Title:
CARBONITRIDED STEEL COMPONENT
Document Type and Number:
Japanese Patent JP2020111804
Kind Code:
A
Abstract:
To provide a carbonitrided steel component which enhances a residual stress improvement effect and has higher intensity.SOLUTION: A carbonitrided steel component contains 0.15 to 0.25% C, 0.20 to 2.00% Si, 0.30 to 2.00% Mn, 0.030% or less P, 0.030% or less S, 0.10 to 1.50% Cr, 0 to 0.60% Mo (including 0%), 0.010 to 0.100% Al, and 0.0050 to 0.0300% N. The component has a carbonitrided layer thereon, contains 0.5 to 1.4% Cs, 0.1 to 0.9% Ns and 0.6 to 1.6% of Cs+Ns, satisfies a relationship of (3×[Si]+2×[Mn])×Ns≥0.4, has a compressive residual stress of the surface of 1,000 MPa or more, a maximum compressive residual stress of 1,400 MPa or more, has no grain boundary oxidation layer of the surface, has the number of precipitates with circle-equivalent diameters of 0.02 to 2.00 μm in the carbonitrided layer within a predetermined range from the surface of 100,000 pieces/mm2 or more, and has a maximum precipitate in a predetermined range from the surface of with circle-equivalent diameters of 5.0 μm or less.SELECTED DRAWING: None
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Inventors:
MAKINO KOMEI
SAKUDA SATOSHI
USAMI TAKESHI
MIZUNO HIROYUKI
FUKUDA YASUHIRO
SAKUDA SATOSHI
USAMI TAKESHI
MIZUNO HIROYUKI
FUKUDA YASUHIRO
Application Number:
JP2019004202A
Publication Date:
July 27, 2020
Filing Date:
January 15, 2019
Export Citation:
Assignee:
AICHI STEEL WORKS LTD
International Classes:
C22C38/00; C21D1/06; C21D1/773; C22C38/38; C23C8/34; C23C10/60
Attorney, Agent or Firm:
Patent Business Corporation Aichi International Patent Office