Alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability and method for manufacturing same
US5629099A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1994 |
| Grant date | May 13, 1997 |
| Priority date | — |
| Expiry date | Dec 19, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12993
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An alloying-treated iron-zinc alloy dip-plated steel sheet excellent in press-formability, having, on the surface thereof, numerous fine concavities which satisfy the following conditions: (1) that the number of fine concavities having a depth of at least 2 .mu.m is within a range of from 200 to 8,200 per mm.sup.2 of the plating layer, and (2) that the total opening area per unit area of the fine concavities in the plating layer is within a range of from 10 to 70% of the unit area. The above-mentioned plated steel sheet is manufactured by subjecting a cold-rolled steel sheet to a zinc dip-plating treatment in a zinc dip-plating bath having an aluminum content of from 0.05 to 0.30 wt. %, in which the temperature region causing an initial reaction for forming an iron-aluminum layer is limited within a range of from 500.degree. to 600.degree. C., an alloying treatment in which an alloying treatment temperature is limited within a range of from 480.degree. to 600.degree. C., and a temper-rolling treatment. It is possible to further impart an excellent image clarity after painting to the above-mentioned plated steel sheet by replacing the above-mentioned condition (2) with a condition t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.