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High Strength Hot Dip Galvanized Steel Sheet Having Excellent Surface Quality And Electric Resistance Spot Weldability, And Manufacturing Method Therefor
Abstract: The present invention relates to a high-strength hot-dip galvanized steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefor. A hot-dip galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a hot-dip galvanized layer formed on the surface of the base steel sheet, wherein the difference between the average of the Mn/Si values of surface oxides present on a surface part, which is the region from the interface between the hot-dip galvanized layer and the base steel sheet to a depth of 15 nm, and the average of the Mn/Si values of internal oxides, which are present in the region from the interface to a depth of 50-100 nm, can be 0.5 or more. Mn and Si of each oxide mean the amounts (wt%) of Mn and Si components in the oxide, which are measured by EDS, and the average of Mn/Si values means the averaged value of the Mn/Si values measured for each oxide.
Notices, Deadlines & Correspondence
Patent Information
Applicants
POSCO CO., LTD
Inventors
1. KANG, Ki-Cheol
2. KIM, Tae-Chul
3. KIM, Myung-Soo
4. KIM, Jong-Sang
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 202317045132-STATEMENT OF UNDERTAKING (FORM 3) [05-07-2023(online)].pdf | 2023-07-05 |
| 2 | 202317045132-REQUEST FOR EXAMINATION (FORM-18) [05-07-2023(online)].pdf | 2023-07-05 |
| 3 | 202317045132-PROOF OF RIGHT [05-07-2023(online)].pdf | 2023-07-05 |
| 4 | 202317045132-PRIORITY DOCUMENTS [05-07-2023(online)].pdf | 2023-07-05 |
| 5 | 202317045132-POWER OF AUTHORITY [05-07-2023(online)].pdf | 2023-07-05 |
| 6 | 202317045132-NOTIFICATION OF INT. APPLN. NO. & FILING DATE (PCT-RO-105-PCT Pamphlet) [05-07-2023(online)].pdf | 2023-07-05 |
| 7 | 202317045132-FORM 18 [05-07-2023(online)].pdf | 2023-07-05 |
| 8 | 202317045132-FORM 1 [05-07-2023(online)].pdf | 2023-07-05 |
| 9 | 202317045132-FIGURE OF ABSTRACT [05-07-2023(online)].pdf | 2023-07-05 |
| 10 | 202317045132-DECLARATION OF INVENTORSHIP (FORM 5) [05-07-2023(online)].pdf | 2023-07-05 |
| 11 | 202317045132-COMPLETE SPECIFICATION [05-07-2023(online)].pdf | 2023-07-05 |
| 12 | 202317045132-FORM-26 [07-08-2023(online)].pdf | 2023-08-07 |
| 13 | 202317045132-Others-100823.pdf | 2023-10-03 |
| 14 | 202317045132-GPA-100823.pdf | 2023-10-03 |
| 15 | 202317045132-Correspondence-100823.pdf | 2023-10-03 |
| 16 | 202317045132-FORM 3 [05-12-2023(online)].pdf | 2023-12-05 |