Title:
STAINLESS STEEL PIPE WITH EXCELLENT EROSION RESISTANCE AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2014/098521
Kind Code:
A1
Abstract:
The present invention relates to a stainless steel pipe with excellent erosion resistance, which can improve erosion resistance in the inner area of the pipe while maintaining low-temperature toughness, and a manufacturing method thereof. The stainless steel pipe with excellent erosion resistance according to one embodiment of the present invention is a steel pipe including Cr at 11.0 to 14.0 wt% and having a ferrite factor (FF) of 6 to 9 as expressed by the following formula 1; and based on a thickness of the steel pipe, the inner area has a mixed phase structure of martensite and ferrite, the outer area has a single phase structure of ferrite or a mixed phase structure of ferrite and martensite, and a martensite fraction of the inner area is greater than a martensite fraction of the outer area: [Formula 1] FF = [Cr + 6Si +8Ti + 4Mo + 2Al +4Nb] - [2Mn + 4Ni + 40(C+N)] wherein Cr, Si, Ti, Mo, Al, Nb, Mn, Ni, C and N represent contents (wt%) of respective ingredients.
Inventors:
KIM KWANG YUK (KR)
AHN DEOK CHAN (KR)
CHAE DONG CHUL (KR)
AHN DEOK CHAN (KR)
CHAE DONG CHUL (KR)
Application Number:
PCT/KR2013/011959
Publication Date:
June 26, 2014
Filing Date:
December 20, 2013
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/00; C21D6/00; C22C38/58
Foreign References:
| KR100930733B1 | 2009-12-09 | |||
| KR20100056385A | 2010-05-27 | |||
| JP3733884B2 | 2006-01-11 | |||
| JP3206367B2 | 2001-09-10 | |||
| JPH08295934A | 1996-11-12 |
Attorney, Agent or Firm:
SHINSEGI PATENT LAW FIRM (Seolleung-roGangnam-gu, Seoul 135-832, KR)
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