Galvannealed steel sheet and method for manufacturing the same
US6699592B2 · kind B2 · utility
2Cited by
1References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2002 |
| Grant date | Mar 2, 2004 |
| Priority date | — |
| Expiry date | Oct 21, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12993
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention provides a galvannealed steel sheet which has an oxide layer having 10 nm or larger thickness on the plateau of the coating layer flattened by temper rolling. With the use of the galvannealed steel sheet, no powdering occurs during press-forming, and stable and excellent sliding performance is attained. By selecting the area percentage of the plateau of the flattened coating layer to a range from 20 to 80%, making the coating layer single layer of &dgr;1 phase, and letting &zgr; phase exist in the &dgr;1 phase, further improved sliding performance and anti-powdering property are obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.