Title:
鋼製部品
Document Type and Number:
Japanese Patent JP6750409
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a bearing part having excellent rolling fatigue life and further excellent in machinability.SOLUTION: There is provided a steel-made component containing specific amounts of C, Si, Mn, P, S, Cr, Al, Ca, Mg and the balance Fe with inevitable impurities, having predictive maximum inclusion diameter √AREAmax calculated by an extreme value statistic treatment of √AREA, a ratio of a composite inclusion of oxide and sulfide, average composition of oxide and content of MnS and CaS in whole inclusion included in specific areas in the inclusion which is breaking origin of an ultrasonic fatigue test, a ratio between retained austenite volume percentage at a depth position at 20 μm from a surface and maximum austenite volume percentage in a range of 200 μm depth from the surface of 0.6 or less and having plastic flow structure with thickness of 1 to 15 μm on the surface.SELECTED DRAWING: Figure 2
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Inventors:
Tatsuya Iwasaki
Junya Yamamoto
Koji Watari
Masayuki Hashimura
Yutaka Neishi
Junya Yamamoto
Koji Watari
Masayuki Hashimura
Yutaka Neishi
Application Number:
JP2016172256A
Publication Date:
September 02, 2020
Filing Date:
September 02, 2016
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; C22C38/38; C22C38/60
Domestic Patent References:
| JP2004225128A | ||||
| JP2006028598A | ||||
| JP2016094649A |
Foreign References:
| WO2014175377A1 | ||||
| CN105671434A |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Fukuchi Ritsuo
Nakamura Asayuki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Fukuchi Ritsuo
Nakamura Asayuki