Galvannealed steel sheets exhibiting excellent press die sliding property
US5324594A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Oct 28, 1992 |
| Grant date | Jun 28, 1994 |
| Priority date | — |
| Expiry date | Oct 28, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12993
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In a hot-dip zinc-coated steel sheet exhibiting excellent press die sliding characteristics and obtained by performing a molten galvanization and then skin pass rolling on a surface of the steel sheet, a galvanized layer has a three-dimensional average surface roughness ranging from 0.7 .mu.m to 1.4 .mu.m, and a skewness (S) of the amplitude probability distribution of the surface roughness, which is defined by the following equation (1), ranging from 0.1 to -0.3: EQU S=.mu..sub.3 /.sigma..sup.3 (1) where PA0 .mu..sub.3 : Three-dimensional moment of the amplitude probability density PA0 .sigma.: Standard deviation of the amplitude probability density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.