PURPOSE: To obtain a zirconium alloy flat plate for a nuclear reactor having excellent corrosion resistance by executing heating and holding or the like in a β range of a cold rolled sheet of a zirconium alloy by using IR lamps of a prescribed wavelength and limiting the max. temp. difference between the transverse widths of the rolled sheet.
CONSTITUTION: The flat product 4, such as strip, band or sheet, obtd. by cold rolling of the zirconium alloy which is zircaloy 2 or zircaloy 4 is subjected to heating and holding, then to quenching and normalizing. A panel 3 which includes the plural IR tubes arranged along the longitudinal direction of the product 4 and in which the respective tubes have the IR rays of a wavelength 0.8 to 5 micrometers to be independently controlled is used for the heating and holding described above. The product 4 is heated to the max. temp. difference ΔT1:<35°C between the transverse widths of the product. The quenching is executed at 1,000 to 800°C and at a cooling rate of 40 to 100°C/S. The flat product 4 of the zirconium alloy which has the excellent corrosion resistance and a thickness of 0.4 to 3 mm and is used for the nuclear reactor is thus obtd.
PIEERU BARUBURISU
JIERAARU BIYUNERU
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