Title:
HEAT TREATMENT FURNACE
Document Type and Number:
WIPO Patent Application WO/2021/039677
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a heat treatment furnace for quenching that makes it possible to forgo the used of a converted gas and suitably prevent the appearance of a modified layer resulting from decarburization or the like in the surface of a treated object such as steel. A heat treatment furnace (10) according to one embodiment of the present invention is provided with: a gas supply unit (26) configured so as to supply a neutral gas or an inactive gas to a quenching heating chamber (12); and an internal structure such as a muffle (34) in the quenching heating chamber that is at least partially made from a graphite-based material.
Inventors:
TAKAHASHI SHINICHI (JP)
KANDA KIICHI (JP)
KANDA KIICHI (JP)
Application Number:
PCT/JP2020/031745
Publication Date:
March 04, 2021
Filing Date:
August 22, 2020
Export Citation:
Assignee:
KANTO YAKIN KOGYO CO LTD (JP)
International Classes:
F27B9/04; C21D1/18; C21D1/63; C21D1/76; F27B9/06; F27B9/34; F27D7/06
Foreign References:
JP5517382B1 | 2014-06-11 | |||
JPS4942778B1 | 1974-11-16 | |||
JPH0411786B2 | 1992-03-02 | |||
JPH09101086A | 1997-04-15 | |||
JPS5792757U | 1982-06-08 |
Attorney, Agent or Firm:
YAMAZAKI Akihiro (JP)
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