Title:
FERRITIC STAINLESS STEEL WITH EXCELLENT CLAD SHEET WORKABILITY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/075283
Kind Code:
A1
Abstract:
The present invention relates to a ferritic stainless steel with excellent clad sheet workability, comprising, by wt%, 0.0005-0.02% of C, 0.005-0.02% of N, 0.01-1.0% of Si, 0.01-1.0% of Mn, 0.001-0.05% of P, 10.0-25.0% of Cr, 0.01-0.5% of Nb, 0.01-0.5% of Ti, and the balance of Fe and inevitable impurities, having an R-bar value, which is the average of R values for each direction, of 1.5 or more, and having a roughness height after sheet cladding of 25 μm or less. In addition, the present invention relates to a method for manufacturing a ferritic stainless steel with excellent clad sheet workability, comprising the steps of: manufacturing, through continuous casting, a slab comprising, by wt%, 0.0005-0.02% of C, 0.005-0.02% of N, 0.01-1.0% of Si, 0.01-1.0% of Mn, 0.001-0.05% of P, 10.0-25.0% of Cr, 0.01-0.5% of Nb, 0.01-0.5% of Ti, and the balance of Fe and inevitable impurities; hot rolling the manufactured slab at 800-1,250°C; hot annealing same at a temperature of 900-1,050°C, and then cold rolling same with a reduction ratio of 70% or more; and performing final cold annealing at a temperature of 800-950°C for less than one hour.
Inventors:
PARK JIEON (KR)
PARK MINAM (KR)
PARK MINAM (KR)
Application Number:
PCT/KR2022/015951
Publication Date:
May 04, 2023
Filing Date:
October 19, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/26; B23K20/00; C21D8/02; C21D9/46; C22C38/00; C22C38/28
Domestic Patent References:
| WO2021065738A1 | 2021-04-08 |
Foreign References:
| JP2020164956A | 2020-10-08 | |||
| KR101695758B1 | 2017-01-13 | |||
| CN109136735A | 2019-01-04 | |||
| JP2019123892A | 2019-07-25 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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