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Title:
METHOD AND APPARATUS FOR MANUFACTURING HARDENED STEEL
Document Type and Number:
Japanese Patent JP2011089150
Kind Code:
A
Abstract:

To provide an apparatus for manufacturing a hardened steel, such as hardened steel pipe, wherein even in case of applying the working method opened in Patent Literature 1 (the previous patent application with this applicant), the generation of oxidized scale can be restrained or canceled.

The apparatus for manufacturing the hardened steel is provided with; a feeding device for feeding the steel in the longitudinal direction; a heating device which is arranged at a first position separated from the feeding steel and heats the steel to a hardenable temperature zone; a cooling device wherein the steel is hardened by injecting cooling medium onto the steel in a second position at the downstream side to the feeding direction of the steel from the first position; and a scale-generation preventing gas supplying system wherein inert gas or reducing gas is filled up in the space surrounding the portion heated with the heating device, in the steel.


Inventors:
IMAI KAZUHITO
FUJIMOTO HIRONORI
TOMIZAWA ATSUSHI
NISHIHATA HITOMI
INOUE SABURO
Application Number:
JP2009241588A
Publication Date:
May 06, 2011
Filing Date:
October 20, 2009
Export Citation:
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Assignee:
SUMITOMO METAL IND
SUMITOMO PIPE & TUBE CO LTD
International Classes:
C21D9/08; C21D1/667; C21D1/70; B60G7/00; B62K19/06; B62M3/00
Domestic Patent References:
JP2002060833A2002-02-28
JPH02243723A1990-09-27
JPS563889B21981-01-27
JP2002003933A2002-01-09
JPS5235110A1977-03-17
JPH02243723A1990-09-27
JPS563889B21981-01-27
JP2002003933A2002-01-09
JPS5235110A1977-03-17
JPS5097568A1975-08-02
JP2011089151A2011-05-06
Foreign References:
WO2006093006A12006-09-08
Attorney, Agent or Firm:
Shoichi Hirose