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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9593390 B1

PDFFull Text
Date of Patent:
Mar. 14, 2017

Filed:

Mar. 24, 2011

Heat treatment method

Applicant:

Kazuhiko Katsumata, Saitama, JP;

Inventor:

Kazuhiko Katsumata, Saitama, JP;

Assignee:

IHI CORPORATION, , JP;

Attorney:

Ostrolenk Faber LLP

Primary Examiner:

Jessee Roe

Assistant Examiner:

Jenny Wu

Int. Cl.
CPC ...
C21D 6/00 (2006.01); C21D 1/667 (2006.01); C21D 1/76 (2006.01); C21D 9/00 (2006.01); F27B 9/20 (2006.01); F27B 9/24 (2006.01); F27B 9/26 (2006.01); F27D 7/06 (2006.01); F27D 9/00 (2006.01); F27D 15/02 (2006.01); C21D 1/20 (2006.01); C21D 1/22 (2006.01);
U.S. Cl.
CPC ...
C21D 1/667 (2013.01); C21D 1/20 (2013.01); C21D 1/22 (2013.01); C21D 1/76 (2013.01); C21D 9/0056 (2013.01); C21D 9/0062 (2013.01); F27B 9/20 (2013.01); F27B 9/2407 (2013.01); F27B 9/26 (2013.01); F27D 7/06 (2013.01); F27D 9/00 (2013.01); F27D 15/0206 (2013.01); C21D 2211/008 (2013.01); C21D 2211/009 (2013.01); F27D 2009/0005 (2013.01); F27D 2009/0075 (2013.01);
Abstract

The heat treatment method of the present invention includes: a first step of mist cooling a treatment object retained at a prescribed temperature by supplying mist-like coolant, to a target temperature near to and higher than a first transformation point at which a structure of the treatment object begins to be transformed into a prescribed structure; a second step, following the first step, of retaining the treatment object for a prescribed time in a state where supply of mist-like coolant is stopped; and a third step, following the second step, of cooling the treatment object to a temperature lower than or equal to the first transformation point. According to the present invention, it is possible to provide a heat treatment method capable of suppressing irregularity and deformation in the structure of the treatment object.

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