分、元素含量和分布位置等多种因素综合判断。
Sources of exogenous inclusions in steel are mainly from the entrapment of refining slag,tundish covering flux,mold flux,the erosion of refractory materials and the shedding of nozzle nodules.Slag inclusion,characterized by a large particle size,high frequency,high randomness and complex influencing factors,exert a significant impact on product performance.Tracer tests are an important research method for exploring the sources of slag-entrained inclusions in steel.For refining slag and tundish covering flux,it is necessary to add tracer agents containing specific elements for tracking.Commonly used tracers include rare earth oxides,BaCO_(3),BaO,SrCO_(3),etc.The mold powder contains certain amounts of K and Na,which can be used as subsequent tracking elements.After adding rare earth oxide tracers such as La_(2)O_(3)and Ce_(2)O_(3)to the slag,these oxides can react with inclusions in the steel,causing the content increase of La_(2)O_(3)and Ce_(2)O_(3)in the inclusions.Additionally,as the Al content in the steel increases,the reduction of La_(2)O_(3)and Ce_(2)O_(3)content in the slag becomes more pronounced.Due to the tracers can enter the molten steel through the slag-steel reaction,and modify endogenous inclusions.Therefore,comprehensive judgment should be made considering various factors such as the composition,content,and distribution of slag-entrained inclusions.
作者
张军国
张贺君
王彬
姜仁波
王博辰
任英
张立峰
Zhang Junguo;Zhang Hejun;Wang Bin;Jiang Renbo;Wang Bochen;Ren Ying;Zhang Lifeng(Tangshan Iron and Steel Group Co.,Ltd.,Tangshan 063000,Hebei;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)
出处
《河北冶金》
2025年第5期37-44,90,共9页
Hebei Metallurgy
基金
国家重点研发计划(2023YFB3709900)
国家自然科学基金(U22A20171)
河钢重点科技项目(HG2022103)。
关键词
夹杂物
示踪
渣钢反应
元素含量
分布位置
卷渣
稀土氧化物
inclusions
trace
slag-steel reaction
element content
distribution location
slag entrapment
rare earth oxides
