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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10494692 B1

PDFFull Text
Date of Patent:
Dec. 03, 2019

Filed:

Nov. 13, 2014

Manufacturing method of mechanical component using martensitic stainless steel, rotating device, rolling bearing and rolling bearing unit

Applicant:

Nsk Ltd., Tokyo, JP;

Inventors:

Chikara Matsuzawa, Fujisawa, JP;

Takafumi Yasuhara, Fujisawa, JP;

Hiroshi Nishizawa, Fujisawa, JP;

Norihiro Aoki, Fujisawa, JP;

Koji Takano, Tokyo, JP;

Masaru Kuge, Tokyo, JP;

Assignee:

NSK LTD., Tokyo, JP;

Attorney:

Sughrue Mion, PLLC

Primary Examiner:

Christopher J Besler

Int. Cl.
CPC ...
F16C 33/32 (2006.01); F16C 33/62 (2006.01); F16C 33/64 (2006.01); C21D 6/00 (2006.01); C21D 6/02 (2006.01); C21D 6/04 (2006.01); C21D 9/04 (2006.01); C21D 9/00 (2006.01); F16C 19/06 (2006.01); C21D 9/40 (2006.01); C21D 1/18 (2006.01); C22C 38/00 (2006.01); C22C 38/22 (2006.01);
U.S. Cl.
CPC ...
C21D 9/40 (2013.01); C21D 1/18 (2013.01); C21D 6/002 (2013.01); C21D 6/02 (2013.01); C21D 6/04 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/22 (2013.01); F16C 33/32 (2013.01); F16C 33/62 (2013.01); F16C 33/64 (2013.01); C21D 9/00 (2013.01); C21D 2211/008 (2013.01); F16C 19/06 (2013.01); F16C 2204/72 (2013.01); F16C 2240/48 (2013.01); F16C 2316/13 (2013.01);
Abstract

A martensitic stainless steel containing, by mass %, C: 0.20% to 0.40%, N: 0.1% or less, Mo: 3% or less, and Cr: 12.0% to 16.0%, such that 0.3%≤C+N≤0.4% and a PI value (=Cr+3.3Mo+16N) is 18 or more, with the remainder being substantially Fe and unavoidable impurities is quenched from a temperature of 1,030° C. to 1,140° C. and subjected to a subzero treatment and tempering so as to obtain a prior austenite crystal grain size of a surface layer of 30 μm to 100 μm and a surface hardness of 58 HRc to 62 HRc.

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