Investigation of the mechanism of defect formation on reinforcements in multi-strain rolling with separation.

Abstract

In the production of rolled metal products, along with physical and mechanical properties, much attention is paid to the quality of the surface. Proper surface quality of rolled rebar provides not only the presentation of products, but also high performance properties of products ‒ long-term trouble-free operation of reinforced concrete structures. In order to increase production volumes and increase the productivity of mills, most manufacturers of rebar of small profiles No. 8‒22 use rolling with separation into several threads ‒ the slitting process. With the slitting process, most surface defects are formed near or in the thread separation area. The correct classification of defects and the establishment of the nature of their formation is a very important stage necessary for the analysis of production technology and the development of measures to improve product quality. The paper studies in detail the mechanism of formation of surface defects on reinforcement No. 12 of steel grade 25Mn2Si during rolling with separation into four threads.