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

Patent 5576113 Issued on November 19, 1996. Estimated Expiration Date:

January 27, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Isotropic and high-strength high silicon steel sheet
Patent #: 4043805
Issued on: 08/23/1977
Inventor: Hayami , et al.

Isotropic tool steel
Patent #: 4729872
Issued on: 03/08/1988
Inventor: Kishida , et al.

Method for producing cold-rolled steel sheet
Patent #: 5078809
Issued on: 01/07/1992
Inventor: Kinoshita, et al.

Rolled product with textured surface for improved lubrication, formability and brightness
Patent #: 5250364
Issued on: 10/05/1993
Inventor: Hector, Jr., et al.

Nickel alloy electroplated cold-rolled steel sheet excellent in press-formability and phosphating-treatability Patent #: 5336567
Issued on: 08/09/1994
Inventor: Watanabe, et al.

Inventors

Application

No. 187000 filed on 01/27/1994

US Classes:

428/679, Co- or Ni-base component next to Fe-base component428/684Containing 0.01-1.7% carbon (i.e., steel)

Examiners

Primary: Wyszomierski, George

Attorney, Agent or Firm

Wenderoth, Lind & Ponack

Foreign Patent References

0173906 EP. 03/21/1986
0524098 EP. 01/21/1993
3229246 DE. 02/21/1983

International Class

B32B 015/02

Foreign Application Priority Data

1993-06-04 JP

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 Ɗr which is the difference among the Lankford values (r) is set to be less than &#b1;0.15 so that the elongation coefficient of the plated steel plate in lengthwise, widthwise, and oblique directions is almost constant, i.e., so that the generation of earring can be prevented in drawing and ironing a sheet comprising the steel plate into the battery can. 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.