Steel sheet for can having high strength and high formability, and method for manufacturing the same

a technology of steel sheets and cans, applied in the field of steel sheets for cans, can solve the problems of difficult to keep at a predetermined temperature, inability to produce thin steel sheets, and above-described conventional technologies, and achieve the effect of improving the formability of steel sheets

Inactive Publication Date: 2013-11-07
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution enables the production of steel sheets with enhanced formability and strength, preventing cracking during rivet forming and flange forming, and allowing for significant thickness reduction, thus addressing the limitations of previous methods and supporting cost-effective can production.

Problems solved by technology

All the above-described conventional technologies have problems as described below.
Regarding the manufacturing method described in Patent Literature 1, it is necessary to reduce the primary cold reduction ratio and, therefore, very thin steel sheet cannot be produced because of the limited finish thickness of hot rolling.
If the finish thickness of hot rolling is reduced, the finish rolling temperature is lowered, so that it is difficult to keep at a predetermined temperature.
Therefore, even in the case where the nitriding treatment is applied in the continuous annealing step, cost increases, e.g., a reduction in line speed and an increase in furnace length, are not avoided.
Consequently, it is not possible to respond to an increase in strength to ensure pressure-resistant strength against thickness reduction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0087]A steel having the component composition as shown in Table 1, where the remainder was Fe and incidental impurities, was prototyped, and a steel slab was obtained through casting. The resulting steel slab was reheated at 1,250° C. and, thereafter, hot rolling and primary cold rolling were applied under the condition shown in Table 2. The finish rolling temperature of the hot rolling was specified to be 890° C., and pickling was applied after the rolling. Subsequently, after the primary cold rolling, continuous annealing at a soaking temperature of 630° C. and a soaking time of 25 seconds and secondary cold rolling under the condition shown in Table 2 were applied. Both surfaces of the steel sheet obtained as described above was subjected to Sn coating continuously, so as to obtain a tin plate with an amount of adhesion of Sn of 2.8 g / m2 per one surface. The test results are shown in Table 2 and Table 3. In this regard, in Table 3, the grain size, the amount of N, and the nitrid...

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Abstract

A steel sheet is provided containing C: 0.070% or more and less than 0.080%, Si: 0.003% or more and 0.10% or less, Mn: 0.51% or more and 0.60% or less, wherein the average grain size is 5 μm or more, the grain elongation rate is 2.0 or less, the difference in hardness is 10 points or more and / or 20 points or more depending on how it is determined, the tensile strength is 500 MPa or more, and the elongation after fracture is 10% or more.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. National Phase application of PCT International Application No. PCT / JP2011 / 077446, filed Nov. 22, 2011, and claims priority to Japanese Patent Application No. 2010-268084, filed Dec. 1, 2010, the disclosures of each application being incorporated herein by reference in their entireties for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to a steel sheet for a can having high strength and high formability and a method for manufacturing the same.BACKGROUND OF THE INVENTION[0003]Among steel sheets used for beverage cans and food cans, steel sheets referred to as DR (Double Reduce) materials may be used for ends, bottoms, bodies of three-piece cans, drawn cans and the like. Regarding the DR material, cold rolling is performed again (secondary cold rolling) after annealing and, therefore, the sheet thickness can be reduced easily as compared with a SR (Single Reduce) material, where only temp...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): C22C38/06C22C38/00C22C38/04C22C38/02B22D11/00B22D11/12
CPCC22C38/06B22D11/001B22D11/12C22C38/04C22C38/02C22C38/001C21D8/0226C21D8/0236C21D8/0268C21D9/46C22C38/002C21D8/0426C21D8/0436C21D8/0468C21D9/48
InventorTADA, MASAKITANAKA, TAKUMIKOJIMA, KATSUMIIWASA, HIROKITOBIYAMA, YOICHI
OwnerJFE STEEL CORP