Title:
STEEL MEMBER AND METHOD FOR PRODUCING THE SAME
Document Type and Number:
Japanese Patent JP2019035111
Kind Code:
A
Abstract:
To provide a steel member having high bearing stress fatigue strength, and a method of producing the same.SOLUTION: A steel member 10 has a surface layer 2, and a first martensite layer 4 that is disposed under the surface layer 2 and has a nitrogen element concentration of 0.2-1.0 mass%. The surface layer 2 contains at least one of lithium-iron complex oxide, FeO, and FeOas the main component and further contains at least one selected from the group consisting of solid-soluble silicon, silicon oxide, and silicon nitride. The first martensite layer 4 has a γ phase 15 with an area ratio of 30% or less and a ε phase 17 with an area ratio of 10% or less. The surface of nitrided steel is coated with a denitrification inhibitor and is then subjected to high frequency heating, to produce the steel member.SELECTED DRAWING: Figure 1
Inventors:
HIRAI YUYA
WATANABE YOICHI
WATANABE YOICHI
Application Number:
JP2017157017A
Publication Date:
March 07, 2019
Filing Date:
August 16, 2017
Export Citation:
Assignee:
PARKER NETSU SHORI KOGYO KK
International Classes:
C22C38/00; C21D1/06; C21D1/10; C21D1/70; C21D1/78; C23C26/00
Domestic Patent References:
| JP2017110247A | 2017-06-22 | |||
| JPS5896815A | 1983-06-09 | |||
| JPH02250949A | 1990-10-08 | |||
| JP2011032514A | 2011-02-17 | |||
| JP2008038220A | 2008-02-21 |
Attorney, Agent or Firm:
Toshieko Kondo
Chongqing Sugano
Keita Takeyama
Kaoru Okada
Chongqing Sugano
Keita Takeyama
Kaoru Okada