Battery can, sheet for forming battery can, and method for manuf

Metal treatment – Process of modifying or maintaining internal physical... – Producing or treating layered – bonded – welded – or...

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148530, 148534, C21D 804

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active

056037821

ABSTRACT:
A steel plate having a plated layer on the upper and lower surfaces thereof to be processed into a battery can which is cylindrical and open in one end thereof by drawing and ironing processing. The plated steel plate has more than 1.2 as a Lankford value (r) which is a width deformation degree in a lengthwise direction thereof/a thickness deformation degree in the lengthwise direction thereof, a width deformation degree in a widthwise direction thereof/a thickness deformation degree in the widthwise direction thereof, a width deformation degree in an oblique direction thereof/a thickness deformation degree in the oblique direction thereof. In-plane anisotropy .DELTA.r which is the difference among the Lankford values (r) is set to be less than .+-.0.15. In order to make the elongation coefficient of the plated steel plate constant in the three directions, a very low carbon steel plate is used. The steel plate is cold-rolled at 80-90%. The plated layer is allowed to have a granular structure by annealing it after it is plated.

REFERENCES:
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patent: 4729872 (1988-03-01), Kishida et al.
patent: 5078809 (1992-01-01), Kinoshita et al.
patent: 5250364 (1993-10-01), Hector et al.
patent: 5336567 (1994-08-01), Watanabe et al.
patent: 5360676 (1994-11-01), Kuguminato et al.
Patent Abstracts of Japan, unexamined applications, E section, vol. 17, No. 289, Jun. 3, 1993, p. 130 E 1375 (JP-A-5 21 044).

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