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Hot Rolled Steel Sheet And Manufacturing Method Therefor
Abstract: A hot-rolled steel sheet and a manufacturing method therefor are provided. The hot-rolled steel sheet of the present invention includes, by wt%, 0.020-0.080% of C, 0.01-0.50% of Si, 0.8-1.8% of Mn, 0.010-0.100% of Al, 0.001-0.020% of P, 0.001-0.010% of S, 0.001-0.010% of N, 0.010-0.120% of Ti, 0.010-0.050% of Nb, and the remainder of Fe and inevitable impurities, satisfies an X value of 3.50-6.00 as defined by equation 1, and has a micro-structure in which the sum of ferrite and bainite phases is at least 90 area% and the sum of the remaining martensite and MA phases is less than 10 area%.
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Notices, Deadlines & Correspondence
Notices, Deadlines & Correspondence
Patent Information
Application #
Filing Date
23 June 2025
Publication Number
27/2025
Publication Type
INA
Invention Field
METALLURGY
Status
Email
Parent Application
Applicants
POSCO CO., LTD
6261, Donghaean-ro, Nam-gu,
Pohang-si,
Gyeongsangbuk-do 37859
Inventors
1. LEE, Je-Woong
20-26, Pokposarang-gil
Gwangyang-si,
Jeollanam-do 57807
2. KIM, Sung-Il
20-26, Pokposarang-gil
Gwangyang-si,
Jeollanam-do 57807
3. YI, Il-Cheol
20-26, Pokposarang-gil
Gwangyang-si,
Jeollanam-do 57807
4. NA, Hyun-Taek
20-26, Pokposarang-gil
Gwangyang-si,
Jeollanam-do 57807
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 202517059939-STATEMENT OF UNDERTAKING (FORM 3) [23-06-2025(online)].pdf | 2025-06-23 |
| 2 | 202517059939-REQUEST FOR EXAMINATION (FORM-18) [23-06-2025(online)].pdf | 2025-06-23 |
| 3 | 202517059939-PROOF OF RIGHT [23-06-2025(online)].pdf | 2025-06-23 |
| 4 | 202517059939-PRIORITY DOCUMENTS [23-06-2025(online)].pdf | 2025-06-23 |
| 5 | 202517059939-POWER OF AUTHORITY [23-06-2025(online)].pdf | 2025-06-23 |
| 6 | 202517059939-NOTIFICATION OF INT. APPLN. NO. & FILING DATE (PCT-RO-105-PCT Pamphlet) [23-06-2025(online)].pdf | 2025-06-23 |
| 7 | 202517059939-FORM 18 [23-06-2025(online)].pdf | 2025-06-23 |
| 8 | 202517059939-FORM 1 [23-06-2025(online)].pdf | 2025-06-23 |
| 9 | 202517059939-FIGURE OF ABSTRACT [23-06-2025(online)].pdf | 2025-06-23 |
| 10 | 202517059939-DRAWINGS [23-06-2025(online)].pdf | 2025-06-23 |
| 11 | 202517059939-DECLARATION OF INVENTORSHIP (FORM 5) [23-06-2025(online)].pdf | 2025-06-23 |
| 12 | 202517059939-COMPLETE SPECIFICATION [23-06-2025(online)].pdf | 2025-06-23 |
| 13 | 202517059939-certified copy of translation [25-06-2025(online)].pdf | 2025-06-25 |
| 14 | 202517059939-FORM-26 [23-09-2025(online)].pdf | 2025-09-23 |