Title:
PRODUCTION METHOD FOR UNIVERSAL JOINT COMPONENT
Document Type and Number:
WIPO Patent Application WO/2023/282256
Kind Code:
A1
Abstract:
[Problem] To extend the rolling fatigue life of a universal joint component such as a cross rolling component. [Solution] A production method for a universal joint component having a prior-austenite crystal grain size of 7-11 in accordance with JIS G0551, the method comprising subjecting a NiCrMo steel containing, in percentage by mass, not less than 0.10% but less than 0.30% of C, not less than 0.05% but less than 0.30% of Si, 0.20-1.00% of Mn, at most 0.015% of P, at most 0.015% of S, 1.50-2.00% of Cr, 0.10-0.50% of Mo, 2.50-4.00% of Ni, 0.01-0.03% of Al, and 0.005-0.015% of N to hot forging, normalizing, and tempering, and thereafter, to a γ conversion thermal treatment at 800-930°C for 1-100 hours for at least once. Before being subjected to the hot forging, the NiCrMo steel may contain, in percentage by mass, not less than 0.10% but less than 0.30% of Mo. The universal joint component can used as a component having a cross rolling part as a member of a universal joint.
Inventors:
HASHI KUNIHIKO (JP)
KIKUCHI DAISUKE (JP)
MOTEGI JIN (JP)
KATO TSUYOSHI (JP)
KIKUCHI DAISUKE (JP)
MOTEGI JIN (JP)
KATO TSUYOSHI (JP)
Application Number:
PCT/JP2022/026695
Publication Date:
January 12, 2023
Filing Date:
July 05, 2022
Export Citation:
Assignee:
JAPAN STEEL WORKS M&E INC (JP)
NAKAMURA JICO KK (JP)
NAKAMURA JICO KK (JP)
International Classes:
F16D3/40; B21K1/14; C21D9/00; C22C38/00; C22C38/44; C22C38/48
Foreign References:
| JP2016138320A | 2016-08-04 | |||
| JPS59129756A | 1984-07-26 | |||
| JP2017106079A | 2017-06-15 | |||
| JP2002047552A | 2002-02-15 |
Attorney, Agent or Firm:
NAKAI Jun (JP)
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