The development of the high strength steel strip packing

Developed product packaging can meet high strength steel strip after inspection requirements. 2 new steel reinforcement mechanism improving strength the most economic way is to improve the carbon content to increase the content of pearlite, when carbon content is more than 0. With the new development of high-strength packing li the trial production of special steel is developed by adopting new alloying, add one small amounts of niobium in steel, so that to further increase the strength of the mild steel, through the temperature control, controlled rolling to make full use of niobium microalloy element solid weld reinforcement, improve the comprehensive performance of steel, and then adopt the method of low temperature annealing process to produce high strength steel strip packing. Add Nb steel works, refine the grain size, precipitation strengthening, eliminate free nitrogen fixed nitrogen. The outstanding characteristic of niobium is improved the austenite recrystallization temperature and thus refine austenite crystal pulling, recrystallization during hot working in the area with large deformation increase the total grain boundary area, at the same time due to the effect of strain induced precipitation makes the interface phase transition when the merit of nucleation sites, therefore niobium has very good role of fine grains; Niobium and nitrogen fixation, niobium is one of the strong carbonitride formation elements, the formation of it tend to be higher than in bC. So it is generally believed to Nb (often CN） The form. High temperature and precipitation of carbon and niobium nitride in the original austenite grain growth effect, hot working process in the deformed austenite recrystallization and grain boundary move drag, for solution of mud, suppress a y a. Shift, reduce the transition point, (precipitate after phase transformation or phase transition of Nb CN） To strengthen the precipitation of the existing body of the strong role; The converter steel nitrogen content in the 40 - in our country 88 PPM, another role is niobium and niobium and carbon and nitrogen form of Nb ( CN） Through the adjustment of chemical composition in steel and add the micro elements, and give full play to in the steel strip production process and application of three kinds of niobium, make steel with both high strength, and good toughness, steel belt packaging can meet high strength steel strip after heat treatment of the performance index requirements.