摘要
LF作为二次精炼设备,在现代炼钢工艺中扮演着关键角色,其内衬耐火材料的性能对钢液成分控制、生产效率及成本效益至关重要。镁碳砖由于其优异的高温强度和抗侵蚀性,常被用作LF内衬材料。然而,在LF钢水加废钢工艺模式下,废钢的加入会导致钢渣成分波动,从而阶段性降低钢渣碱度,进而加剧镁碳砖的侵蚀损毁。研究以某钢厂LF镁碳砖为对象,探讨了钢渣碱度变化对镁碳砖侵蚀行为的影响机制。研究表明,在高碱度(R=4.88)时,侵蚀主要表现为渗透;而在低碱度(R=1.57)条件下,则更倾向于熔解,且随着碱度降低,熔解速度加快,侵蚀层增厚。同时,通过现场侵蚀后镁碳砖的分析验证了试验结果,为延长镁碳砖使用寿命提供了理论依据。
As a secondary refining apparatus,the ladle furnace(LF)plays a pivotal role in contemporary steelmaking processes.The performance of LF lining refractory materials is crucial for controlling the composition of molten steel,enhancing production efficiency,and ensuring cost-effectiveness.Magnesia-carbon bricks are frequently utilized as lining materials for their superior high-temperature strength and excellent resistance to erosion.However,under the process model of adding scrap steel to molten steel in LF,the introduction of scrap leads to fluctuations in slag composition,which periodically reduces the slag basicity and consequently accelerates the erosion and degradation of magnesia-carbon bricks.This study focuses on the magnesia-carbon bricks used in the LF at a steel plant,investigating the impact mechanism of changes in slag basicity on the erosion behavior of these bricks.Research findings indicate that at high basicity(R=4.88),erosion primarily manifests as infiltration;whereas at low basicity(R=1.57),dissolution becomes more prominent,with the rate of dissolution increasing and the thickness of the eroded layer growing as basicity decreases.Furthermore,the analysis of post-service magnesia-carbon bricks from the field corroborates the experimental outcomes,providing theoretical insights for extending the service life of magnesia-carbon bricks.
作者
沈继胜
周甫
周武
李杨
张华
SHEN Jisheng;ZHOU Fu;ZHOU Wu;LI Yang;ZHANG Hua(R&D Center of Wuhan Iron&Steel Co.,Ltd.,Baosteel Central Research Institute,Wuhan 430080,China;Long Product Plant of Wuhan Iron and Steel Co.,Ltd.,Wuhan 430083,China;Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking,Wuhan University of Science and Technology,Wuhan 430081,China)
出处
《炼钢》
北大核心
2025年第4期45-50,83,共7页
Steelmaking
关键词
LF精炼炉
钢渣碱度
镁碳耐火材料
侵蚀行为
ladle furnace
slag basicity
magnesia-carbon refractories
erosion behavior
作者简介
通信作者:李杨(1986-),男,博士,教授,E-mail:liyang2468@wust.edu.cn。
