Denki Kogyo Company, Limited

Keiichi Kubo

Tetsuo Fusato

Yohei Awata

Seiichi Sawatsubashi

Mitsunori Hayashi

Provided is an induction heating device with which discharging can be easily avoided even when a large electric current is used. The induction heating device comprises a high-frequency power supply provided with a connection portion for an alternating-current power supply, and a heating coil portion connected to the high-frequency power supply. In the heating coil portion, a plurality of coils include n coils surrounding a cavity portion in a plane, wherein the plurality of coils are mutually connected in series via one of a plurality of capacitors.

Induction heating device, radioactive waste melting process device equipped with said induction heating device, and radioactive waste melting and solidification process device

There is provided a heat treatment method in which high-quality tempering treatment can be performed in a short period of time. In this method, when an object to be treated is tempered after being quenched, the object to be treated is rapidly cooled to a 90% martensite transformation finishing temperature without being cooled to the ordinary temperature after quench heating, and then is subjected to 100% martensite transformation by using a 100&#xb0; C. liquid, and thereafter, tempering treatment is performed after the whole of the object to be treated is soaked by using the 100&#xb0; C. liquid.

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Tokyo, Japan

Keiichi Kubo