Dowa Thermotech Co., Ltd.

Hokuto Hatanaka

Bin Sun

Katsushige Shimizu

Masakazu Kawahara

Yasuhiro Koyama

A continuous nitriding treatment furnace includes a nitriding chamber, a heater, a first nitriding zone, and a second nitriding zone lower in atmosphere gas temperature than the first nitriding zone by 25&#xb0; C. to 150&#xb0; C., the continuous nitriding treatment furnace being configured such that an atmosphere gas in the first nitriding zone flows into the second nitriding zone and being configured to execute a nitriding treatment that forms an iron nitride compound layer composed of an &#x3b5; phase or of the &#x3b5; phase and a &#x3b3;' phase on a surface of the steel member in the first nitriding zone and precipitates the &#x3b3;&#x2032; phase in the iron nitride compound layer in the second nitriding zone.

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Shiga, Japan

Hokuto Hatanaka