Transactions of Materials and Heat Treatment

Title：Analysis on reasons of surface chromatism for cold-rolled thin sheet

Authors： Wu Shengjie Liu Xinyuan Zhao Gang Zhao Qishao Li Hualong

Unit： Institute of Research of Iron and Steel Sha-Steel Zhangjiagang Yangtze River Cold Rolled Plate Jiangsu Sha-Steel Group Co. Ltd.

KeyWords： cold-rolled thin sheet chromatism roughness emulsion lubrication

ClassificationCode：TG142.71

year,vol(issue):pagenumber：2017,42(7):147-152

Abstract：

The surface chromatism of cold-rolled thin sheet was observed by real color confocal scanning microscope, and the non-uniform roughness on the surface of sheet resulted in linear chromatism. The texture of chromatism was featured by continuity in the welding zone between two coils. And it is found that the chromatism is caused by the fifth stand of the tandem cold rolling mill after taking samples during emergent braking. The analysis result indicates that the non-uniform roughness of sheet correlates to the uneven distribution of emulsion oil film, which relates to spray method of emulsion, rolling speed, and granularity and contact angle of oil droplets during the cold rolling process. Thus, the rolling speed is controlled by adding auxiliary spray nozzles of emulsion, and the granularity of oil droplets decreases from 13 μm to 8 μm as well as the contract angle of oil droplets decreases from 80° to 63°. Thus, the problem of chromatism is resolved.

Funds：

作者简介：吴圣杰（1986-），男，硕士，工程师，E-mail：shengjiewu@126.com

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