(19)
(11) EP 0 451 437 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.01.1992 Bulletin 1992/04

(43) Date of publication A2:
16.10.1991 Bulletin 1991/42

(21) Application number: 91100089.1

(22) Date of filing: 02.01.1991
(51) International Patent Classification (IPC)5: C10M 103/06, C10M 173/02
// (C10M173/02, 103:06), C10N40:24, C10N50:02, C10N70:00, C10N80:00
(84) Designated Contracting States:
BE DE ES FR GB IT NL

(30) Priority: 09.04.1990 JP 93348/90
30.11.1990 JP 334296/90

(71) Applicant: KAWASAKI STEEL CORPORATION
Chuo-Ku, Kobe-City Hyogo 651 (JP)

(72) Inventors:
  • Tobiyama, Yoichi, c/o Technical Research Division
    Chiba-shi, Chiba 260 (JP)
  • Kato, Chiaki, c/o Technical Research Division
    Chiba-shi, Chiba 260 (JP)
  • Morito, Nobuyuki, c/o Technical Research Division
    Chiba-shi, Chiba 260 (JP)
  • Kimura, Hajime, c/o Reseach Laboratories
    Chiba-shi, Chiba 260 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Maximilianstrasse 58
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) A galvanized steel sheet with high press formability and a method for manufacturing the same


    (57) There is provided a galvanized steel sheet with high press formability, which has an inorganic compound on a metallic galvanized layer thereof. The galvanized steel sheet according to the present invention is manufactured by bringing the plating surface of the galvanized steel sheet into contact with a water solution containing 0.1 wt% or more of a borate of alkaline metal, and then drying the steel sheet by heating within a temperature range of 60 to 400°C. The friction coefficient of the galvanized steel sheet of the invention is 80% or less of the friction coefficient obtained without the existence of the inorganic compound on the metallic galvanized layer and the amount of insoluble slimes of the inorganic compound left after water washing or alkali degreasing is less than 1 mg/m².






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