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High-strength steel sheet and method for producing same

A high-strength steel plate and manufacturing method technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as high cost, and achieve the effect of excellent ductility and bendability

Active Publication Date: 2020-04-21
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technology described in Patent Document 2 has the problem of having to perform rolling twice, resulting in high cost

Method used

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  • High-strength steel sheet and method for producing same
  • High-strength steel sheet and method for producing same
  • High-strength steel sheet and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] Hereinafter, the actions and effects of the high-strength steel sheet and its manufacturing method of the present invention will be described using examples.

[0083] Steels having the composition shown in Table 1 were melted to produce thin slabs with a thickness of 20 mm. These thin slabs were hot-rolled under the conditions shown in Table 2. The obtained hot-rolled sheets were pickled with hydrochloric acid and cold-rolled at the rolling ratio shown in Table 2 to manufacture cold-rolled steel sheets with a thickness of 0.2 mm. It should be noted that Ti: 0.001%, B: 0.0001%, and Nb: 0.001% in steel type O in Table 1 are unavoidable components mixed.

[0084] Next, the above-mentioned cold-rolled steel sheets were subjected to heating, annealing holding, cooling, and holding after cooling under the heat treatment conditions shown in Table 2 to obtain product steel sheets. The holding after cooling was stopped was performed in a temperature range from the cooling stop...

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Abstract

Provided is a high-strength steel sheet having excellent ductility and bendability, and a tensile strength of at least 500 MPa, specifically a high-strength thin steel sheet which is for cans and hasa sheet thickness in the range of 0.1-0.8 mm. This high-strength steel sheet has a composition containing 0.03-0.15% of C, 0.01-0.05% of Si, more than 0.6% and at most 1.5% of Mn, at most 0.025% of P,at most 0.02% of S, 0.01-0.10% of Al, 0.0005-0.0100% of N, 0.005-0.020% of Ti, 0.0005-0.0100% of B, and 0.0050-0.0200% of Nb, with the remainder comprising iron and inevitable impurities, and has a metallic structure containing at least 85% of ferrite and 1-10% of martensite in area ratio, wherein the martensite grain size is 5 [mu]m or less and the percentage of martensite grains having a grainsize of 2 [mu]m or less is at least 80%.

Description

technical field [0001] The present invention relates to a high-strength steel sheet having excellent ductility and bendability, for example, a tensile strength (TS) of 500 MPa or more, which is particularly suitable for a container material, and a method for producing the same. Background technique [0002] In recent years, in order to reduce the cost of steel sheets for cans, thickness reduction of high-strength steel sheets has been progressing. Specifically, studies have been made on the use of high-strength thin steel sheets having a TS of 500 MPa or more for tanks. [0003] Here, generally, when the strength of the steel sheet is increased, there is a problem that the workability is lowered. For example, in a steel sheet used for a tab, it is necessary to have both the strength that the tab itself does not bend when the can is opened, and the workability, especially the bendability, when it is processed into a tab. In addition, the ring part of the pull tab is a part ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D9/46C22C38/14C22C38/54
CPCC21D9/46C22C38/00C22C38/14C22C38/54C22C38/02C22C38/12C22C38/04C21D8/0236C22C38/32C22C38/28C21D6/005C22C38/001C21D6/004C22C38/002C22C38/06C21D8/0205C22C38/26C21D8/0226C21D8/0263C21D6/008C21D2211/005C21D2211/008
Inventor 椎森芳惠斋藤勇人假屋房亮小岛克己
Owner JFE STEEL CORP
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