Research on the formation Reasons and Control Strategies of Edge Pitting Defects in Hot-rolled Pickled Plates
In response to the problem of edge pitting during the production of pickled plates on a 1580 mm hot rolling produc-tion line at Shougang,which affects the subsequent pickling quality,the causes and mechanisms of edge pitting defects were studied.Based on the morphology and location of defects,the control timing of the coiling machine equipment was compared to determine the equipment that causes edge pitting defects,and the different points of edge pitting defects on the upper and low-er surfaces were studied.The results indicate that the condition of the lower pinch roller surface has almost no effect on the edge pitting defects.The main reason for the occurrence of edge pitting defects on the upper surface is severe rust at the edge of the upper pinch roller,resulting in pitting.The main reason for the occurrence of surface pitting defects on the lower surface is severe rust on the edge of the frame roller under the clamping roller,resulting in pitting.To this end,relevant improvement measures have been proposed to effectively control edge defects and improve the quality of pickled board edges.
hot-rolled pickled platepitted surface defectscause of formation
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