Title:
MANUFACTURING METHOD OF FERRITIC STAINLESS STEEL PRODUCT
Document Type and Number:
Japanese Patent JP2014181397
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To make it possible to stably form a nitride layer even when nitriding temperature is set to temperature lower than 1100°C.SOLUTION: In performing a nitriding treatment process of heating a product to be processed made of ferritic stainless steel inside a nitriding chamber 2 of a nitriding furnace 1, which has inert gas atmosphere containing Ngas, at high nitriding temperature or higher than a transformation point and forming a nitride layer on a surface of the product to be processed, the nitriding temperature in the nitriding treatment process is set to temperature lower than 1100°C and a state where solid-state carbon 11 exists on an inner wall of the nitriding chamber 2 is created. Accordingly, a passive film can be destroyed by the action of the solid-state carbon 11 which exists on the inner wall of the nitriding chamber 2 and carbon contained in a material of the product to be processed. Therefore, even when the nitriding temperature is set to temperature lower than 1100°C, nitrogen can be stably made become solid solution on the surface of ferritic stainless steel, and the nitride layer can be stably formed.
Inventors:
WATANABE TEPPEI
IWASE KOJI
IWASE KOJI
Application Number:
JP2013058113A
Publication Date:
September 29, 2014
Filing Date:
March 21, 2013
Export Citation:
Assignee:
DENSO CORP
International Classes:
C23C8/26; C21D1/06; C21D6/00; C22C38/00; C22C38/18; C22C38/40
Domestic Patent References:
| JPH10219418A | 1998-08-18 |
Foreign References:
| WO2011092998A1 | 2011-08-04 |
Attorney, Agent or Firm:
Patent business corporation ゆうあい patent firm
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