METHOD FOR CONTROLLING FURNACE PRESSURE IN BOX-TYPE ANNEALING FURNACE

PROBLEM TO BE SOLVED: To provide a method for controlling a furnace pressure in a box-type annealing furnace to effectively prevent occurrence of a temper color, together with improving annealing efficiency by shortening a cooling time, in a cooling step after the box-type annealing. SOLUTION: This...

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Bibliographic Details
Main Authors TACHIBANA KIYOSHI, ITO KOJI, YAMASHITA HARUTOSHI
Format Patent
LanguageEnglish
Published 24.06.2004
Edition7
Subjects
CHEMISTRY
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
METALLURGY
METALLURGY OF IRON
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
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Summary:PROBLEM TO BE SOLVED: To provide a method for controlling a furnace pressure in a box-type annealing furnace to effectively prevent occurrence of a temper color, together with improving annealing efficiency by shortening a cooling time, in a cooling step after the box-type annealing. SOLUTION: This method controls the furnace pressure when starting cooling in the box-type annealing furnace into the positive pressure in the range of +0.49 to 6.47 kPa (+50 to 660 mmH2O), by monitoring the pressure of an atmospheric gas in an inner cover when a furnace body has been dismounted, and adjusting an opening of a flow control valve at an inlet on the basis of the result. COPYRIGHT: (C)2004,JPO
Bibliography:Application Number: JP20020344895