Title:
機械部品、及び、機械部品の製造方法
Document Type and Number:
Japanese Patent JP7445119
Kind Code:
B2
Abstract:
To provide a mechanical component having excellent fatigue strength and machinability.SOLUTION: A mechanical component disclosed herein has a chemical composition consisting of, in mass%, C: 0.30-0.40%, Si: 0.30-1.00%, Mn: 1.00-2.00%, P: 0.035% or less, S: 0.050-0.100%, Al: 0.050% or less, Cr: 0.02-1.50%, Ti: 0.002-0.020%, N: 0.003-0.030%, and O: 0.0050% or less, with the balance being Fe and impurities. A total area ratio of martensite and bainite is 90% or more. An average grain size of old austenitic grains at a stress concentration area is 26 μm or less, and an average grain size of old austenitic grains at a normal area is 100-2000 μm.SELECTED DRAWING: Figure 5
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Inventors:
Takanori Iwahashi
Makoto Egashira
Kei Miyanishi
Makoto Egashira
Kei Miyanishi
Application Number:
JP2020014451A
Publication Date:
March 07, 2024
Filing Date:
January 31, 2020
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; B21J5/00; C21D8/06; C21D9/30; C22C38/60
Domestic Patent References:
| JP2017057474A | ||||
| JP2012077371A | ||||
| JP2017071859A | ||||
| JP2007321197A | ||||
| JP2005060730A |
Foreign References:
| WO2016194938A1 |
Attorney, Agent or Firm:
Ascend Patent Attorneys Corporation