Method for preparing galvanized steel strip having minimal uncoated defects
US5433796A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1993 |
| Grant date | Jul 18, 1995 |
| Priority date | — |
| Expiry date | Aug 2, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/06
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In the preparation of a galvanized steel strip by continuously heating and anneal reducing a steel strip and subsequently admitting it, without contact with the ambient air, into a molten zinc bath to coat the strip with zinc, there is provided a method for preparing a galvanized or galvannealed steel strip having minimal uncoated defects, characterized in that a steel strip having a composition which contains PA1 up to 0.1% by weight of C, PA1 0.01 to 1.0% by weight of Si, PA1 0.05 to 2.0% by weight of Mn, and PA1 up to 0.15% by weight of P, and satisfies the following formula (1): EQU Si/28+Mn/55+P/31.gtoreq.0.01 (1) wherein the element symbols represent the contents in % by weight of the respective elements in the steel strip is used as the starting strip to be galvanized, and the steel strip is subjected to carburizing treatment during the anneal reducing step or before the anneal reduced steel strip is admitted into the molten zinc bath.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.