Title:
HOT-ROLLED FERRITIC STAINLESS STEEL SHEET HAVING EXCELLENT FORMABILITY AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/075391
Kind Code:
A1
Abstract:
The present invention pertains to a hot-rolled ferritic stainless steel sheet having excellent formability, which has an R-bar value of at least 1.08 and satisfies TS/YS≤1.5 representing the ratio of tensile strength (TS) to yield strength (YS) after a steel, containing 0.001-0.1% of C, 10.0-14.0% of Cr, 0.001-0.5% of Ti, 0.001-0.5% of Nb, 0.001-1.5% of Ni, 0.001-1.5% of Mn, 0.001-1.0% of Cu, 0.001-2.0% of Si, 0.001-0.1% of N, and 0.1% or less of Al, with the remainder comprising Fe and inevitable impurities, is hot-rolled and then pre-rolled at a reduction ratio of 30% or more. In addition, the present invention pertains to a method for manufacturing a hot-rolled ferritic stainless steel sheet having excellent formability, the method comprising the steps of: producing a slab by continuous casting a steel containing 0.001-0.1% of C, 10.0-14.0% of Cr, 0.001-0.5% of Ti, 0.001-0.5% of Nb, 0.001-1.5% of Ni, 0.001-1.5% of Mn, 0.001-1.0% of Cu, 0.001-2.0% of Si, 0.001-0.1% of N, and 0.1% or less of Al, with the remainder comprising Fe and inevitable impurities; reheating the produced slab; hot-rolling the reheated slab; pre-rolling the hot-rolled slab at a reduction ratio of 30% or more; and hot-annealing the pre-rolled slab.
Inventors:
KONG JUNGHYUN (KR)
KIM JINSUK (KR)
CHU NAYEON (KR)
KIM JINSUK (KR)
CHU NAYEON (KR)
Application Number:
PCT/KR2022/016420
Publication Date:
May 04, 2023
Filing Date:
October 26, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/50; C21D8/02; C21D9/46; C22C38/00; C22C38/42; C22C38/48
Foreign References:
| JP2001207244A | 2001-07-31 | |||
| KR20200032899A | 2020-03-27 | |||
| JP2001098327A | 2001-04-10 | |||
| US20210269890A1 | 2021-09-02 | |||
| JP2015196842A | 2015-11-09 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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