Electric heating – Inductive heating – Metal working
Patent
1997-10-27
1999-11-23
Leung, Philip H.
Electric heating
Inductive heating
Metal working
219645, 219656, 219674, 72202, H05B 606, B21B 126
Patent
active
059904640
ABSTRACT:
A method and hot rolling apparatus for producing a hot rolled steel sheet include a roughing rolling mill to roughing roll a heated slab into a sheet bar, at least one solenoid-type induction heater arranged for re-heating the sheet bar over its entire width, and a finish rolling mill arranged to finish roll the re-heated sheet bar into a hot rolled steel sheet having a predetermined thickness. An initial temperature before rolling is set to be low, and re-heating of the sheet bar is carried out around the middle of the hot rolling apparatus. The thermal energy required for rolling is thereby reduced as a whole without damaging the quality of the resulting hot rolled steel sheet. A descaling apparatus is provided prior to the finish rolling mill to remove oxide scales on surfaces of the sheet bar, whereby the resulting hot rolled steel sheet is free of scale flaws and exhibits superior surface properties.
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patent: 4447690 (1984-05-01), Grever
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Patent Abstracts of Japan, vol. 014, No. 127 (M-0947), Mar. 9, 1990 & JP 01 321009 A (Kawasaki Steel Corp.), Dec. 27, 1989.
Induction Heating in Rolling Mills, ABB Review, vol. 89, No. 2, Feb. 1989, pp. 25-30.
Ross N.V. et al: "Induction Heating of Strip: Solenoidal and Transverse Flux" Iron and Steel Engineer, vol. 69, No. 6, Jun. 1992, pp. 39-43.
Eda Hisatomo
Hino Yoshimichi
Masuda Sadakazu
Minote Toru
Terauchi Takumasa
Leung Philip H.
NKK Corporation
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