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With the rapid development of China's national economy, stimulating the surge in steel consumption, promote the rapid growth of the steel industry. As our country's infrastructure is still based on a reinforced concrete as the main material, so many years the largest rebar and wire rod has been in the construction steel consumption. However, due to the rapid growth of steel consumption and production, alloy resources are increasingly scarce, especially vanadium resource shortages and rising prices, soaring production costs, have jeopardized the survival and development of the iron and steel enterprises, will also restrict the healthy development of China's national economy, Therefore, in order to conserve the limited resources, and actively reduce the alloying elements in steel, micro alloy content, improve the performance and efficiency in the use of iron and steel products, reduce production costs, is a major topic of steel workers face grim and arduous. The development of the subject carried out in view before the development of the HRBF500 Ⅳ grade hot rolled steel deformation induced ferrite phase transformation (DIFT) theory based, full temperature control process, has been achieved without adding any micro-alloying elements (Nb, V, Ti) case, the use of ordinary carbon steel 400MPa Grade Ultrafine grain diameter on mass production and large-scale high-speed wire rod mill Φ6, Φ8, Φ10mm small specifications twisted steel. The purpose of this project is to develop and produce without Nb, V, Ti microalloying elements HRBF500 Ⅳ grade steel, to make the necessary technical reserves for the enterprise. The implementation of specific programs: the first step to understanding the development HRB500 rebar, to determine the practical significance of the development of micro-alloying elements such as V, Ti HRBF500 Ⅳ grade steel without Nb,; second step, the development HRB500 ultrafine grain the tablets reinforced theoretical research, product development to provide a reliable theoretical basis; third step, analysis of production conditions now have, whether they have HRBF500 Ⅳ grade steel development conditions, and the actual data analysis, up to not modified to the effect of the process after the process test. Practice has proved that through the production of fully capable of adding Nb microalloying elements V, Ti case, production in line with GB1499-2007 standard requirements of high-strength, low-cost, resource-saving high-speed wire rod of 500MPa ribbed steel. This is in line with the strategy of sustainable development and build a resource-saving society, and is conducive to the healthy and stable development of the iron and steel industry and the national economy, the project can greatly reduce the cost of production, with a larger market prospects in the construction industry with a wide range of application value .
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