未来大量废钢资源循环利用中必将面临如何有效消除残余元素有害影响这一科学难题。本项目着眼于残余元素铜砷对钢铁生产过程中钢热塑性、热加工性的危害及稀土改善这两方面的综合效果、机制等基础科学问题。.通过研究铜砷含量对钢热塑性的影响规律，掌握铜砷晶界偏聚与钢热塑性恶化的关系；通过不同铜砷含量水平下钢的高温氧化性及模拟轧制实验评估其对热裂敏感性的研究，掌握砷影响富铜液相浸润晶界而诱发热裂的机制，如富铜液相成分、熔点、润湿性等，为连铸矫直和后续加热、轧制过程避开裂纹敏感区操作提供理论依据和技术支撑。同时，通过本项目研究，揭示稀土与残余元素晶界竞争偏聚、稀土与残余元素相互作用两者改善铜砷恶化钢热塑性的科学关系；掌握稀土抑制铜砷引发钢表面开裂的作用及机制，为该方法的实际应用奠定理论基础。

During the recycling process of steel scrap, eliminating the detrimental effect caused by residual elements is a difficult scientific problem had to be faced. In this project, the adverse influence of copper and arsenic on hot ductility and hot workability of steels and the suppression effect of adding rare earth will be systematically studied.. Through the influence mechanism investigation of copper and arsenic content on hot ductility of steels, the relationship between grain boundary segregation of Cu+As and hot ductility will be acquired. Thermal cracking sensitivity will be evaluated by high temperature oxidation under different level of Cu+As and rolling experiment. From it, the effect mechanism of As on Cu-rich liquid infiltrating boundary and induced hot crack including its content, melting point, wettability, etc., which provides theoretical basis and technical support for the operation of continuous casting, subsequent heating and avoiding crack sensitive region in rolling process. Meanwhile, the project will declare the scientific relationship improved Cu+As induced hot ductility detriment between competing segregation and interaction of rare earth and residual elements. Revealing the effect and mechanism of Cu+As caused surface crack will lay a theoretical foundation for the practical application of the above method.