Study On The Edge Folding Defect Of Low-carbon Steel

This paper mainly studies the edge folding defects of Hot Strip.In the rolling process, there are many shear zones in the edge of the side surface owing to the plastic instability.The shear zones are transferred to upper and lower surfaces into folding defects after the process of multi-pass lateral spread and metal particle flow. There are many articles which unilaterally study the edge folding defects,plastic instability, the lateral spread or metal particle flow in domestic and foreign researches, but almost no articles combine them to explore the forming mechanism of the edge folding defects.The content contains using the ABAQUS software to simulate the single-pass rough rolling process basic on the process parameters of production site, calculating the thickness of plate corresponding to the critical reduction of the plastic instability through changing the entrance thickness and reduction, drawing the graphic of the critical instability region,and analysising whether the vertical edger and rolling with tension impact the plastic instability in rough rolling process.The plastic instability of the plate is the main internal mechanism of the edge folding defects, we must control strictly every pass reduction of the rough rolling so that it’s within the region of the plastic instability; In the finishing rolling process, the entrance thickness and reduction distribution program affect the sum of the drum-shaped and turned flat spread, which will determine the loss of edge scrap while the plate occurred the edge folding defects, so we must minimize the entrance thickness as much as possible and develop a reasonable reduction distribution program.