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| Mechanisms on formation of different kinds of surface defects in hot- rolled SPA- H steel |
| SHAO Xiao- jing 1,2,JI Chen- xi1,GAO Xiao- li1,LIU Kun1,REN Qun1,CUI Yang1 |
（1. Sheet Metal Research Institute, Shougang Research Institute of Technology, Beijing 100043, China
2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology, Beijing 100043, China） |
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Abstract The formation mechanism of surface defects, including the independent linear defect, independent tarpaulin defect, the mixture of linear and tarpaulin defect, and the shallow pit defect on the hot rolled SPA- H coil in Shougang Company was studied. The morphologies of defects and microstructures were examined using metallographic microscope, scanning electron microscope and energy dispersive spectrometer. It was concluded that the formation of both linear and tarpaulin defects and their mixture should be closely related to the two factors: Oxide scale that contains both silicon oxide and chromium oxide; The copper enrichment in the oxide scale near the steel matrix. The shallow pit results from the debris of broken tarpaulin which was rolled into the steel during the finish rolling.
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Received: 17 July 2017
Published: 13 March 2018
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2018, Vol. 28 
