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.
FUJIMOTO HIRONORI
TOMIZAWA ATSUSHI
NISHIHATA HITOMI
INOUE SABURO
SUMITOMO PIPE & TUBE CO LTD
JP2002060833A | 2002-02-28 | |||
JPH02243723A | 1990-09-27 | |||
JPS563889B2 | 1981-01-27 | |||
JP2002003933A | 2002-01-09 | |||
JPS5235110A | 1977-03-17 | |||
JPH02243723A | 1990-09-27 | |||
JPS563889B2 | 1981-01-27 | |||
JP2002003933A | 2002-01-09 | |||
JPS5235110A | 1977-03-17 | |||
JPS5097568A | 1975-08-02 | |||
JP2011089151A | 2011-05-06 |
WO2006093006A1 | 2006-09-08 |