cr1mov钢用焊条的研制及熔敷组织性能的研究word格式论文.docxVIP

AbstractHot-wall hydro-processing reactor is the key equipment in modern oil refinery and coal liquefaction industry. It works in the long-term high temperature and high pressure hydrogen environment. With the development of oil refining industry, the requirement for the steel is getting higher. The new 2.25Cr-1Mo-0.25V steel can well satisfy the manufacturing of modern hydro-processing reactor. The special steel for hydro-processing reactor manufacturing has been already domestically produced. However, the welding electrode consumables still need to import from the foreign countries. 2.25Cr-1Mo-0.25V steel has become the major material for hydro-processing reactor industry. This paper has been developed a new type of consumable welding electrode for 2.25Cr-1Mo-0.25V steel and has investigated the mechanical and microstructural properties of the deposited metal.The experimental results of the welding metal investigation suggested that the main microstructure in the welding metal was the granular bainite, which was comprised of thin strip ferrite and the carbide. The granular bainite has great ductility and low-temperature toughness and its formation temperature was between the formation temperature of the upper bainite and the transition temperature from austenite to bainite.The effects of the rare earth on the deposition microstructure, the low-temperature iMPact-resistance property and the diffusible hydrogen content were investigated. The experimental results showed that with the increase of the rare earth content in weight, the low-temperature iMPact-resistance property of the deposited metal gradually increases. The diffusible hydrogen content in the deposited metal gradually decreases. The best combination property is obtained when the weight content of the rare earth is about 2.5%. With more rare earth, the iMPact toughness declines. This study has also studied the effect of Nb on the microstructural and mechanical properties of the deposited metal. The resul