微合金化Q390钢连铸宽厚板坯裂纹形态及成因分析  

Analysis on Crack Morphology and Cause of Microalloyed Q390 Steel Continuous Casting Wide and Thick Slab Billet

作　　者：王冠 陈松军 李卓然 WANG Guan;CHEN Songjun;LI Zhuoran(Baowu Group Guangdong Shaoguan Iron and Steel Co.,Ltd.,Shaoguan,Guangdong 512123;School of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou,Guangdong 510641;Shaoneng Group Shaoguan Hongda Gear Co.,Ltd.,Shaoguan,Guangdong 512123;Guangdong Advanced Materials Innovation Institute Co.,Ltd.,Shaoguan,Guangdong 512123)

机构地区：[1]宝武集团广东韶关钢铁有限公司,广东韶关512123 [2]华南理工大学机械与汽车工程学院,广东广州510641 [3]韶能集团韶关宏大齿轮有限公司,广东韶关512123 [4]广东先进材料创新研究院有限公司,广东韶关512123

出　　处：《工程技术研究》2022年第22期1-4,39,共5页Engineering and Technological Research

摘　　要：利用宽厚板连铸技术生产微合金化宽厚板钢坯,可降低金属消耗、缩短生产周期和减少成本。然而微合金化钢连铸宽厚板坯易发生表面和皮下裂纹,造成铸坯清理率高,降低了金属收得率,阻碍铸坯热装热送工艺的实施,严重影响经济效益。为此,文章对国内某钢厂生产的微合金化Q390钢连铸宽厚板存在的表面裂纹特征进行观察、统计、检测和分析,并对连铸工艺参数下的结晶器流场进行了数值模拟。结果表明,微合金化Q390连铸宽厚板裂纹数量多,产生位置比较规律,裂纹深度较浅,主要含有K、Na、Si、Ca等元素,进一步推断微合金化Q390钢铸坯表面裂纹产生的内因是铸坯的热塑性差,外因是结晶器内部卷渣。The use of wide and thick slab continuous casting technology to produce microalloyed wide and thick slab billet can reduce metal consumption, shorten production cycle and reduce costs. However, the microalloyed steel continuous casting wide and thick slab billet is prone to surface and subcutaneous cracks, resulting in high billet cleaning rate, reducing metal yield, hindering the implementation of hot charging and hot delivery process of billets, and seriously affecting economic benefits. In this paper, the surface crack characteristics in microalloyed Q390 steel continuous casting wide and thick slab produced by a domestic steel plant were observed, counted, detected and analyzed, and the crystallizer flow field under continuous casting process parameters was numerically simulated. The results show that there are many cracks in wide and thick microalloyed Q390continuous casting slab with regular location and shallow crack depth, mainly including K, Na, Si, Ca and other elements. It is further inferred that the internal cause of the surface cracks in the microalloyed Q390 steel billet is the poor thermoplasticity of the billet, and the external cause is the slag entrapment inside the crystallizer.

关 键 词：Q390钢 连铸宽厚板坯 表面裂纹 结晶器数值模拟 

分 类 号：TF777[冶金工程—钢铁冶金]