Hot-dip coating method in a zinc bath for strips of iron/carbon/manganese steel
US7556865B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2005 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Oct 10, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12799
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The subject of the invention is a method for the hot-dip coating, in a liquid bath based on zinc containing aluminum, of a running strip of iron-carbon-manganese austenitic steel, in which said strip is subjected to a heat treatment in a furnace in which an atmosphere that is reducing with respect to iron prevails, in order to obtain a strip covered with a thin manganese oxide layer, and then the strip covered with the thin manganese oxide layer is made to run through said bath, the aluminum content in the bath being adjusted to a value at least equal to the content needed for the aluminum to completely reduce the manganese oxide layer, so as to form, on the surface of the strip, a coating comprising an iron-manganese-zinc alloy layer and a zinc surface layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.