Process of making a high strength cold reduced steel sheet having high bake-hardenability and excellent non-aging property
US4050959A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1975 |
| Grant date | Sep 27, 1977 |
| Priority date | — |
| Expiry date | Nov 14, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D9/52
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
When a cold reduced steel of which chemical composition is substantially controlled within the range of 10x[S]% to 2.00% [Mn], 0.003 to 0.02% [N] and (<5.times.10.sup.31 4)/[N]% [Al] is subjected to a full continuous annealing process comprising a heating-up step of Ac.sub.1 to 900.degree. C .times. 5 to 180 sec., a rapid cooling step of the heating-up temperature to about room temperature by water-spray, reheating step of the room temperature to 150.degree. C to 450.degree. C .times. 5 to 300 sec., and then final cooling- and coiling step, high bake-hardenability and excellent non-aging property are given to the above steel with ease.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.