MARAGING STEEL STRIP

WIPO Patent Application WO2010110379

A1

Provided is a maraging steel strip which has such a composition that can reduce the content of TiN acting as the starting point of fatigue fracture in a high-cycle region, and the bending fatigue strength of which has been improved by the precipitation hardening effect yielded by precipitating coherent nitrides in the nitrided structure. A maraging steel strip produced by nitriding a maraging steel which contains by mass, C: 0.01% or less, Si: 0.1% or less, Mn: 0.1% or less, P: 0.01% or less, S: 0.005% or less, Ni: 8.0 to 22.0%, Cr: 0.1 to 8.0%, Mo: 2.0 to 10.0%, Co: 2.0 to 20.0%, Ti: 0.1% or less, Al: 2.5% or less, N: 0.03% or less, and O: 0.005% or less, with the balance being Fe and unavoidable impurities, wherein Baker-Nutting orientation relationship with an orientation difference within 10° exists between the Cr nitride precipitated in the nitrided layer and the matrix martensite.

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OHISHI KATSUHIKO (JP)
UEHARA TOSHIHIRO (JP)

PCT/JP2010/055258

September 30, 2010

March 25, 2010

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HITACHI METALS LTD (JP)
OHISHI KATSUHIKO (JP)
UEHARA TOSHIHIRO (JP)

C22C38/00; C21D1/06; C22C38/52; C22C38/54; C23C8/26; C21D9/40

WO2009008071A1

2009-01-15

JP2001240943A	2001-09-04
JP2008185183A	2008-08-14
JP2006328486A	2006-12-07
JP2002302715A	2002-10-18
JP2004514056A	2004-05-13
JP2001240943A	2001-09-04
JP2002167652A	2002-06-11
JP2008088540A	2008-04-17
JP2007186780A	2007-07-26
JP2008185183A	2008-08-14

See also references of EP 2412836A4

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