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Steel Sheet And Method For Producing Same
Abstract: The present invention provides a steel sheet which has a predetermined chemical composition, wherein the steel structure thereof contains, in volume%, from 1% to 50% of ferrite with the proportion of non-recrystallized ferrite in the ferrite being from 0% to 50%, 1% or more of tempered martensite, 5% or more of residual austenite, from 0% to 10% of fresh martensite, and a total of from 0% to 5% of pearlite and cementite, with the balance being made up of bainite. If the surface of this steel sheet is subjected to EPMA analysis, the area ratio of the region where the AlS/SiS ratio is 0.2 or less is 50% or less, and the tensile strength is 980 MPa or more. The present invention also provides a method for producing this steel sheet.
Notices, Deadlines & Correspondence
Patent Information
Applicants
NIPPON STEEL CORPORATION
Inventors
1. YOKOYAMA, Takafumi
2. TSUNEMI, Yusuke
3. OBUCHI, Tatsuya
4. MINAMI, Akinobu
5. KUWAYAMA, Takuya
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 202317030287-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [27-04-2023(online)].pdf | 2023-04-27 |
| 2 | 202317030287-STATEMENT OF UNDERTAKING (FORM 3) [27-04-2023(online)].pdf | 2023-04-27 |
| 3 | 202317030287-REQUEST FOR EXAMINATION (FORM-18) [27-04-2023(online)].pdf | 2023-04-27 |
| 4 | 202317030287-PROOF OF RIGHT [27-04-2023(online)].pdf | 2023-04-27 |
| 5 | 202317030287-PRIORITY DOCUMENTS [27-04-2023(online)].pdf | 2023-04-27 |
| 6 | 202317030287-POWER OF AUTHORITY [27-04-2023(online)].pdf | 2023-04-27 |
| 7 | 202317030287-FORM 18 [27-04-2023(online)].pdf | 2023-04-27 |
| 8 | 202317030287-FORM 1 [27-04-2023(online)].pdf | 2023-04-27 |
| 9 | 202317030287-DECLARATION OF INVENTORSHIP (FORM 5) [27-04-2023(online)].pdf | 2023-04-27 |
| 10 | 202317030287-COMPLETE SPECIFICATION [27-04-2023(online)].pdf | 2023-04-27 |
| 11 | 202317030287.pdf | 2023-05-03 |
| 12 | 202317030287-FORM 3 [27-07-2023(online)].pdf | 2023-07-27 |
| 13 | 202317030287-FER.pdf | 2025-10-16 |
Search Strategy
| 1 | 202317030287_SearchStrategyNew_E_SearchStrategy91H202317030287E_15-10-2025.pdf |