Metal treatment – Compositions – Heat treating
Patent
1990-11-09
1992-06-02
Dean, R.
Metal treatment
Compositions
Heat treating
266111, 266274, 148605, 148631, 148711, C21D 134, C21D 963
Patent
active
051183668
ABSTRACT:
Disclosed is a method of floatingly supporting a metallic strip in a direct firing type continuous heat treating furnace accommodating a plurality of floater nozzles. In this method, furnace gas is initially supplied to and pressurized by a plurality of multistage booster fans. The temperature of the furnace gas to be supplied to the booster fans is less than a critical temperature of the fans. When the temperature of the furnace gas is less than the temperature of the material of the strip, the temperature of the furnace gas is raised to a temperature near the material temperature in combustion chambers provided with respective direct firing type burners. The furnace gas is then supplied to the floater nozzles, the internal pressure of which is controlled prior to being jetted.
REFERENCES:
patent: 3744961 (1973-07-01), Eguchi et al.
Chugai Ro Co. Ltd.
Dean R.
Phipps Margery S.
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