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Effect of Organic Lubricant Film on Various Properties of Galvannealed Steel Sheets  

김영근 (POSCO 기술연구소 소재연구그룹)
Publication Information
Journal of the Korean institute of surface engineering / v.36, no.2, 2003 , pp. 176-184 More about this Journal
Abstract
New lubricant film of organic and inorganic composite resin was developed to improve the press formability of galvannealed steel sheets (GA) for automotive body panels. The frictional coefficient of lubricant GA steel sheets is about 20% superior to that of uncoated GA. The current range of spot welding of lubricant GA is similar to that of the uncoated GA, but the burning trace of spot welding is inferior to that of the uncoated GA in the oiling condition. The alkaline degreasability of lubricant GA shows 100% in alkaline degreasing condition of automotive company. The size and shape of the phosphated coating layer are similar to those of the uncoated GA sheet. The powdering property of the lubricant GA gives rise to 20∼50% improved property compared with the uncoated GA sheet.
Keywords
Frictional coefficient; Weldability; Degreasability; Phosphating;
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