The Theory And Practice Research Of Iron And Steel Material Forming Process Based On Saving Type Reducing Quantity

Under the background of circular economy, this thesis was completed on the base of iron material forming process. Aiming at key technologies and key points which was found out during the theory and exercise steel material forming process equipped with saving-type quantitative reduction theory, several systematized research was carried out, and then, combining with laboratory work and its industrial application, saving-type quantitative reduction technology's practical application effect was illustrated.According to current steel industry's development status of high energy consumption, high resources-energy stress and serious environment problem, this thesis pointed out that steel material forming process's saving-type quantitative reduction was a chief part of steel industry development circular economy, and was regarded as a inevitable choice of steel industry sustainable development.On the base of analyzing current steel material forming process development status, accounting into the energy resource consumption during steel material forming process, and combining with the target of steel material saving-type quantitative reduction, steel material forming process evaluation index system was established. This system included 4 first grade indexes (which were saving heat energy, saving water and electricity, saving resource and reducing environment emission) and 15 second index. After considering qualitative analysis and quantitative study, steel quantitative reduction analysis model was proposed on the ground of analytic hierarchy process and fuzzy comprehensive evaluation method. To be more specific, analytic hierarchy process was used to calculate each index's influence weight to its higher index and fuzzy comprehensive evaluation method was used to evaluate steel enterprise's quantitative reduction production grades. The practice showed that these theories were able to evaluate quantitative reduction production grade, and also were able to guide enterprise for quantitative reduction production. On the foundation of that, modern steel enterprise quantitative reduction production operation mechanism was elaborated furtherly. Steel material forming process's quantitative reduction technology was closely related to steel products' production process. As for the steel products production manufacturing process, the basic principle was reducing the energy resource which entered into production and consumption process, that is, resource was saved at the beginning and then utilization ratio was increased and waste material was prohibited. Therefore, quantitative reduction technology was, on the one hand, reflected on the face of chemical composition design, such as reducing iron ore and alloy content, and, on the other hand, reflected on the aspect of technology process design, such as reducing working procedure to decrease energy consumption. In fact, chemical composition design was supported by technology improvement and technology process design was also reflected by chemical composition design quantitative reduction. During the steel material forming process, steel temperature was varied, and then complicated phase transition was occurred, therefore, all kinds of characteristic was obtained through chemical composition design and heat treatment technology. This was the foundation of steel material forming process quantitative reduction. In this thesis, according to steel material forming processing flow and then combining with traditional TMCP technology analysis, new generation TMCP technology's realization condition and its laboratory research and potential application in wire and rod and plate-strip fields was discussed.As for steel material's forming properties, steel material forming process quantitative reduction was also reflected in the field of flexible rolling technology which was based on microstructure control. On the base of new generation steel material development practice, different characteristic products produced by the same chemical composition was realized, and its most significant benefits was that steelmaking process was liberated furtherly.Life cycle quantitative reduction which related to steel material's recycle and reuse was one of the most components of saving-type steel material. Combining with life cycle evaluation theory and steel material's forming process characteristic, steel products life cycle evaluation methods was established. To be more specific, the model was LCA model based on multi-objective programming. The model's efficiency and feasibility was proved by application example.In the end, combining with SHOW GUAN steel corporation production practice, saving-type quantitative reduction technology was utilized in that corporation. Through analyzing the application results, we can find out that enterprise circular economy development was promoted and enterprise's saving-energy demands was satisfied.