(19)
(11) EP 0 128 734 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.08.1985 Bulletin 1985/33

(43) Date of publication A2:
19.12.1984 Bulletin 1984/51

(21) Application number: 84303788

(22) Date of filing: 05.06.1984
(84) Designated Contracting States:
BE DE FR GB IT LU NL

(30) Priority: 11.06.1983 JP 10461783
08.12.1983 JP 23060283

(71) Applicant: NIPPON STEEL CORPORATION
 ()

(72) Inventors:
  • Misawa, Yasuo c/o Kimitsu Works
     ()
  • Dazai, Takeo c/o Kimitsu Works
     ()
  • Haeno, Tsutomu c/o Kimitsu Works
     ()
  • Saitoh, Yoshio c/o Kimitsu Works
     ()
  • Shimada, Masanori c/o Kimitsu Works
     ()
  • Ikegami, Hiroshi Yawata Works Nippon Steel Corp.
     ()
  • Yui, Katsuhiko Yawata Works Nippon Steel Corp.
     ()
  • Namba, Tadashige Tobata Plant & Machinery Works
     ()

   


(54) Method for cooling a steel strip in a continuous-annealing furnace


(57) The present invention relates to a method for cooling a steel strip (1) in a continuous-annealig furnace. Conventionally, the steel strip (1) is cooled by a water medium and, thus, oxidation is inevitable. Recently developed roll cooling methods can prevent oxidation but are disadvantageous in that the steel strip (1) is nonuniformly cooled as seen in its short width direction.
The present invention attains uniform cooling by means of feedback control and feedback-feedforward control, in which the blowing width of the gas-jet cooler (21, 53) is controlled by detecting the sheet temperature distribution with a thermometer(s) (24, 55, 60).






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