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Aluminum alloy sheet superior in paint baking hardenability and invulnerable to room temperature aging, and method for production thereof

An aluminum alloy plate and plate thickness direction technology, which is applied in the field of aluminum alloy plate and its manufacturing, can solve the problems of reduced panel formability and bending workability, reduced edge folding workability, difficulty in production, etc., and achieves improved baking curability, The effect of improving bending workability

Active Publication Date: 2009-10-07
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The 6000 series aluminum alloy has the advantages of excellent BH properties (fire hardness, artificial aging curability, and baking paint curability). On the other hand, it has room temperature aging properties. When stored at room temperature, age hardening is performed to increase the strength, and there is a problem that the formability of the panel, especially the bending workability, decreases
[0006] However, as in Japanese Patent Application No. 2000-160310, in the rapid cooling of the quenching process, it is very difficult to control the cooling rate with high precision, especially in the continuous heat treatment production line, and it is actually impossible to produce all desired board
In addition, Japanese Patent Application Laid-Open No. 4-147951 only discloses the effects of baking solidification and shape freezing properties after aging at room temperature for at most 1 month. Whether it is effective for the above-mentioned usual room temperature aging of about 1 to 4 months It's not public, it's not clear
Furthermore, Japanese Patent Application Laid-Open No. 6-17208 only discloses the characteristics after aging at room temperature for at most 1 month about the effects of baking solidification and shape freezing, and does not disclose the above-mentioned usual 1 to 4 months. It is not clear whether or so room temperature aging is effective
[0007] In addition, Japanese Patent Application Laid-Open No. 7-18390 does not disclose about room temperature aging at all, and the measuring device for the volume ratio of metal compounds is only known image processing, and the measuring method and conditions are completely unknown, and it is impossible to reproduce or implement it.
Furthermore, in these prior arts, as mechanical properties and formability, only the Ericsson value or LDR (Limited Draw Ratio) is disclosed, but there is no disclosure about bending workability, especially the above-mentioned hemming workability, Impossible to suppress reduction in hemming workability caused by room temperature aging

Method used

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  • Aluminum alloy sheet superior in paint baking hardenability and invulnerable to room temperature aging, and method for production thereof
  • Aluminum alloy sheet superior in paint baking hardenability and invulnerable to room temperature aging, and method for production thereof
  • Aluminum alloy sheet superior in paint baking hardenability and invulnerable to room temperature aging, and method for production thereof

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Embodiment 1

[0097] Embodiments of the present invention are described below. First, as Example 1, 6000-series aluminum alloy plates having different cluster conditions specified in the present invention were produced, and the effects (influence) of the curability of the baking varnish and the aging at room temperature were investigated.

[0098] The 6000 series aluminum alloy plate shown in Table 1 is subjected to homogenization heat treatment (abbreviated as soaking treatment) and hot rolling treatment (abbreviated as hot rolling) according to the conditions shown in Table 2, and then cold rolled to perform solid solution and quenching treatment. In addition, in the expression of the content of each element in Table 1, "-" shows that it is below a detection limit.

[0099] More specific production conditions of the aluminum alloy plate are as follows. Ingots of the respective compositions shown in Table 1 were melted by using the DC casting method. At this time, the average cooling ra...

Embodiment 2

[0125] Then, as Example 2, 6000-series aluminum alloy plates were produced in which the cluster conditions specified in the present invention and the preferred requirements, that is, the average crystal grain diameter and the Mg-Si compound conditions for miniaturization were different, and The effect (influence) of the curability of the baking varnish and the aging at room temperature was investigated. Here, although the press formability and hemming workability tests were performed as in Example 1, the formability test simulated the forming of the outer panel under stricter forming conditions than in Example 1, making these test conditions more severe .

[0126] A 6000-series aluminum alloy ingot with the same composition as shown in Table 1 was melted, homogenized heat treatment and hot rolling were carried out under the conditions shown in Table 4, and cold rolling was also carried out to produce Cold-rolled sheet (coil) with a thickness of 1.0mm. Furthermore, each embod...

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Abstract

An aluminum alloy sheet of specific Al-Mg-Si composition, which, owing to preliminary aging treatment under adequate conditions, has a specific metallographic structure in which there are a large number of clusters of specific size (each being an aggregate of atoms) expressed in terms of number density, which, when observed under a transmission electron microscope of 1,000,000 magnifications, appear as dark contrast in the bright field image. It is superior in paint baking hardenability and is invulnerable to room temperature aging during storage for a comparatively long period of 1 to 4 months.

Description

technical field [0001] The present invention relates to an aluminum alloy plate (hereinafter, aluminum is simply referred to as "Al") having excellent baking varnish curability and suppressed aging at room temperature, and a manufacturing method thereof. The aluminum alloy sheet referred to in the present invention is a plate subjected to solution treatment, quenching treatment, etc. after rolling, and refers to a sheet material for forming before being formed into a panel by press forming or the like. Background technique [0002] The 6000 series aluminum alloy has the advantages of excellent BH properties (fire hardness, artificial aging curability, and baking paint curability). On the other hand, it has room temperature aging properties. When stored at room temperature, age hardening is performed to increase the strength, and there is a problem that the formability of the panel, especially the bending workability, decreases. For example, when a 6000-series aluminum alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/08C22C21/16C22F1/043C22F1/047C22F1/057
CPCC22F1/047C22F1/043C22C21/02C22C21/08
Inventor 高木康夫李光镇
Owner KOBE STEEL LTD
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