HEAT-TREATMENT FURNACE, METHOD OF HEAT TREATMENT, AND METHOD OF USING HEAT-TREATMENT FURNACE

WIPO Patent Application WO/2010/032769

A1

A heat-treatment furnace is provided which enables nitriding of stable quality to be maintained over long. The heat-treatment furnace is used for halogenating and nitriding a steel material by heating the material in a given atmosphere and has a structure therein which is exposed to a treatment space where the nitriding is conducted, the surface of the structure being constituted of a material that is an alloy comprising 50-80 mass% nickel and 0-20 mass% iron.  Due to the constitution, the surface of the structure in the furnace is unsusceptible to nitriding.  The halogenation and nitriding of works can be stably conducted over long, and nitride layers suitable for respective purposes can be stably formed on all steel materials including steels difficult to nitride.

JPH08152277	HEAT INSULATION CERAMIC FIBER BLOCK, AND HEAT INSULATION EXECUTING METHOD
WO/2010/116960	HIGHLY ZIRCONIA-BASED REFRACTORY AND MELTING FURNACE
JP3702483	CARBON-CONTAINING WATER-BASE CASTING MATERIAL

WATANABE TAKANORI (JP)
SAKATA ASAHIRO (JP)
IWAMURA HIDEAKI (JP)

PCT/JP2009/066209

March 25, 2010

September 10, 2009

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AIR WATER INC (JP)
WATANABE TAKANORI (JP)
SAKATA ASAHIRO (JP)
IWAMURA HIDEAKI (JP)

F27D1/00; C22C19/03; C23C8/02; C23C8/08; C23C8/26; C23C8/32

JPH10212565A	1998-08-11
JPH06221766A	1994-08-12
JPH0829090A	1996-02-02
JPH0978224A	1997-03-25
JP2000073156A	2000-03-07

MORIMOTO, NAOYUKI (JP)
Naoyuki Morimoto (JP)

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