1975-10-22
1977-05-03
Envall, Jr., R. N.
F27D 112
Patent
active
040216039
ABSTRACT:
A roof assembly for an arc furnace is disclosed in which a furnace roof ring and a plurality of roof units are assembled together to define a roof section frustoconical in cross section and with a roof top opening, and a roof top made of an electrically insulating refractory and provided with electrode holes closely fitted into the roof top opening. Each sectionalized roof unit comprises a main body cast from cast iron or copper, and a cooling coil embedded in the main body with end sections being extended out of the upper major upper surface of the main body so as to be used as a cooling water inlet and an outlet. In order to ensure the satisfactory high-temperature strength and thermal-shock resistance, the inner major surface of the main body directed toward the inside of the furnace is partially lined with the refractory or corrugated.
REFERENCES:
patent: 3756172 (1973-09-01), Brereton et al.
patent: 3829595 (1974-08-01), Nanjyo et al.
Aoshika Masayuki
Nanjyo Toshio
Envall, Jr. R. N.
Ishikawajima-Harima Jukogyo Kabushiki Kaisha
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