High-strength hot dip galvannealed steel sheet having high powdering resistance and method for producing the same
US8025982B2 · kind B2 · utility
2Cited by
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20Claims
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Key dates
| Filing date | Dec 1, 2006 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Aug 21, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a high-strength hot dip galvannealed steel sheet having high powdering resistance produced by employing such a constitution that a Fe—Zn alloy plated layer is provided on at least one side of a basis steel sheet and a region in which Al (atomic %)/Zn (atomic %)≧0.10 is present in a thickness of 300 Å or more from the surface of the plated layer along the depth direction of the plated layer. Also disclosed is a hot dip galvannealed steel sheet whose formability is greatly improved by optionally specifying chemical composition and structure of the basis steel sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.