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High-strength aluminum alloy extruded material having excellent surface qualities

A high-strength, aluminum alloy technology, applied in the field of high-strength aluminum alloy extrusion materials, can solve the problems of insufficient strength and reduced surface quality, and achieve the effect of excellent surface quality and high strength

Pending Publication Date: 2021-11-02
MA铝株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is a problem that the strength of these extruded 6000 series aluminum alloys is not necessarily sufficient for structural material applications such as bumper and frame materials, which are further promoting higher strength.
[0003] In addition, for these 6000-series extruded materials, if the Si content or Mg content is increased for the purpose of higher strength, there is a problem that the surface quality after extrusion, such as pick up, decreases.

Method used

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  • High-strength aluminum alloy extruded material having excellent surface qualities
  • High-strength aluminum alloy extruded material having excellent surface qualities
  • High-strength aluminum alloy extruded material having excellent surface qualities

Examples

Experimental program
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Effect test

Embodiment

[0088] Hereinafter, although an Example is shown and this invention is demonstrated in more detail, this invention is not limited to these Examples.

[0089] According to the semi-continuous casting method, an aluminum alloy ingot with a diameter of 230 mm having the composition shown in Table 1 and Table 2 was produced, and after homogenizing the obtained ingot at 540° C. for 4 hours, it was taken out from the furnace. Forced air cooling with fans. These billets for extrusion are heated to 510°C in an induction heating furnace for hot extrusion, and extrusion processing is performed on flat plates with a width of 150 mm and a wall thickness of 2 mm and round tubes with an outer diameter of 70 mm and a wall thickness of 2 mm. After that, it is produced by rapid cooling based on water cooling immediately.

[0090] The obtained aluminum alloy extruded material was aged at 190° C. for 5 hours.

[0091] "Determination of Tensile Yield Strength"

[0092] According to JISZ2241, t...

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Abstract

An aluminum alloy extruded material having excellent surface qualities, provided by the invention, is characterized by having a composition that contains, by mass%, 0.55% to 0.70% of Si, 0.10% to 0.35% of Fe, 0.15% to 0.60% of Cu, 0.20% to 0.40% of Mn, 0.70% to 0.8% of Mg, 0.01% to 0.10% of Ti, and more than 0.1% but no more than 0.20% of Zr, with the Mg2Si content in stoichiometric composition being 1.10% to 1.26% , the excess Si content being 0% to 0.27%, and the remainder consisting of aluminum and unavoidable impurities, wherein the aspect ratio of crystal grains in the extrudate is 5 or more.

Description

technical field [0001] The invention relates to a high-strength aluminum alloy extruded material with excellent surface quality. Background technique [0002] Extruded materials made of JIS-specified 6000-series aluminum alloys such as 6063, 6N01 (6005C), and 6061 in which Mg and Si are added to Al are known as bumpers, bumper reinforcement materials, or frame materials for automobiles. However, there is a problem that these extruded 6000-series aluminum alloys do not necessarily have sufficient strength for structural material applications such as bumpers and frame materials, which are further promoting higher strength. [0003] In addition, in these 6000-series extruded materials, if the Si content or Mg content is increased for the purpose of higher strength, there is a problem that the surface quality after extrusion such as pick-up decreases. [0004] For example, an energy absorbing member is described in the following Patent Document 1, which has a composition that c...

Claims

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Application Information

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IPC IPC(8): C22C21/08
CPCC22C21/08C22F1/00C22C21/02C22C21/06C22F1/05
Inventor 大芝敏晃吉井章福增秀彰
Owner MA铝株式会社
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