Title:
LOW-CR FERRITIC STAINLESS STEEL HAVING IMPROVED PIPE EXPANSION WORKABILITY, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2021/054587
Kind Code:
A1
Abstract:
Disclosed is a low-Cr ferritic stainless steel having improved pipe expansion workability. The disclosed ferritic stainless steel comprises at most 0.01 wt% of C (exclusive of 0), at most 0.01 wt% of N (exclusive of 0), 1.0-2.0 wt% of Si, at most 0.5 wt% of Mn (exclusive of 0), 9.0-15.0 wt% of Cr, 0.1-0.5 wt% of Ti, 0.05-0.2 wt% of Sn, at most 1.0 wt% of Cu (exclusive of 0), at most 0.035 wt% of P (exclusive of 0), and at most 0.01 wt% of S (exclusive of 0), with the balance being Fe and inevitable impurities, has a ratio (Gs/Gc) of the average grain size (Gs) in a region corresponding to a depth of at most 100 μm from the surface to the average grain size (Gc) in a central region of at most 1.5, and satisfies the following expression (1). Expression (1): Cr+3Si+10Sn+2Cu ≥ 17 (where, Cr, Si, Sn, and Cu indicate the content (wt%) of each element.)
Inventors:
RYU HANJIN (KR)
JUNG ILCHAN (KR)
KIM HOIHUN (KR)
JUNG ILCHAN (KR)
KIM HOIHUN (KR)
Application Number:
PCT/KR2020/008946
Publication Date:
March 25, 2021
Filing Date:
July 08, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/34; C21D9/08; C22C38/20
Foreign References:
| KR20140082347A | 2014-07-02 | |||
| KR20190074757A | 2019-06-28 | |||
| KR101706004B1 | 2017-02-10 | |||
| KR101676193B1 | 2016-11-15 | |||
| JP2003213376A | 2003-07-30 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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