Title:
FERRITIC STAINLESS STEEL HAVING IMPROVED PIPE-EXPANDING WORKABILITY AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/124690
Kind Code:
A1
Abstract:
Disclosed is ferritic stainless steel having improved pipe-expanding workability for an automotive exhaust system component. Ferritic stainless steel according to one embodiment of the present invention, comprises in percentage by weight : 10 to 25% of Cr; 0.015% or less of N (excluding 0); 0.005 to 0.04% of Al; 0.1 to 0.6% of Nb; 0.1 to 0.5% of Ti; and the balance being Fe and other inevitable impurities, and satisfies following equation (1): Z = X*Y ≥ 17 (1) (where, on the basis of the thickness T of the ferritic stainless steel, X means [(111) // ND texture fraction / [(100) // ND texture fraction] in a region from T/3 to 2T/3, and Y means 10 * [(100) // ND texture fraction] / [(111) // ND texture fraction] in a region from the surface layer to T/3.
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Inventors:
JUNG IL CHAN (KR)
SEO YOUNG MIN (KR)
AHN DEOK CHAN (KR)
SEO YOUNG MIN (KR)
AHN DEOK CHAN (KR)
Application Number:
PCT/KR2018/011764
Publication Date:
June 27, 2019
Filing Date:
October 05, 2018
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/26; C21D8/10; C22C38/00; C22C38/28
Foreign References:
| JP2001294991A | 2001-10-26 | |||
| JPH11323502A | 1999-11-26 | |||
| KR20150110762A | 2015-10-02 | |||
| JP2002194505A | 2002-07-10 | |||
| JP2005194572A | 2005-07-21 | |||
| JP2016156072A | 2016-09-01 |
Other References:
See also references of EP 3699311A4
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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