Analysis and control of coarse surface of galvanized dual phase steel

LI Xing

doi:10.13228/j.boyuan.issn0449-749x.20160419

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Iron and Steel ›› 2017, Vol. 52 ›› Issue (6) : 94-100. DOI: 10.13228/j.boyuan.issn0449-749x.20160419

Analysis and control of coarse surface of galvanized dual phase steel

LI Xing

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Abstract

Hot dip galvanized steel with high strength such as DP （dual phase） steel has been widely produced. During the galvanizing process of DP steel， coarse surface defect isfound on the surface of the zinc layer which causes severe colour difference between the edge and the middle of the strip. Coarse surface defect has very bad effect on the surface quality of the galvanized strip. The abnormal increasement of the roughness， the uneven zinc layer， the low-quality inhibition layer and the microcrack on the substrate surface are always in company with the coarse surface defect. The microcrack on the substrate surface is considered to be the main reason of the coarse surface defect of the DP steel. The microstructure of the hot rolled strip and the reduction ratio of the cold rolling process are the key factors to determine the microcrack on the substrate surface. The formation of the microcrack on the substrate surface can be eliminated by optimizing the microstructure of the hot rolled strip and reducing the reduction ratio of the cold rolling process and the coarse surface problem can be solved effectively.

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LI Xing. Analysis and control of coarse surface of galvanized dual phase steel[J]. Iron and Steel, 2017, 52(6): 94-100 https://doi.org/10.13228/j.boyuan.issn0449-749x.20160419

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