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Title:
METHOD FOR USING HEAT TREATMENT FURNACE, METHOD OF HEAT TREATMENT, AND HEAT TREATMENT FURNACE
Document Type and Number:
Japanese Patent JP2010070844
Kind Code:
A
Abstract:

To provide a method for using a heat treatment furnace, which can keep a stable nitriding quality for a long period of time.

The method for using the heat treatment furnace includes heating a steel material in predetermined atmospheres to halogenate and nitride the steel material. The heat treatment furnace uses an Ni-based corrosion-resistant heat-resistant alloy containing 0 mass% to 20 mass% Fe as a material that composes the surface of a structure in the furnace, which is exposed to a treatment space in which the steel material is nitrided. The method also includes halogenating and nitriding the steel material repeatedly in such a range that the thickness of a nitrided layer formed on the surface of the structure in the furnace is 25 m or less and the hardness of the surface is 900 Hv or less. Thereby, the surface of the structure in the furnace hardly causes a nitriding reaction, and the heat treatment furnace can halogenate and nitride an article to be treated stably for a long period of time, and can stably form the nitrided layer on all steel materials including a steel type which is hard to be nitrided, according to the purpose of the treatment.


Inventors:
Watanabe, Takanori
Sakata, Tomohiro
Iwamura, Hideaki
Application Number:
JP2009000040264
Publication Date:
April 02, 2010
Filing Date:
February 24, 2009
Export Citation:
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Assignee:
AIR WATER INC
International Classes:
C23C8/02; C21D1/06; C22C19/05; C23C8/24; C23C8/80; F27B5/04; F27B5/10
Domestic Patent References:
JPH05195193A
JPH09157830A
JP2007031759A
JPH10212565A
JPH06221766A
JPH0829090A
Attorney, Agent or Firm:
森本 直之