Research On Technologies Of Inclusion Control Of J65Mn Steel

In the iron and steel economic situation is extremely grim today, and the quality of the products in the steel market is particularly important, how to fully exploit the properties of iron and steel materials, improve service quality, prolong the service life, to improve the rate of the use of resources and energy to the national economy development become is more commonly used for saw blade steel iron and steel research important topic.J65 Mn steel and is currently one of the main materials in the domestic production of various kinds of saw blade, this paper for Laigang steelmaking quality fluctuation of plant the old liberated areas J65 Mn production process, for the analysis and research, the main work and conclusions are as follows:1. Laiwu Steel J65 Mn fluctuations in the quality is mainly manifested in excessive amount of inclusions, bring the rolling process defects, this paper for the inclusion of excessive were investigated, analysis, found mainly B, C class inclusion exceeded.2.for the rolling material metallographic, electron microscopy analysis, can be found in the morphology of inclusions, size, at the same time, according to the actual production situation of converter, refining, continuous casting process analysis of three processes, respectively, analysis of the causes of inclusion.3.from the Laiwu steel production situation analysis, B, C type inclusions exceed the standard the main reason exists in refining, continuous casting process, this paper focuses on refining, continuous casting process were analyzed, and the optimization of refining slag, mode of operation, while the bottom argon blowing mode, Ca precision control technology research, stability the calcium aluminum in steel ratio, improve the ability of refining slag. The adsorption of inclusions in continuous casting mainly from the full protection casting start, will likely have two oxidation parts of equipment modification, process optimization, forming a continuous casting closed without oxidation all shield casting technology, radically reducing the total oxygen content in steel thus, the stability of the inclusion level, implementation of the J65 Mn quality improvement and batch production, won the market for Laiwu narrowband.4. by adopting a series of process optimization, equipment modification measures, the success of the J65 Mn steel in the level of inclusions, forming a set of curing operation mode and key control measures.