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Aluminum alloy sheet with excellent formability

An aluminum alloy sheet and formability technology, which is applied in the field of Al-Mg-based aluminum alloy sheets, and can solve problems such as insufficient suppression measures

Inactive Publication Date: 2011-12-28
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, in Patent Document 1, the step-like serrations are made as slight as possible (the description of the evaluation of the step-like serrations according to the examples of Patent Document 1), and therefore, parallel bands, which are one of SS marks, cannot be completely formed. to suppress
On the other hand, in the recent large-scale body panels, especially the outer panels where the appearance is important, the level of surface quality requirements is more stringent, and in these Patent Documents 1 and 2, the suppression measures for the occurrence of SS marks are not sufficient.

Method used

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  • Aluminum alloy sheet with excellent formability
  • Aluminum alloy sheet with excellent formability
  • Aluminum alloy sheet with excellent formability

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Embodiment Construction

[0035] Hereinafter, each requirement will be specifically described with respect to the embodiment of the present invention.

[0036] (organize)

[0037] The inventors of the present invention found that when Zn is contained in an Al—Mg-based aluminum alloy sheet, it has an effect of suppressing the occurrence of SS marks. At the same time, however, it has also been found that even Al-Mg-based aluminum alloy sheets having the same Zn content have a large difference in the effect of suppressing the occurrence of SS marks. From this, it is considered that not only the inclusion of Zn has an influence on the occurrence state of SS marks, but also the structure state of the Al-Mg-based aluminum alloy plate, that is, the existence form of MgZn clusters (precipitates) that occurs when Zn is contained has an impact on the occurrence of SS marks. Status also makes a big difference.

[0038] Therefore, in order to confirm the existence state of such MgZn-based clusters, the present i...

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Abstract

Provided is an Al-Mg series aluminium alloy plate with less drawing strain mark and excellent formability. In a process of manufacturing the Al-Mg series aluminium alloy plate formed from a composition containing specific Mg and Zn, the quenching and tempering after the final annealing is designed, the EELS power spectrum of the plate for measuring the K loss of the Mg by using an electron energy loss spectroscopy is analyzed, the position of the obtained first adjacent peak value is in a specific range, thereby preventing the drawing strain mark in the extrusion molding under the harsh condition.

Description

technical field [0001] The present invention relates to an Al—Mg-based aluminum alloy sheet that has less occurrence of stretcher strain marks and is excellent in formability. The so-called aluminum alloy sheet in the present invention refers to hot-rolled sheet and cold-rolled sheet, and refers to an aluminum alloy sheet that has been tempered by annealing or the like. In addition, aluminum is also called Al below. Background technique [0002] In recent years, social demands for weight reduction of vehicles such as automobiles have been increasing from the viewpoint of consideration of the global environment and the like. In order to meet this demand, the application of aluminum materials in addition to steel materials such as steel plates has also been studied as materials for automotive panels, especially large body panels (inner panels, outer panels) such as hoods, doors, and roofs. [0003] 5000-series aluminum alloy sheets such as Al-Mg-based JIS5052 alloys and JIS5...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C21/00C22C21/06
CPCC22C21/06C22C21/08C22C2202/00
Inventor 松本克史
Owner KOBE STEEL LTD