Galvanized steel sheet superior in ductility and process for production thereof
US6316127A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Apr 20, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12799
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A P- and Ti-added galvannealed steel sheet superior in ductility, and a process for production thereof. It is made of a cold-rolled steel sheet and has alloyed hot-dip galvanizing on the surface thereof, said cold-rolled steel sheet having the chemical composition (in terms of wt %) of C: less than 0.010%, Si: no more than 0.5%, Mn: 1.0.about.3.0%, P: no more than 0.20%, S: no more than 0.01%, Al: 0.005.about.0.10%, N: no more than 0.0050%, Ti/48-(C/12+N/14+S/32): 0.0003.about.0.0018 with the remainder being chiefly Fe, and said cold-rolled steel sheet being characterized by .rho.1.ltoreq.10.sup.7 and .rho.2.ltoreq.5.times.10.sup.5, where .rho.1 is the number of precipitates whose particle diameter (D) is in the range of 10 nm.ltoreq.D<100 nm and .rho.2 is the number of precipitates whose particle diameter (D) is in the range of 100 nm.ltoreq.D.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.