Title:
MARTENSITE STEEL
Document Type and Number:
WIPO Patent Application WO/2014/156327
Kind Code:
A1
Abstract:
Provided is a martensite steel which can be imparted with ductility while maintaining excellent strength properties thereof, i.e., a martensite steel which can have both strength and ductility.
A martensite steel having a chemical composition containing, in mass%, 0.18 to 0.30% of C, and 1.0 to 2% of Al and 0.3% or less of V, 2.0 to 5.0% of Cr, 10.5 to 15.0% of Ni wherein Ni ≥ 7.0+3.5Al, also containing 5.0 to 7.0% of Co, 1.0 to 4.0% of Mo alone or Mo+W/2, selected elements B, Si, Mn, Ca, a rare earth element, Cu and Nb wherein B is contained in an amount of 0.0050% or less, Si is contained in an amount of 0.4% or less, Mn is contained in an amount of 0.4% or less, Ca is contained in an amount of 0.05% or less, the rare earth element is contained in an amount of 0.05% or less, Cu is contained in an amount of 1.0% or less and Nb is contained in an amount of 0.1% or less, with the remainder made up by Fe and impurities. The martensite steel additionally contains Mg in an amount of 40 ppm or less (excluding 0%).
Inventors:
OISHI KATSUHIKO (JP)
Application Number:
PCT/JP2014/052885
Publication Date:
October 02, 2014
Filing Date:
February 07, 2014
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
C22C38/00; C22C38/52; C22C38/54; C21D6/00
Foreign References:
| JP2008539331A | 2008-11-13 | |||
| JP2012531525A | 2012-12-10 |
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