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High Strength Cold Rolled Steel Sheet And Process For Manufacturing Same
Abstract: This high strength cold rolled steel sheet has: a composition which contains in mass% 0.075 to 0.300% of C 0.30 to 2.50% of Si 1.30 to 3.50% of Mn 0.001 to 0.050% of P 0.0001 to 0.0100% of S 0.001 to 1.500% of Al and 0.0001 to 0.0100% of N; a surface microstructure which comprises in volume fraction 3 to 10% of retained austenite and at most 90% of ferrite; and an internal microstructure which contains 3 to 20% of retained austenite in volume fraction. The internal microstructure is such observed at a depth of t/4 from the surface [wherein t is the thickness of the steel sheet]. Further the Hvs/Hvb ratio exceeds 0.75 and is up to 0.90 Hvs being the hardness in the surface layer of the steel sheet and Hvb is the hardness at a depth of t/4 from the surface. The maximum tensile strength of the high strength cold rolled steel sheet is 700MPa or higher.
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Notices, Deadlines & Correspondence
Notices, Deadlines & Correspondence
Patent Information
Application #
Filing Date
18 July 2014
Publication Number
36/2016
Publication Type
INA
Invention Field
MECHANICAL ENGINEERING
Status
Email
remfry-sagar@remfry.com
Parent Application
Patent Number
Legal Status
Grant Date
2021-12-20
Renewal Date
Applicants
NIPPON STEEL & SUMITOMO METAL CORPORATION
6 1 Marunouchi 2 chome Chiyoda ku Tokyo
1008071
Inventors
1. AZUMA Masafumi
c/o NIPPON STEEL & SUMITOMO METAL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo
1008071
2. NOZAKI Takayuki
c/o NIPPON STEEL & SUMITOMO METAL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo
1008071
3. WAKABAYASHI Chisato
c/o NIPPON STEEL & SUMITOMO METAL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo
1008071
4. SATO Koichi
c/o NIPPON STEEL & SUMITOMO METAL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo
1008071
5. KAWATA Hiroyuki
c/o NIPPON STEEL & SUMITOMO METAL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo
1008071
6. FUJITA Nobuhiro
c/o NIPPON STEEL & SUMITOMO METAL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo
1008071
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 6056-delnp-2014-Correspondence-Others-(21-07-2014).pdf | 2014-07-21 |
| 2 | PCT IB 304.pdf | 2014-07-23 |
| 3 | OTHER DOCUMENT.pdf | 2014-07-23 |
| 4 | FORM 5.pdf | 2014-07-23 |
| 5 | FORM 3.pdf | 2014-07-23 |
| 6 | FORM 2 + SPECIFICATION.pdf | 2014-07-23 |
| 7 | Copy of General Power of Authority -NIPPON.pdf | 2014-07-23 |
| 8 | 6056-DELNP-2014.pdf | 2014-07-26 |
| 9 | 6056-delnp-2014-English-Translation-(07-10-2014).pdf | 2014-10-07 |
| 10 | 6056-delnp-2014-Correspondence-Others-(07-10-2014).pdf | 2014-10-07 |
| 11 | 6056-delnp-2014-Form-3-(18-12-2014).pdf | 2014-12-18 |
| 12 | 6056-delnp-2014-Correspondence Others-(18-12-2014).pdf | 2014-12-18 |
| 13 | 6056-DELNP-2014-FER.pdf | 2019-01-28 |
| 14 | 6056-DELNP-2014-RELEVANT DOCUMENTS [15-07-2019(online)].pdf | 2019-07-15 |
| 15 | 6056-DELNP-2014-FORM 13 [15-07-2019(online)].pdf | 2019-07-15 |
| 16 | 6056-DELNP-2014-OTHERS [23-07-2019(online)].pdf | 2019-07-23 |
| 17 | 6056-DELNP-2014-FORM 3 [23-07-2019(online)].pdf | 2019-07-23 |
| 18 | 6056-DELNP-2014-FER_SER_REPLY [23-07-2019(online)].pdf | 2019-07-23 |
| 19 | 6056-DELNP-2014-CORRESPONDENCE [23-07-2019(online)].pdf | 2019-07-23 |
| 20 | 6056-DELNP-2014-COMPLETE SPECIFICATION [23-07-2019(online)].pdf | 2019-07-23 |
| 21 | 6056-DELNP-2014-CLAIMS [23-07-2019(online)].pdf | 2019-07-23 |
| 22 | 6056-DELNP-2014-ABSTRACT [23-07-2019(online)].pdf | 2019-07-23 |
| 23 | 6056-DELNP-2014-Power of Attorney-180719.pdf | 2019-07-24 |
| 24 | 6056-DELNP-2014-OTHERS-180719.pdf | 2019-07-24 |
| 25 | 6056-DELNP-2014-Correspondence-180719.pdf | 2019-07-24 |
| 26 | 6056-DELNP-2014-Power of Attorney-250719.pdf | 2019-08-02 |
| 27 | 6056-DELNP-2014-Correspondence-250719.pdf | 2019-08-02 |
| 28 | 6056-DELNP-2014-US(14)-HearingNotice-(HearingDate-25-11-2021).pdf | 2021-11-02 |
| 29 | 6056-DELNP-2014-Correspondence to notify the Controller [22-11-2021(online)].pdf | 2021-11-22 |
| 30 | 6056-DELNP-2014-FORM-26 [25-11-2021(online)].pdf | 2021-11-25 |
| 31 | 6056-DELNP-2014-Written submissions and relevant documents [09-12-2021(online)].pdf | 2021-12-09 |
| 32 | 6056-DELNP-2014-PETITION UNDER RULE 137 [09-12-2021(online)].pdf | 2021-12-09 |
| 33 | 6056-DELNP-2014-FORM 3 [09-12-2021(online)].pdf | 2021-12-09 |
| 34 | 6056-DELNP-2014-PatentCertificate20-12-2021.pdf | 2021-12-20 |
| 35 | 6056-DELNP-2014-IntimationOfGrant20-12-2021.pdf | 2021-12-20 |
| 36 | 6056-DELNP-2014-RELEVANT DOCUMENTS [30-08-2023(online)].pdf | 2023-08-30 |
Search Strategy
| 1 | SearchStrategy6056DELNP2014_23-08-2018.pdf |