TWO-PHASE STAINLESS STEEL - NIPPON STEEL & SUMITOMO METAL CORP

Title:

TWO-PHASE STAINLESS STEEL

Document Type and Number:

WIPO Patent Application WO/2013/035588

Kind Code:

A1

Abstract:

Provided is a two-phase stainless steel which has high strength, also has excellent SCC resistance and SSC resistance in a high-temperature chloride environment, and does not undergo the precipitation of a sigma phase. A two-phase stainless steel according to an embodiment of the present invention contains, in mass%, 0.03% or less of C, 0.2 to 1% of Si, more than 5.0% and 10% or less of Mn, 0.040% or less of P, 0.010% or less of S, 4.5 to 8% of Ni, 0.040% or less of sol. Al, more than 0.2% and 0.4% or less of N, 24 to 29% of Cr, 0.5% or more and less than 1.5% of Mo, 1.5 to 3.5% of Cu, 0.05 to 0.2% of W and a remainder made up by Fe and impurities, wherein a requirement represented by formula (1) is fulfilled. Cr+8Ni+Cu+Mo+W/2 ≥ 65 (1) To each element symbol in formula (1), a value of the content (mass%) of the corresponding element is assigned.

Inventors:

TAKABE HIDEKI (JP)
AMAYA HISASHI (JP)
OGAWA KAZUHIRO (JP)

Application Number:

PCT/JP2012/071725

Publication Date:

March 14, 2013

Filing Date:

August 28, 2012

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)
TAKABE HIDEKI (JP)
AMAYA HISASHI (JP)
OGAWA KAZUHIRO (JP)

International Classes:

C22C38/00; C22C38/58; C21D6/00; C21D9/08; C21D9/50

Foreign References:

JPS5433216A	1979-03-10
JPS5071509A	1975-06-13
JPS52124411A	1977-10-19
JPH09202944A	1997-08-05
JPS52137763A	1977-11-17
JP2003171743A	2003-06-20
JPH05132741A	1993-05-28

Other References: