Method of hot-rolled thin steel sheet with excellent formability and excellent strength and toughness after heat treatment
US8182621B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2011 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Oct 3, 2031 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/002
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of manufacturing a hot-rolled thin steel sheet includes: hot-rolling a steel base material having a composition containing, as mass %, C: 0.10 to 0.20%, Si: 0.01 to 1.0%, Mn: 0.5 to 2.0%, P: 0.03% or less, S: 0.01% or less, Al: 0.01 to 0.10%, N: 0.005% or less, Ti: 0.01 to 0.15%, B: 0.0005 to 0.0050%, the balance of Fe, and unavoidable impurities at a finishing temperature of finish rolling of 820 to 880° C. to produce a hot-rolled steel sheet with a thickness of less than 6 mm; cooling the hot-rolled steel sheet to a temperature range on a surface of the hot-rolled steel sheet to 550 to 650° C. at a surface cooling rate of 15 to 50° C. per second; and coiling the hot-rolled steel sheet at the temperature range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.