摘要
围绕薄板坯连铸连轧生产含铌汽车结构钢,开展相关研究工作及工业化实践。在欧标热轧汽车结构钢中选取代表性钢种S355MC和S420MC,根据产品技术要求及合金元素在钢中的作用,确定了低碳、低硅、高锰、铌钛微合金化的成分体系;针对产品的成分特点,确定了冶炼工艺制度,转炉采用金属锰配锰,精炼采用中碳锰铁微调,同时转炉采用高温出钢,从而有效地避免了增硅、增碳;通过开展高温热塑性实验研究,获取了S355MC钢和S420MC钢的高温塑性随温度的变化规律,确定了连铸采用高碱度保护渣,二冷采用弱冷模式;依据控轧控冷过程中微合金元素的析出规律及相变机理,确定了板坯加热温度、粗轧出口温度、终轧温度、卷取温度等关键工艺控制点,使产品组织性能获得有效控制。
Focusing on the production of niobium-containing automotive structural steel by thin slab continuous casting and rolling, relevant research work and industrial practice were carried out combined with the product technical requirements of hot-rolled automotive structural steel S355 MC and S420 MC selecting from the European standard and the role of alloy elements in the steel, the composition system of low-carbon, low-silicon, high-manganese and niobium-titanium microalloyed was determined. The smelting process system was determined according to the composition characteristics of the product, the converter adept metal manganese with manganese to effectively avoid the increase of silicon and carbon, and LF adept medium carbon ferromanganese for fine adjustment. At the same time, the converter was required to tap at high temperature. The law of high temperature plasticity for S355 MC and S420 MC steels changed with the temperature was obtained from the high temperature plasticity experiment, it was determined that the continuous casting adept high basicity casting powder, and weak cooling mode was used in the secondary cooling. The key process control points such as slab heating temperature, rough rolling outlet temperature, final rolling temperature and colling tempereoture were deterimined according to the precipitation law and phase transformation mechanism of microalloyed elements in the process of controlled rolling and controlled coding, so that the structure and properties of products were effectively controlled.
作者
杨丽
董欣欣
刘丽萍
Yang Li;Dong Xinxin;Liu Liping(Department of Materials Engineering,Tangshan Vocational College of Science and Technology,Tangshan 063000,China;Technical Center of Tanshan Iron&Steel Group Co.,Ltd.,Tangshan 063000,China)
出处
《锻压技术》
CAS
CSCD
北大核心
2022年第6期148-152,共5页
Forging & Stamping Technology
基金
河北省高等学校科学研究项目(QN2021411)。
关键词
薄板坯连铸连轧
高温热塑性
保护渣
铌钛微合金化
控轧控冷
thin slab continuous casting and rolling
high temperature thermoplasticity
casting powder
niobium titanium microalloyed
controlled rolling and controlled coding
