(19)
(11) EP 0 310 376 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.01.1990 Bulletin 1990/03

(43) Date of publication A2:
05.04.1989 Bulletin 1989/14

(21) Application number: 88309025.0

(22) Date of filing: 29.09.1988
(51) International Patent Classification (IPC)4B21B 1/38
(84) Designated Contracting States:
DE FR GB

(30) Priority: 30.09.1987 JP 244190/87
30.09.1987 JP 244191/87

(71) Applicant: KAWASAKI STEEL CORPORATION
Chuo-ku Kobe City (JP)

(72) Inventors:
  • Hiruta, Toshiki c/o Technical Research Division
    Chiba City Chiba Pref. (JP)
  • Yarita, Ikuo c/o Technical Research Division
    Chiba City Chiba Pref. (JP)
  • Abe, Hideo c/o Technical Research Division
    Chiba City Chiba Pref. (JP)

(74) Representative: Overbury, Richard Douglas et al
HASELTINE LAKE & CO Hazlitt House 28 Southampton Buildings Chancery Lane
London WC2A 1AT
London WC2A 1AT (GB)


(56) References cited: : 
   
       


    (54) Rolling process for clad steel


    (57) A process for rolling a clad steel satisfactorily reduces the adverse influence of the difference of the deformation resistance of the metal layers composing the clad steel and thereby improves the yield of the rolling process. The rolling process for clad steel includes a step pre-form rolling for a length of 20% to 80% of the overall length of the clad steel. After pre-forming rolling, reduction rolling is performed at a draft substantially equal to or greater than the draft of the pre-form rolling. According to the invention, pre-form rolling process and reduction rolling process are performed for at least two passes.





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