Influencing Factors and Formation Mechanism of Banded Red Scale Defect on Hot Rolled High Strength Steel Strip Surface for Mechanical Engineering Application
WANG Chang1, YU Yang1, PAN Hui1, WANG Lin1, CHEN Jin2, XU Hai-wei1
（1. Sheet Metal Research Dept.， Shougang Research Institute of Technology， Beijing 100043 2. Technology and Quality Division， Shougang Qian’an Steel Company， Qian’an 064404， Hebei， China
Abstract：Aiming at eliminating the banded red scale defect existing on the strip surface of high strength steel for mechanical engineering application, the microstructure of the cross section and surface at local defect position was observed through SEM and EPMA, and the uniformly-spaced characteristics related to the descaling system of hot rolling production line was studied. The results show that the scale thickness at the banded position is thicker than that of any other parts of the strip and there is a Si enrichment region between scale and strip. The correspondence of the spacing of banded scale and the spacing of the spray nozzles reveals that the existence of the banded scale defect is strongly related to the weak effectiveness of the finishing descaling process. The oxidization property of the given steel was analyzed through differential thermal analysis. The rapid growth of the scale thickness was found before the finishing descaling process in practice, and scale existing as Fe2SiO4 phase with strong adhesion ability leads to the difficulties of descaling process. Based on the study of the red scale formation mechanism, the control keys of hot rolling process and steelmaking have been proposed, which successfully removed the banded red scale defect.
收稿日期: 2013-11-15
出版日期: 2014-09-10
引用本文:
王 畅 于 洋 潘 辉 王 林 陈 瑾 徐海卫. 高强机械用钢表面条带状红铁皮产生原因及机制[J]. 钢铁, 2014, 49(9): 64-70.
WANG Chang, YU Yang, PAN Hui, WANG Lin, CHEN Jin, XU Hai-wei. Influencing Factors and Formation Mechanism of Banded Red Scale Defect on Hot Rolled High Strength Steel Strip Surface for Mechanical Engineering Application. Iron and Steel, 2014, 49(9): 64-70.
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2014, Vol. 49 
