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Manufacturing method of steel in which an element of treatment gas is dissolved and diffused

A technology for gas processing and manufacturing method, applied in solid diffusion coating, coating, metal material coating process, etc., can solve the problems of spending a lot of time, increasing manufacturing cost, trouble, etc.

Inactive Publication Date: 2016-02-03
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with this method, the anti-treatment agent must be attached to the surface of the steel and then removed, which is troublesome and takes a lot of time to finish
Therefore, the manufacturing cost increases

Method used

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  • Manufacturing method of steel in which an element of treatment gas is dissolved and diffused
  • Manufacturing method of steel in which an element of treatment gas is dissolved and diffused
  • Manufacturing method of steel in which an element of treatment gas is dissolved and diffused

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Embodiment Construction

[0039] Hereinafter, several exemplary embodiments of the steel manufacturing method according to the present invention will be described with reference to the accompanying drawings. The term "treatment surface" in this specification may be a part of the surface of the steel which will be in contact with the treatment gas and has elements of the treatment gas dissolved and diffused therein (i.e. elements of the treatment gas are dissolved and diffused in the surface layer of the steel ) to obtain the desired properties. On the other hand, the term "non-treated surface" in this specification may be a part of the surface of steel which is adjacent to the treated surface and in which the amount of dissolved elements of the treated gas is lower than in the treated surface. Therefore, the non-treated surface is not limited to the surface into which the element of the treatment gas is not dissolved. In addition, the term "steel manufacturing method" in this specification may include...

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Abstract

A manufacturing method of steel (1a) in which an element of the treatment gas is dissolved and diffused includes heating the steel, making a treatment gas contact a surface of the steel such that an element of the treatment gas dissolves and diffuses from the surface of the steel into a surface layer thereof, and reducing a concentration of the treatment gas near a non-treatment surface that is a portion of the surface of the steel.

Description

technical field [0001] The present invention relates to a method for producing steel in which an element of a treatment gas is suitably dissolved and diffused in a part of the surface of the steel. Background technique [0002] Carburizing, nitriding or carbonitriding etc. are applied to the steel using process gases to improve the durability of the surface of the steel and the like. In these treatments, by bringing the treatment gas into contact with the heated steel surface, elements of the treatment gas dissolve from the treated surface of the steel and diffuse into its surface layer. [0003] Here, it is easy to perform these treatments on the entire surface layer of steel, but it is not easy to perform these treatments on only a part of the surface layer of steel. In view of this, for example, Japanese Patent Application Publication No. 11-217626 (JP11-217626A) proposes a gear carburizing method as an example. Here, particles of the anti-carburization agent are spraye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22C23C8/26C23C8/32
CPCC23C8/04C23C8/22C23C8/26C23C8/34C23C8/02C23C8/32
Inventor 平松真一稻垣功二金泽孝明
Owner TOYOTA JIDOSHA KK