Research on Surface Defect Control Technology for Advanced High Strength Hot Dip Galvanized Automobile Sheet

CHU Shuang - jie, TANG Wen - jie, LIANG Gao - fei, QIAN Hong - wei

doi:10.16577/j.issn.1001-1560.2022.0231

Materials Protection >

2022 , Vol. 55 >Issue 8: 166 - 170

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0231

Research on Surface Defect Control Technology for Advanced High Strength Hot Dip Galvanized Automobile Sheet

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(Baoshan Iron and Steel Co., Ltd., Shanghai 201900, China)

Received date: 2022-02-18

Revised date: 2022-03-08

Accepted date: 2022-03-31

Online published: 2023-12-17

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Abstract

For expanding the application in the automotive field, the surface defect control technology for advanced high strength hot dip galvanized automobile sheet was studied. Results showed that the oxygen potential of alloy element was lower than that of Fe during hot rolling, annealing and hot galvanizing processes, resulting in an “internal oxidation” phenomenon, which made defects easily to occur on the surface of galvanized products. Focusing on such four main surface defects as iron leakage, chicken claw print, color difference and pockmarked surface, the main factors causing the defects and the mechanisms for the formation of defects were determined. Through the measure of corresponding production control processes, the commuted rates of defects declined to below 0.58%, 0.19%, 0.52% and 0.15% respectively.

Key words： advanced high strength steel; automobile sheet; hot dip galvanized; surface defect

Cite this article

CHU Shuang - jie, TANG Wen - jie, LIANG Gao - fei, QIAN Hong - wei . Research on Surface Defect Control Technology for Advanced High Strength Hot Dip Galvanized Automobile Sheet[J]. Materials Protection, 2022 , 55(8) : 166 -170 . DOI: 10.16577/j.issn.1001-1560.2022.0231

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