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| Combination Effect of Si and P on Tertiary Scale Characteristic of Hot Rolled Strip |
| Yang YU1,Chang WANG1,Lin WANG1,Jin CHEN2,Ya-jun HUI1,Chang-ku SUN1 |
1. Sheet Metal Research Institute, Shougang Research Institute of Technology, Beijing 100043, China
2. Department of Technology and Quality, Shougang Qian��an Iron and Steel Co., Ltd., Qian��an 064404, Hebei, China |
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Abstract For high strength interstitial free (IF) steel containing P element, the salt and pepper (SP) defects exist on the strip surface and could not be eliminated effectively by optimizing the hot rolling process, such as temperature and cooling water. The combination effect of Si and P on the characteristic of tertiary scale has been studied comprehensively by scanning electron microscopy (SEM) and electron probe microanalysis (EPMA), and the concept is proposed firstly that Si and P are of combination effect which can be utilized to eliminate the SP defect. The results show that the SP defects were induced by the rolled-in scale during finish rolling. P can be enriched at the interface between substrate and tertiary scale, which is easy to decrease the adhesion of tertiary scale. However, Si enrichment at the interface between substrate and tertiary scale can increase the adhesion. The SP defects can be eliminated completely, which is attributed to the accompanying enrichment of Si and P.
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Received: 05 December 2013
Published: 06 March 2015
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Corresponding Authors:
Yang YU
E-mail: yyhpd@163.com
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2015, Vol. 22 
