The Reduction of Edge Cracking Tendency for Cold Rolled High-carbon Steel

by Yuan-Tsung Wang

Publisher - China Steel Corporation

Category - General Novel

Edge cracking is the predominate surface defects in SK85 high carbon steel ([C]=0.85%) that may occur in cold-rolling operation. In this study, the simulation of shearing and rolling of high-carbon steel sheets is conducted to find out the dominant factors that may induce the initiation of edge cracking. The influence of the burr length and the morphology of sheared plane on the occurrence of edge cracking of cold rolling is investigated, and the related cracking mechanism at different reduction ratio is also discussed. The results indicate that the edge-cracking tendency of high carbon steel is closely related to the burr length and the surface roughness of sheared plane. The initial microcracks are observed to initiate from the burr areas near the bottom surface of the coiled steel after cold rolling. The higher the burr length and the reduction ratio are applied, the more serious the edge-cracking is obtained. In addition, the bulge regions at sheared plane will enhance the degree of edge creaking. Therefore, proper control of the burr length and morphology of sheared plane is essential to reduce the occurrence tendency of edge cracking in cold rolling.

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