Method of manufacturing a low-alloy ultra-low-carbon cold anisotropy rolled steel sheet exhibiting an excellent resistance to fabrication embrittlement and small internal anisotropy
US5460665A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1994 |
| Grant date | Oct 24, 1995 |
| Priority date | — |
| Expiry date | Oct 11, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/0473
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of manufacturing a cold rolled steel sheet includes the steps of preparing, as a material, a steel whose composition consists of C: 0.004 wt % or less, Si: 0.10 wt % or less, Mn: 0.50 wt % or less, Ti: between 0.01 wt % and 0.10 wt %, Nb: between 0.003 wt % and 0.03 wt %, B: between 0.001 wt % and 0.004 wt %, Al: between 0.03 wt % and 0.10 wt %, P: 0.025 wt % or less, S: 0.01 wt % or less, N: 0.006 wt % or less; performing a hot rolling on the material steel under the conditions of a finishing temperature between 800.degree. C. and 900.degree. C.; coiling the material at a temperature lower than 650.degree. C.; performing a cold rolling; performing a continuous annealing at a temperature between 830.degree. C. and Ac.sub.3 transformation point; and performing a skin pass rolling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.