6000 aluminum extrudate excelling material of good paint-baking hardenability and process for producing the same

An aluminum extrusion and extrusion molding technology, applied in the field of 6000 series aluminum extrusion materials, can solve the problems of increasing yield strength and decreasing yield strength, and achieve the effect of sufficient yield strength

Inactive Publication Date: 2009-01-28
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case, the yield strength of such alloys increases after natural aging compared to the yield strength immediately after extrusion, and the yield strength after aging treatment Reduced strength

Method used

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  • 6000 aluminum extrudate excelling material of good paint-baking hardenability and process for producing the same
  • 6000 aluminum extrudate excelling material of good paint-baking hardenability and process for producing the same
  • 6000 aluminum extrudate excelling material of good paint-baking hardenability and process for producing the same

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Embodiment

[0056] Examples and comparative examples of the present invention are described below.

[0057][Manufacturing method: (1) Hold at 90±50°C×1 to 24 hours immediately after extrusion molding]

[0058] First, the raw material content was adjusted to achieve the composition of the 6000-series aluminum alloy as shown in Sample Nos. 1 and 2 listed in Table 1. The raw materials were dissolved and melted into cylindrical ingots (diameter: 204 mm x length: 700 mm) with dimensions suitable for extrusion. In addition, the alloy contents listed in Table 1 are expressed as analytical values. Significant digits are expressed as the value "0.00%". Then, the ingot was homogenized at 560° C. for 4 hours.

[0059] Next, the homogenized ingot (billet) was extrusion-molded using an extrusion die at a predetermined extrusion temperature (billet heating temperature) under the cooling conditions listed in Table 2. As a result, each has figure 2 Extruded aluminum profiles for frame member cross-s...

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Abstract

The present invention relates to a 6000 aluminum extrudate containing, by mass, 0.3-0.7% magnesium, 0.7-1.5% silicon, 0.35% or less copper, 0.35% or less iron and 0.005-0.1% titanium, and further containing 0.05-0.30% manganese, 0.10% or less chromium and 0.10% or less zirconium provided that at least one transition element selected from among mentioned manganese, chromium and zirconium is contained in a total amount of 0.05-0.40%, and still further containing the balance aluminum and unavoidable impurities, characterized in that the proof strength thereof is increased as much as 60 MPa or more by a thermal history equivalent to paint baking while the proof strength thereafter is set for 180 MPa or greater. This aluminum extrudate excels in paint-baking hardenability to such an extent that the proof strength applicable to structural members of automobile, etc. can be realized by the thermal history equivalent to paint baking.

Description

technical field [0001] The present invention relates to a 6000-series aluminum (Al-Mg-Si alloy) extruded material excellent in paint-bake hardenability, whose yield strength is improved when subjected to a heat history equivalent to paint-bake and when subjected to quenching and tempering treatment can be increased. The invention is useful for components that are subjected to a thermal history equivalent to a paint bake, such as vehicle (eg, automobile) components, including frame components such as side members, side members, cross members, and door frames. Background technique [0002] In recent years, aluminum alloys used for components of automobiles and the like are gaining attention for the protection of the global environment. However, aluminum is more expensive per unit weight than steel. In the case of aluminum, the weight is reduced while the component costs tend to be more expensive at the same time. Therefore, when aluminum alloys are used for automobile compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02B21C23/00C22C21/06C22F1/043C22F1/00
CPCB21C23/002C22C21/06C22C21/02C22F1/00C22F1/043
Inventor 青野雅路宫木利孝吉田朋夫
Owner TOYOTA JIDOSHA KK
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