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Aluminum alloy sheet for forming

An aluminum alloy plate and compound technology, which is applied in the field of Al-Mg-Si series aluminum alloy plates for forming, can solve the problems of inability to improve the panel strength and decrease the BH property, and achieve the effect of improving the BH property and promoting the diffusion.

Inactive Publication Date: 2017-04-19
KOBE STEEL LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0008] Furthermore, the following problems also arise: in the case of such a large room temperature aging, the BH property is lowered, and the yield strength remains unchanged by heating during a relatively low-temperature artificial aging (hardening) treatment such as a coating and baking treatment of the formed panel. Cannot be raised to the strength required as a panel

Method used

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  • Aluminum alloy sheet for forming
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Examples

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Embodiment

[0095] Hereinafter, examples of the present invention will be described. 6000-series aluminum alloy sheets having different Sn solid solution amounts specified in the present invention were prepared according to the above intermediate annealing conditions, and the number densities of the above compounds and the Sn solid solution amounts based thereon were investigated. Furthermore, the BH properties (coating bake hardenability) and hemming workability of the boards after being kept at room temperature for 100 days were also evaluated. The results are shown in Table 2.

[0096] The specific production conditions of these aluminum alloy plates are as follows. Aluminum alloy ingots of the respective compositions shown in Table 1 were melted together by the DC casting method. At this time, in each example, the average cooling rate during casting from the liquidus temperature to the solidus temperature was set to 50° C. / min. In the display of the content of each element in Table...

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Abstract

The present invention pertains to an Al-Mg-Si based aluminum alloy sheet for forming, that contains 0.2-2.0% of Mg, 0.3-2.0% of Si, and 0.005-0.3% of Si (all amounts given with respect to mass), the balance comprising Al and unavoidable impurities, wherein the aluminum alloy sheet for forming is characterized in that the structure of the aluminum alloy sheet is such that the average number density of compounds having a circle-equivalent diameter within a range of 0.3-20 [mu]m as measured by SEM at 500 times magnification is more than 0 / mm2 but not more than 5,000 / mm2, and of the compounds measured by SEM, the average count ratio of compounds that contain 0.5% by mass or more of Sn as identified using an X-ray spectrograph, is 0% or more but less than 50%. This aluminum alloy sheet for forming exhibits high BH properties and good workability.

Description

technical field [0001] The invention relates to an Al-Mg-Si aluminum alloy plate for forming. The aluminum alloy sheet referred to in the present invention is a rolled sheet such as a hot-rolled sheet or a cold-rolled sheet, and refers to an aluminum alloy sheet that has been subjected to quenching and tempering such as solution treatment and quenching treatment and before baking, coating and hardening treatment. alloy plate. In addition, aluminum is also called Al in the following description. Background technique [0002] In recent years, society has increasingly demanded weight reduction of vehicles such as automobiles in consideration of the global environment and the like. In order to meet this demand, as a material for automobile panels, especially large body panels (outer panels, inner panels) such as hoods, doors, and roofs, instead of steel materials such as steel plates, formability and bake coating hardening The application of aluminum alloy materials with exce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/06C22F1/00C22F1/05
CPCC22C21/02C22C21/06C22F1/00C22F1/05C22F1/043C22F1/047C22C21/08
Inventor 有贺康博宍户久郎松本克史
Owner KOBE STEEL LTD
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