Invention Grant
- Patent Title: Manufacturing method of mechanical component using martensitic stainless steel, rotating device, rolling bearing and rolling bearing unit
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Application No.: US16218928Application Date: 2018-12-13
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Publication No.: US10851433B2Publication Date: 2020-12-01
- Inventor: Chikara Matsuzawa , Takafumi Yasuhara , Hiroshi Nishizawa , Norihiro Aoki , Koji Takano , Masaru Kuge
- Applicant: NSK LTD.
- Applicant Address: JP Tokyo
- Assignee: NSK LTD.
- Current Assignee: NSK LTD.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2013-235002 20131113
- Main IPC: C21D6/02
- IPC: C21D6/02 ; C21D9/00 ; F16C33/32 ; F16C33/62 ; F16C33/64 ; F16C19/06 ; C21D9/40 ; C21D1/18 ; C21D6/00 ; C21D6/04 ; C22C38/00 ; C22C38/22

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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