(19)
(11) EP 0 492 319 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
24.02.1993 Bulletin 1993/08

(43) Date of publication A2:
01.07.1992 Bulletin 1992/27

(21) Application number: 91121430.2

(22) Date of filing: 13.12.1991
(51) International Patent Classification (IPC)5: C25D 11/38
(84) Designated Contracting States:
DE FR GB

(30) Priority: 26.12.1990 JP 413925/90
26.12.1990 JP 413931/90

(71) Applicant: NKK CORPORATION
Tokyo 100 (JP)

(72) Inventors:
  • Iwasa, Hiroki
    Chiyoda-ku, Tokyo 100 (JP)
  • Watanabe, Toyofumi
    Chiyoda-ku, Tokyo 100 (JP)
  • Furuya, Hirohide
    Chiyoda-ku, Tokyo 100 (JP)
  • Kashiyama, Yoshitaka
    Chiyoda-ku, Tokyo 100 (JP)
  • Awaya, Takashi
    Chiyoda-ku, Tokyo 100 (JP)

(74) Representative: von Bezold, Dieter, Dr. et al
Dr. Dieter von Bezold Dipl.-Ing. Peter Schütz Dipl.-Ing. Wolfgang Heusler Brienner Strasse 52
80333 München
80333 München (DE)


(56) References cited: : 
   
       


    (54) Surface treated steel sheet for welded cans


    (57) An electrolytically chromated steel sheet which has an outstandingly good high-speed weldability without grinding and presents a lacquered or printed surface having an excellent finish, and which is particularly suitable for use in making a welded can. It carries on one surface thereof a film including a metallic chromium layer having a high proportion of granular metallic chromium having a large particle diameter, while on the other surface thereof, it carries a film including a metallic chromium layer in sheet form, i.e. not containing any granular chromium, or a film including a metallic chromium layer containing only a very low proportion of granular metallic chromium having a large particle diameter. The weight per unit area of the film on each surface, the proportion of granular metallic chromium having a large particle diameter in each film, and the critical particle diameter of such granular chromium are specifically limited from the standpoint of e.g. weldability.





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