NITRIDING METHOD - TOYOTA MOTOR CORP

Title:

NITRIDING METHOD

Document Type and Number:

Japanese Patent JP2007238969

Kind Code:

A

Abstract:

To provide a nitriding method by which nitrogen atoms can be rapidly and uniformly incorporated from the surface layer of a steel component down into its deep part.

The nitriding method comprises heating the steel component in a gaseous nitriding treatment atmosphere, solidfying the nitrogen atoms contained in the nitriding treatment gas onto the surface of the steel component, and diffusing the solidified nitrogen atoms into the steel component. The treatment method performs the nitriding treatment while maintaining the heating temperature of the nitriding treatment at ≥590°C and lowering the concentration of the nitriding treatment gas lower thanr that of the nitriding treatment gas at the start of the nitriding treatment.

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Inventors:

TSUNODA KEISUKE
YAMAGUCHI TOSHIYA
SATO KIMIYASU

Application Number:

JP2006059358A

Publication Date:

September 20, 2007

Filing Date:

March 06, 2006

Export Citation:

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Assignee:

TOYOTA MOTOR CORP
AICHI STEEL WORKS LTD

International Classes:

C23C8/26; C21D1/06; C21D1/34; C21D1/42; C22C38/00; C22C38/04

Domestic Patent References:

JP2004217958A	2004-08-05
JP2004183099A	2004-07-02

Attorney, Agent or Firm:

Yusuke Hiraki
Sekiya Mitsuo
Yasushi Hayakawa

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