Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1997-11-12
2000-03-28
Wyszomierski, George
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
428667, 428684, 148320, 148643, 148650, 148651, C21D 802
Patent
active
060429526
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to an extremely-thin steel sheet which can adopt all temper grades of T1.about.T6 and DR8.about.DR10 and is suitable for use in various two-piece cans (SDC: Shallow-Drawn Can, DRDC: Drawn & Redrawn Can, DTRC: Drawn & Thin Redrawn Can, DWIC: Drawing & Wall Ironing Can) or three-piece cans (Side Seam Soldered Can, Side seam Welded Can, Thermoplastic Bonded Side Seam Can) and has uniform material properties and thickness accuracy in spite of extremely-thin thickness and wide-width and is excellent in economy as well as a method of producing the same.
In the invention, the term "extremely-thin steel sheet" means both of a blackplate for surface treatment and a surface treated steel sheet.
2. Background Art
The steel sheet for the can is subjected to various platings of Sn [including a tin plated steel having an Sn plated quantity of not less than 2.8 g/m.sup.2 and a thin tin plated steel sheet LTS (Lightly Tin Coated Steel) having an Sn plated quantity of less than 2.8 g/m.sup.2 ], Ni, Cr and the like and thereafter used in a drink can, a food can and the like.
The material property of the steel sheet for the can is defined by the temper grade. The temper grade is represented by a target value of Rockwell T hardness (HR30T), which is classified into T1-T6 in case of single-rolled products and into DR8-DR10 in case of double-rolled products represented by a target value of hardness (HR30T) and a target value of proof stress measured in a rolling direction.
Recently, the high-speed operation for can formation was progressed with the consumption of greater amount of drink cans and hence it became demanded to develop steel sheets suitable for the high-speed can formation. In the steel sheet for can, therefore, it was required to severely control not only the accuracy of the hardness but also dimensional precision and flatness of the steel sheet, lateral bending of steel strip and the like as compared with steel sheets for automobile.
On the other hand, a rationalization based on the reduction of can weight using a steel sheet of a thin thickness became recently a large tendency with the advance of the can formation technique even in can bodies such as 3-piece can and 2-piece can.
When the thickness is made thin, it is naturally impossible to avoid the lowering of the can strength. For this end, it is attempted to improve the can strength by changing a shape of a can through neck-in work, multistage neck-in work, smooth drastic neck-in work or the like or further to conduct the strengthening through deep drawing work, stretch work, bulging work, bottom doom work or the like after painting and baking.
In the production of 2-piece can, it tends to make the can height higher (i.e. increase of drawing ratio) for the increase of the content in addition to the can weight reduction.
From these recent situations, it is demanded to possess properties being conflicting in the conventional thought, which are high strength, very thin thickness, and excellent can formation workability and deep drawing workability as a steel sheet for the can. And also, in order to establish these properties, it is more important to improve the thickness precision and control the change of workability.
Furthermore, the painting of coil or lamination of film on the coil was recently put into practice, so that in order to efficiently conduct lamination operation for a body plate of, for example, 3-piece can, there was adopted a method of continuously laminating a film on a steel strip in a longitudinal direction and cutting out into a body plate per can unit through shearing or slitting. In this method, the film was laminated so as to render weld portion of the can body into the rolling direction (the height direction of the can is the rolling direction of the steel sheet), but in order to laminate the soft film at given set position with a high accuracy while rewinding the steel sheet, the demand of lateral bending accuracy and flatness of the steel strip became further severe
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Aratani Makoto
Aratani Masatoshi
Kuguminato Hideo
Okada Susumu
Okuda Kaneharu
Kawasaki Steel Corporation
Wyszomierski George
LandOfFree
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