高建钢Q420GJZ35大型夹杂物行为  

STUDY ON BEHAVIOR OF LARGE INCLUSIONS OF HIGH PERFORMANCE BUILDING STRUCTURAL STEEL Q420GJZ35

作　　者：栾文林[1] 刘志远[1] 孙立根 朱立光 王重君 么敬文 Luan Wenlin;Liu Zhiyuan;Sun Ligen;Zhu Liguang;Wang Chongjun;Yao Jingwen(Steelmaking Department of HBIS Group Tangshan Mediume Heavy Plate Co.,Ltd.,Tangshan 063000,Hebei;College of Metallurgy and Energy,North China University of Technology,Tangshan 063210,Hebei;Hebei Engineering Research Center of High Quality Steel Continuous Casting,Shijiazhuang 053000,Hebei;Hebei University of Science and Technology,Shijiazhuang 050000,Hebei)

机构地区：[1]河钢集团唐山中厚板材有限公司炼钢部,河北唐山063000 [2]华北理工大学冶金与能源学院,河北唐山063000 [3]河北省高品质钢连铸工程技术研究中心,河北石家庄053000 [4]河北科技大学,河北石家庄050000

出　　处：《河北冶金》2024年第8期11-16,共6页Hebei Metallurgy

摘　　要：对河钢集团唐山中厚板材有限公司生产的高建钢Q420GJZ35大型夹杂物的种类、数量、尺寸等进行了试验研究,并在钢包渣、中间包覆盖剂、中间包打结料中分别加入Ba、La、Ce示踪元素追踪夹杂物来源。研究结果显示:稳态坯中大型夹杂物总体含量为16.8 mg/10kg;非稳态铸坯中含量最高36.2 mg/10 kg,根据示踪检测结果,部分夹杂黏附有钢包渣、结晶器保护渣和保护渣,其中结晶器卷渣是夹杂物的一个重要来源。通过优化改进浸入式水口,将水口由单侧口改为双侧口,侧孔长度由105 mm改为100 mm,水口出口为带圆角的方孔,并进行数值模拟分析。结果显示,改进型水口计算结晶器流场分布合理,表面波动较小,符合设计要求,有利于表面钢液的合金化和杂质的上浮。Experimental research was conducted on the types,quantities and sizes of large inclusions in high performance building structural steel Q420GJZ35 produced by HBIS Group Tangshan Mediume Heavy Plate Co.,Ltd.,and Ba,La,and Ce trace elements were added to the ladle slag,tundish covering agent,and tundish binder to track the source of the inclusions.The research results show that the overall content of large inclusions in the steady-state billet is 16.8 mg/10 kg.The highest content in non-stationary casting billet is 36.2 mg/10 kg.According to the tracer detection results,large inclusions are mainly deoxygenated inclusions formed by the collision of drainage sand and deoxygenated products.Some of the inclusions are adhered to steel ladle slag,mold powder,and casting powder,among which mold powder is an important source of inclusions.Through optimizing and improving the submersed nozzle,the nozzle was changed from a single port to a double port,the length of the side hole was changed from 105 mm to 100 mm,and the outlet of the nozzle was a square hole with a circular angle.The numerical simulation results show that the flow field distribution of the improved nozzle calculation mold is reasonable,with small surface fluctuations,which meets the design requirements and is conducive to the alloying of surface steel liquid and the floating of impurities.

关 键 词：高建钢 大型夹杂物 示踪法 板坯连铸 结晶器 流场 

分 类 号：TF769[冶金工程—钢铁冶金]