High-strength aluminum alloy sheet
An aluminum alloy plate, high-strength technology, applied in the field of Al-Mg-Si aluminum alloy plate, can solve the problems of limited strength, incapable of high temperature, insufficient strength, etc., and achieve the effect of improving BH property and increasing strength
Inactive Publication Date: 2018-01-02
KOBE STEEL LTD
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Problems solved by technology
[0014] However, the control of these conventional aspect ratios is aimed at improving the formability of the above-mentioned panel material, but the strength is insufficient for the above-mentioned skeleton material or reinforcement material.
[0015] On the other hand, even if the temperature of the artificial aging treatment is increased to increase the strength, from the viewpoints of treatment efficiency, cost, deterioration of the baked paint, strength reduction due to overaging, etc., artificial aging (hardening) ) There are limits and restrictions on the temperature of the treatment, and there are also cases where it cannot be heated at high temperature. The strength after BH is limited
Method used
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[0104] Next, examples of the present invention will be described. 6000-series aluminum alloy plates having different structures defined by the aspect ratio of the present invention were produced by changing the composition and production conditions. Thereafter, the As yield strength, BH property (coating bake hardenability), and bending workability were measured and evaluated after the plate was kept at room temperature for 100 days after manufacture. The results are shown in Tables 1 and 2.
[0105] Specifically, the separate production method is to change the soaking conditions, hot rough rolling start temperature, solution treatment temperature, and other conditions as shown in Table 2 for the 6000-series aluminum alloy plate with the composition shown in Table 1. to proceed. Here, in the representation of the content of each element in Table 1, the numerical value of each element is displayed as a blank, indicating that the content is below the detection limit.
[0106]...
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Abstract
According to this invention, by increasing the aspect ratio of the crystal grains in an Al-Mg-Si aluminum alloy sheet having a composition that includes one or more elements from among Mn, Cr, and Zrand satisfies 0.6 <= ([Mg] / [Si]-0.15[Mn]-0.3[Cr]-0.1[Zr]) <= 1.8, the strength of the aluminum alloy sheet after artificial aging treatment such as paint baking treatment (after bake hardening) is significantly higher and satisfies the required hardness for use as an automobile structural member without reducing bending workability.
Description
technical field [0001] The present invention relates to an Al-Mg-Si series aluminum alloy plate. The aluminum alloy sheet referred to in the present invention refers to a rolled sheet such as a hot-rolled sheet or a cold-rolled sheet, which is formed into a structural member to be used after undergoing quenching and tempering (T4) such as solution treatment and quenching treatment. The previous aluminum alloy plate. In addition, in the following description, aluminum is also called aluminum and Al. Background technique [0002] In recent years, social demands for weight reduction of vehicles such as automobiles have been increasing from the perspective of the global environment and the like. In order to meet this demand, as materials for automobiles, in addition to steel materials such as steel sheets, aluminum alloy materials with excellent formability and coating bake hardening ability (hereinafter also referred to as BH properties) and lighter weight Applications are i...
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IPC IPC(8): C22C21/06C22C21/02C22F1/05
CPCC22C21/02C22C21/08C22F1/05C22C21/06
Inventor 宍户久郎松本克史有贺康博
Owner KOBE STEEL LTD