Title:
GEAR
Document Type and Number:
WIPO Patent Application WO/2023/203838
Kind Code:
A1
Abstract:
In the present invention, a gear is made of steel having a composition containing, by mass, 0.31-0.35% of C, 0.30% or less of Si, 0.20-0.80% of Mn, 0.030% or less of P, 0.030% or less of S, 0.35% or less of Cu, 0.25% or less of Ni, 1.00-1.40% of Cr, 0.95-1.10% of Mo, and 0.25-0.30% of V such that relationships (1) and (2) are satisfied, the remainder comprising Fe and unavoidable impurities. A soft nitriding treatment layer is provided on the surface layer, and a compound layer that is at least 5 μm in thickness and mainly contains iron nitride is provided. [Relationship 1] 3.36 × [Cr] + 13.7 × [Mo] + 5.59 × [V] > 15
[Relationship 2] 1.00 × [C]-0.20 × [Cr] + 0.20 × [Mo] + 1.00 × [V] - 0.26 > 0.2
Inventors:
ODA TOSHIHIRO (JP)
KATOU GOU (JP)
MAEDA MAKOTO (JP)
TAMAI TOMOYA (JP)
TUJII KENTA (JP)
HIGUCHI SHIGEKI (JP)
KATOU GOU (JP)
MAEDA MAKOTO (JP)
TAMAI TOMOYA (JP)
TUJII KENTA (JP)
HIGUCHI SHIGEKI (JP)
Application Number:
PCT/JP2023/004009
Publication Date:
October 26, 2023
Filing Date:
February 07, 2023
Export Citation:
Assignee:
JATCO LTD (JP)
International Classes:
C22C38/00; C21D1/06; C21D9/32; C22C38/46; C23C8/32
Domestic Patent References:
| WO2014192117A1 | 2014-12-04 | |||
| WO2019098340A1 | 2019-05-23 | |||
| WO2014136307A1 | 2014-09-12 | |||
| WO2010082685A1 | 2010-07-22 |
Foreign References:
| JP2009079253A | 2009-04-16 | |||
| JP2015059248A | 2015-03-30 | |||
| JP2021113338A | 2021-08-05 |
Attorney, Agent or Firm:
GOTOH & PARTNERS (JP)
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