Steel-toothed car
The steel gear design with a carburized hardened layer and controlled austenite grain density addresses pitting strength issues by improving tempering resistance and microstructural stability, resulting in enhanced durability under high-pressure conditions.
JP2026079052APending Publication Date: 2026-05-15NIPPON STEEL CORPORATION
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Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- NIPPON STEEL CORPORATION
- Filing Date
- 2024-10-30
- Publication Date
- 2026-05-15
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Figure 2026079052000001_ABST
Abstract
To provide steel gears with excellent pitching strength. [Solution] The steel gear (1) of this embodiment comprises a carburized hardened layer formed on the surface of the tooth surfaces of multiple teeth (GT), and a core containing, by mass%, C: 0.15~0.30%, Si: 0.70~2.00%, Mn: 0.45~1.00%, P: 0.035% or less, S: 0.035% or less, Cr: 0.05~2.00%, Mo: 0.05~0.60%, Al: 0.005~0.050%, and N: 0.0020~0.0200%, with the remainder being Fe and impurities. The number density of residual austenite grains with an equivalent circular diameter of 0.20~0.50 μm on the surface of the tooth surface is 0.15~0.45 grains / mm 2 That is the case.
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