摘要
随着钢铁技术的进步和社会发展需求,钢铁企业正在研发和生产强度高、韧性好、抗腐蚀性强等各种类型的高质量特殊钢种。如何有效控制特殊钢种连铸生产工艺的稳定性是当前保护渣开发面临的共性难题。设计研发合理的保护渣化学成分、稳定其物化性能,以保证特殊钢种良好的铸坯质量是钢铁冶金领域科研人员关注的热点问题。为此,有关科研人员开展了大量的保护渣基础理论及应用研究,取得了一定的成效。大多数学者研究认为,在传统保护渣中添加一定量的TiO_(2)可以改善保护渣物化性能、提高吸附夹杂物的能力、阻止钢-渣界面反应、减少铸坯质量问题的发生。保护渣中TiO_(2)质量分数为4%~8%、碱度为1.1~1.3时,可以有效改善保护渣的熔化温度、黏度以及热流密度等物化性能,对渣膜结晶也可以起到促进作用,能基本满足高钛钢、高铝钢等特殊钢种的要求;含钛保护渣渣膜中的钙钛矿可以代替传统保护渣渣膜中的枪晶石,对保护渣的传热起着决定性的作用;含钛保护渣吸收钢水中夹杂物后,保护渣的物理性能保持稳定,并可以防止特殊钢水中的钛与保护渣发生界面反应而引起的铸坯表面“结鱼”等问题的发生;含钛型保护渣在某些特殊钢种中已进行初步探索应用并取得阶段性成果。关于渣膜中钙钛矿及其他矿物对含钛型保护渣传热的影响机理,如何更好地协调保护渣的基础性能与润滑传热机制之间的矛盾,实现含钛型保护渣在连铸工艺中的广泛应用,以满足连铸工艺优质高效稳定的生产需要,仍是冶金工作者进一步研究的主要课题。
With the advancement of iron and steel technology and the needs of social development,iron and steel enterprises are developing and producing various types of high-quality special steel grades with high strength,good toughness and strong corrosion resistance.How to effectively control the stability of the continuous casting production process for special steel grades is a common problem faced by the current mold flux development.Designing and developing reasonable chemical composition of mold slag,stabilizing its physical and chemical properties,and ensuring good slab quality of special steel grades are hot issues concerned by researchers in the field of iron and steel metallurgy.To this end,relevant researchers have carried out a large number of basic theoretical and applied researches on mold slag,and achieved certain results.Most scholars believe that adding a certain amount of TiO_(2) to the traditional mold slag can improve the physical and chemical properties of the mold slag,improve the ability to adsorb inclusions,prevent the steel-slag interface reaction,and reduce the occurrence of slab quality problems.When the TiO_(2) content in the mold slag is in the range of 4% to 8%,the alkalinity is controlled between 1.1 and 1.3,which can effectively improve the physical and chemical properties of the mold slag such as melting temperature,viscosity and heat flux density,and can also promote the crystallization of the slag film.It can basically meet the requirements of special steel grades such as high-titanium steel and high-alumina steel;the perovskite in the titanium-containing mold slag film can replace the gun spar in the traditional mold slag film,which has a great effect on the heat transfer of the mold slag.It plays a decisive role;after the titanium-containing mold slag absorbs the inclusions in the molten steel,the physical properties of the mold slag remain stable,and can prevent the "fishing" on the surface of the slab caused by the interface reaction between the titanium in the special molten steel and the mold slag.The occurrence of titanium-containing mold slag has been initially explored and applied in some special steel grades and staged results have been achieved.About the influence mechanism of perovskite and other minerals in the slag film on the heat transfer of titanium-containing mold powder,how to better coordinate the contradiction between the basic performance of mold powder and the lubricating heat transfer mechanism,and realize the continuous connection of titanium-containing mold powder.The wide application in the casting process to meet the high-quality,high-efficiency and stable production needs of the continuous casting process is still the main subject of further research by metallurgical workers.
作者
韩秀丽
刘盈盈
刘磊
闫晓鹏
刘子瑶
HAN Xiu-li;LIU Ying-ying;LIU Lei;YAN Xiao-peng;LIU Zi-yao(College of Mining Engineering,North China University of Science and Technology,Tangshan 063210,Hebei,China;College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China)
出处
《钢铁》
CAS
CSCD
北大核心
2022年第10期10-18,共9页
Iron and Steel
基金
国家自然科学基金资助项目(51774140,51574105)
河北省高校基本科研业务费资助项目(JQN2020038)。
关键词
含钛保护渣
TiO_(2)
熔化性能
结晶性能
传热机制
连铸
titanium-containing continuous casting mold flux
TiO_(2)
melting performance
crystallization property
heat transfer mechanism
continuous casting
