Title:
LAMINATED STEEL SHEET FOR WELDED CAN EXCELLENT IN CORROSION RESISTANCE, WELDABILITY AND LAMINATE ADHESION
Document Type and Number:
Japanese Patent JP3183153
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce a laminated steel sheet for a welded can excellent in laminate adhesion, high speed weldability and corrosion resistance and produciable at a relatively low cost.
SOLUTION: The surface of a steel sheet 1 is applied with a granular tin part formed into a dispersed shape without executing tin melting treatment, the upper layer is applied with a chemical convertion treating layer composed of a metallic chromium layer 4 and a chromium hydrated oxide layer 5 each with a prescribed coating weight, and the upper layer is applied with a laminate film layer 8. As for the granular tin part, the lower layer side is composed of a tin-iron alloy 3 and the upper layer side is composed of metallic tin, and in each granular tin part occupying ≥90% of the granular tin part, the thickness (a) of the maximum thickness part is regulated to ≤0.8μm, and the thickness (a)1 of the maximum thickness part in the metallic tin on the upper layer side is regulated to 0.2 to 0.7μm. Then, the 50% separated average grain size of the granular tin part satisfying these thicknesses is regulated to 0.3 to <1.5μm, furthermore, the steel sheet surface coating area ratio of the granular tin part satisfying the above thickness is regulated to ≥10%, and the area ratio of the steel sheet surface not coated with the granular tin part is regulated to ≥60%.
Inventors:
Mikiyuki Ichiba
Yoshinori Yomura
Kei Kubo
Shinya Okude
Hisato Noro
Yoshinori Yomura
Kei Kubo
Shinya Okude
Hisato Noro
Application Number:
JP4417596A
Publication Date:
July 03, 2001
Filing Date:
February 06, 1996
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
B32B15/09; C23C28/00; C25D5/26; B32B15/08; (IPC1-7): C23C28/00; C25D5/26
Attorney, Agent or Firm:
Masatoshi Tomabechi