摘要
带钢无头连铸连轧技术(ESP)是在传统热轧工艺基础上进行改进的工艺,有更高的工作效率、成本优势和产品竞争力。连铸过程中,钢水在结晶器内有着复杂的热/力学行为,精确控制钢水在结晶器内的流动、传质、凝固、受力和溶质再分配,是保证铸坯质量的关键。本文介绍了ESP工艺的研究背景,阐述了其工艺优势和国内发展状况。在此基础上,着重分析了连铸结晶器中温度场的变化、保护渣的作用以及轧制时的温度场变化,为ESP工艺优化提供理论参考。通过对ESP工艺的优化设计进行深入分析,对产线中因高拉速造成的轧辊磨损快和难以批量生产特殊钢种的问题,提出在线换辊、一对一设计产线工艺参数以及保护渣化学成分,并结合ESP工艺特点及我国冷轧钢市场,对“以热代冷”的可行性进行了分析。认为,国内薄板钢“以热代冷”具有广阔的发展前景,但目前研发生产的“以热代冷”热轧板较少,仍需要进一步探索。虽然ESP工艺已经能生产超薄规格的热轧带钢(<1.0 mm),但却无法实现量产,对于相同化学成分的钢材,不同的铸造工艺也会有很大的显微组织及力学性能差异。目前,ESP工艺对板材内部组织转变的影响仍未建立一个完整的理论体系,钢材内部组织转变及合金元素扩散的影响将是未来研究的重点方向。
The ESP technology is an improved process based on the traditional hot rolling process,which has higher working efficiency,cost advantage and product competitiveness.In the process of continuous casting,molten steel has complex thermal mechanical behavior in the mold.Precisely controlling the flow,mass transfer,solidification,force and solute redistribution of molten steel in the mold is the key to ensure the quality of the casting billet.This paper introduces the research background of ESP technology,and expounds its technological advantages and domestic development status.On this basis,the change of temperature field in continuous casting mold,the role of protective slag and the change of temperature field during rolling are analyzed,which provides a theoretical reference for optimizing ESP process.Based on the in-depth analysis of ESP process optimization design,the problems of fast roll wear and difficult mass production of special steel grades caused by high drawing speed in the production line were put forward,the process parameters of on-line roll change,one-to-one design of production line and chemical composition of design protection slag were proposed,and the feasibility of"replacing cold with hot"was analyzed in combination with ESP process characteristics and China's cold rolling market.It is believed that the"hot instead of cold"of sheet steel in China has a broad development prospect,but there are few"hot instead of cold"hot rolled plates developed and produced at present,and further exploration is still needed.Although the ESP process has been able to produce ultra-thin specifications of hot rolled strip steel(<1.0 mm),it has not been able to achieve mass production,for the same chemical composition of steel,different casting processes will have great differences in microstructure and mechanical properties.At present,a complete theoretical system has not been established for the effect of ESP process on the internal structure transformation of sheet metal,and the effect of the internal structure tr
作者
明章生
栗克建
曹鹏军
冯毅
朱斌
马鸣图
Ming Zhangsheng;Li Kejian;Cao Pengjun;Feng Yi;Zhu Bin;Ma Mingtu(School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331;China Automotive Engineering Research Institute,Chongqing 401122;Baowu Metallurgical Navigation Research Technology Co.,Ltd.,Chongqing 400080;Sino-singapore(Chongqing)Ultra High Strength Materials Research Institute Co.,Ltd.,Chongqing 401326)
出处
《河北冶金》
2024年第2期1-8,共8页
Hebei Metallurgy
基金
重庆科技学院研究生科技创新项目(YKJCX2220229)。
关键词
ESP
结晶器
保护渣
以热代冷
组织转变
合金元素
ESP
crystallizer
protective slag
replace cold with heat
organizational transformation
alloying element
