MARAGING STEEL - HITACHI METALS LTD

Title:

MARAGING STEEL

Document Type and Number:

WIPO Patent Application WO/2013/047078

Kind Code:

A1

Abstract:

Provided is a maraging steel with which maraging steel that has been subjected to nitriding treatment has excellent fatigue strength and stable high strength. Maraging steel that has been subjected to nitriding treatment to a thickness of 0.5 mm or less and comprises, by mass%, 0.008% or less of C, 0.5% or less of Si, 0.5% or less of Mn, 0.5 to 1.5% of Cr, 16.0 to 22.0% of Ni, 3.0 to 7.0% of Co, and 3.0 to 7.0% of Mo is a maraging steel further comprising, by mass%, 0.6 to 1.3% of Al and Fe and impurities as the balance, wherein the impurities are maintained at 0.01% or less of Ti, 0.01% or less of Nb, 0.01% or less of Ta, and 0.01% or less of W, the ratio of Al and Ti is Al/Ti > 250, and by Vickers hardness, the surface hardness of the maraging steel is 800 to 1,050 HV and internal hardness of the maraging steel is 570 HV or less.

Inventors:

OHISHI KATSUHIKO (JP)
UEHARA TOSHIHIRO (JP)
KISHIGAMI ICHIRO (JP)

Application Number:

PCT/JP2012/072010

Publication Date:

April 04, 2013

Filing Date:

August 30, 2012

Export Citation:

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Assignee:

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

International Classes:

C22C38/52; C22C38/00; C22C38/54; C23C8/26

Domestic Patent References:

WO2010110379A1	2010-09-30
WO2009008071A1	2009-01-15

Foreign References:

JP2001240944A	2001-09-04
JP2001240943A	2001-09-04
JP2002275585A	2002-09-25
JP2009013464A	2009-01-22
JP2008088540A	2008-04-17
JP2007186780A	2007-07-26
JP2001240943A	2001-09-04
JP2001240944A	2001-09-04

Other References: