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Aluminum alloy plate and process for producing the same

A technology of aluminum alloy plate and manufacturing method, which is applied in the field of aluminum alloy plate and its manufacture, can solve problems such as high Mg content, insufficient miniaturization of Al-Mg intermetallic compounds, and difficulty in balancing and averaging strength and ductility, and achieves The effect of improving the balance of strength and ductility

Inactive Publication Date: 2008-01-16
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the current twin-roll continuous casting method, as described later, is a casting method in which a lubricant is coated on the rolls. Therefore, depending on the position of the plate, the solidification rate is likely to be insufficient, and the higher the Mg content , the greater the impact on the increase of large-grain segregation and small-grain segregation
Therefore, in the current twin-roll continuous casting method, the Mg content is increased, and there is also a problem that it is difficult to average the strength and ductility balance of the Al-Mg-based Al alloy sheet within the same sheet.
[0017] Therefore, in order to improve the press formability of the above-mentioned actual outer and inner panels of the high-Mg Al-Mg-based Al alloy sheet produced by the twin-roll continuous casting method, only the crystal grains of the above-mentioned Patent Documents 1 and 2 are made finer. , and it is not sufficient to refine the Al-Mg intermetallic compound or reduce the coarse structure

Method used

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Examples

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Effect test

Embodiment 1

[0104] Next, Embodiment 1 of the present invention will be described. Al-Mg-based Al alloy melts (inventive examples A to M and comparative examples N to X) with various chemical composition compositions shown in Table 1 were cast into each of Plate thickness (3 ~ 5mm). Furthermore, these Al alloy cast thin plates were cold-rolled to a plate thickness of 1.5 mm. In addition, each of these cold-rolled sheets was subjected to final annealing and cooling in a continuous annealing furnace under the conditions shown in Table 2. The average grain size on the surface of the Al alloy sheets obtained in these inventive examples and comparative examples was all in the range of 30 to 60 μm.

[0105] Here, the rotational speed of the twin rolls during twin roll continuous casting was 70 m / min, and the pouring temperature when pouring the Al alloy melt onto the twin rolls was the liquidus temperature + 20°C, which were constant in each example. Lubrication of the surface of the twin rol...

Embodiment 2

[0137] Next, Embodiment 2 of the present invention will be described. The various chemical compositions shown in Table 1 are composed of Al-Mg alloy melts (invention examples A~I, comparative examples J~M), which are cast into plate-shaped ingots (each plate thickness : 3 ~ 5mm). Furthermore, cold-rolled sheets (each sheet thickness: 1.5 mm) were produced from each plate-shaped ingot (Al alloy cast sheet) by the type of casting method shown in Table 2 under the specific process conditions shown in Table 3. Except for Comparative Example 13, the average crystal grain size on the surface of the Al alloy sheets obtained in these Invention Examples and Comparative Examples was in the range of 30 to 60 μm.

[0138] Here, the rotational speed of the twin rolls during twin roll continuous casting was 70 m / min, and the pouring temperature when pouring the Al alloy melt onto the twin rolls was the liquidus temperature + 20°C, which were constant in each case. Lubrication of the surfa...

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PUM

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Abstract

The present invention provides an Al-Mg series alloy sheet of high-Mg with improved press formability and homogeneity which can be applied to automobile outer panels and inner panels. This is an Al-Mg series aluminum alloy sheet having 0.5 to 3 mm in thickness cast by twin-roll continuous casting and cold rolled, comprising over 8% but not more than 14% Mg, 1.0% or less Fe, and 0.5% or less Si with the remainder being Al and unavoidable impurities, wherein the mean conductivity of the aluminum alloy sheet is in the range of at least 20 IACS% but less than 26 IACS%, the strength-ductility balance (tensile strength x total elongation) as a material property of the aluminum alloy sheet is 11000 (MPa%) or more, and the homogeneity and press formability of the sheet have been improved.

Description

technical field [0001] The present invention relates to an aluminum alloy plate and a manufacturing method thereof, which is an Al-Mg-based aluminum alloy plate containing high Mg obtained by continuous casting, which has an excellent balance of strength and ductility and excellent formability. Background technique [0002] In recent years, in the field of the body of transport aircraft such as automobiles, fuel efficiency improvement due to weight reduction has been pursued in response to global environmental problems caused by exhaust gas and the like. Therefore, the use of aluminum alloy materials such as rolled plates and extruded profiles, which are lighter in weight, in place of conventionally used steel materials for automobile bodies is increasing. [0003] Among them, the use of Al-Mg-based aluminum for the outer panels (outer panels) and inner panels (inner panels) of automotive panel panels (panel structures) such as cover panels, fenders, roofs, and trunk lids is...

Claims

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Application Information

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IPC IPC(8): C22C21/06B22D11/00B22D11/06C22F1/047
Inventor 森下诚松本克史安永繁信稻叶隆
Owner KOBE STEEL LTD
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