NITRIDED OR SOFT NITRIDED PART WITH EXCELLENT WEAR RESISTANCE AND PITTING RESISTANCE, AND NITRIDING AND SOFT NITRIDING METHODS

WIPO Patent Application WO/2016/153009

A1

Provided are: a nitrided or soft nitrided part with excellent wear resistance and pitting resistance; and nitriding and soft nitriding methods. A nitrided part or soft nitrided part obtained from steel containing, in mass%, C: 0.05-0.3%, Si: 0.05-1.5%, Mn: 0.2-1.5%, P: not more than 0.025%, S: 0.003-0.05%, Cr: 0.5-2.0%, Al: 0.01-0.05% and N: 0.003-0.025%, the balance being obtained from Fe and impurities, the nitrided part or soft nitrided part being characterized in that: the surface layer is obtained from a layer of an iron-, nitrogen- and carbon-containing compound and a nitrogen diffusion layer located therebelow; said compound layer is obtained from an ε monophase; the thickness of the ε monophase is 8-30 µm; the Vickers hardness is at least 680 HV; and the volume fraction of holes in the ε monophase is less than 10%.

WO/2018/105693	METHOD FOR VACUUM-CURING METAL WORKPIECE AND METHOD FOR PRODUCING METAL WORKPIECE USING SAME
JPH07116585	[Title of the Invention] A method for gas nitriding a thin sheet made of malaging steel
JP2008308767	NITRIDING TREATMENT METHOD AND NITRIDING TREATMENT APPARATUS USED THEREFOR

UMEHARA TAKAHIDE (JP)
YUYA MASATO (JP)

PCT/JP2016/059489

September 29, 2016

March 24, 2016

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NIPPON STEEL & SUMITOMO METAL CORP (JP)

C23C8/26; C21D1/06; C21D1/76; C21D9/32; C22C38/00; C22C38/60; C23C8/32

JPH07179985A	1995-07-18
JPH08165557A	1996-06-25
JPH08165556A	1996-06-25
JP2014118583A	2014-06-30
JP5669979B1	2015-02-18
JP2002069609A	2002-03-08
JP2013221203A	2013-10-28

See also references of EP 3276040A4

AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)

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