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High-strength steel sheet for can manufacturing and process for manufaturing the sheet

A manufacturing method and high-strength technology, applied in manufacturing tools, furnace types, furnaces, etc., can solve the problems of increasing martensite particle size, inability to take into account strength and ductility, etc., to improve hardenability, strength, and high strength. and ductility effects

Active Publication Date: 2010-08-11
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And if the alloy composition is reduced to pass ASTM, the grain size of martensite increases
For these reasons, it is impossible to apply the DP technology of steel sheets for automobiles to high-strength thin steel sheets for cans, and it is impossible to balance strength and ductility

Method used

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  • High-strength steel sheet for can manufacturing and process for manufaturing the sheet
  • High-strength steel sheet for can manufacturing and process for manufaturing the sheet
  • High-strength steel sheet for can manufacturing and process for manufaturing the sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0069] The steel with the composition shown in Table 1 was smelted, and for the steel plates A1-S1 manufactured under the manufacturing conditions shown in Table 2 and Table 3 (continued from Table 2), the state of martensite, the formula The calculation results on the left, 30T hardness, and elongation were evaluated.

[0070]

[0071]

[0072]

[0073] Here, regarding the state of martensite, the martensite was identified by LePera (レペラ-) etching, and image analysis was carried out on at least 100 fields of view with a field of view of 0.2 μm × 0.2 μm with a 1000-magnification optical microscope to obtain Martensite fraction (the area ratio of martensite in the structure). In addition, regarding the martensite grain size, the circle-equivalent diameter was calculated by the same measurement and averaged.

[0074] About hardness, it evaluated based on 30T of JISZ2245. If the 30T hardness is less than 60, the strength is insufficient when used for the...

Embodiment 2

[0077] Under the manufacturing conditions shown in Table 4 and Table 5 (continued from Table 4), the steel with the composition shown in Table 1 was made into steel plates A21~Q22, and the martensitic state of the steel plate, formula The calculation results on the left, martensite ultra-fine Vickers hardness, 30T hardness, and elongation were evaluated.

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Abstract

The invention provides a high-strength steel sheet for can manufacturing which is improved in both strength and ductility while clearing the ASTM regulations and is thus excellent in workability. A high-strength steel sheet of 0.1 to 0.5 mm in product sheet thickness (t) for can manufacturing which has a composition containing by mass C: 0.04 to 0.13%, Si: more than 0.01% to 0.03%, Mn: 0.1 to 0.6%, P: 0.02% or below, S: 0.03% or below, Al: 0.01 to 0.2%, and N: 0.001 to 0.02% with the balance consisting of Fe and unavoidable impurities and a ferrite-base ferrite-martensite composite structure, characterized by having a martensite fraction of 5 to less than 30%, satisfying the relationship wherein d is martensite grain diameter ([mu]m) and t is product sheet thickness (mm), and exhibiting a 30T hardness of 60 or above. 1.0 < (1 - EXP(-t x 3.0)) x 4 / d... .

Description

technical field [0001] The present invention relates to a high-strength thin steel sheet for can making used as a raw material for food cans and beverage cans and a method for producing the same. Here, the high-strength thin steel sheet refers to a thin steel sheet with a tensile strength of 590 MPa or more. Background technique [0002] As steel sheets for can making, cold-rolled thin steel sheets having a product sheet thickness t of 0.1 to 0.5 mm are generally used. As a steel plate for can making, the higher the strength, the thinner the plate thickness t of the product, and therefore, as high a strength as possible is required. [0003] Therefore, in the past, high-strength thin steel sheets for cans were generally produced by the secondary cold rolling method. This method, for example, as described in Japanese Patent Publication No. 38-8563 and Japanese Patent Application Publication No. 8-5039, is to anneal the steel plate after the first cold rolling, and then carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/06C22C38/54
CPCC22C38/02C22C38/06C22C38/04C22C38/001
Inventor 冈本力竹内聪友清寿雅
Owner NIPPON STEEL CORP
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