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6XXX series aluminium alloy material containing high manganese and chromium for automobile body and preparation method of

A technology of aluminum alloy material and car body, which is applied in the field of high manganese-chromium-containing 6XXX series aluminum alloy material for automobile body and its preparation field, can solve problems such as inability to meet the requirements, and achieve the effect of easy folding and forming and avoiding crushing test rupture.

Active Publication Date: 2019-08-02
D MAG KUNSHAN NEW MATERIAL TECH CO LTD
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Problems solved by technology

However, the alloy composition range of these materials can no longer satisfy the materials used in the modern automobile industry. In particular, major automobile manufacturers have designed a set of material specifications for evaluating materials and various performance indicators, such as AUDI-TL116, BMW-WS02003 and DAMLER-DML4919

Method used

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  • 6XXX series aluminium alloy material containing high manganese and chromium for automobile body and preparation method of
  • 6XXX series aluminium alloy material containing high manganese and chromium for automobile body and preparation method of
  • 6XXX series aluminium alloy material containing high manganese and chromium for automobile body and preparation method of

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[0026] The invention provides a technical solution: high-manganese-chromium-containing 6XXX series aluminum alloy material for automobile body and its preparation method, including 0.55-0.65% Si, <0.3% Fe, <0.15-0.25% Cu, 0.4 -0.5% Mn, 0.6-0.7% Mg, 0.15-0.2% Cr, <0.15% Zn, 0.02-0.05% Ti, 0.6-0.7% Mn+Cr inevitable impurity elements each <0.05% , and the total amount of unavoidable impurity elements is less than 0.15%, and the balance is aluminum.

[0027] Described preparation method comprises:

[0028] Preparation of materials: Prepare with pure metal aluminum, magnesium, copper, Al-Si master alloy, chromium agent, manganese agent, titanium boron agent, titanium boron wire according to the alloy composition.

[0029] Melting and casting: Put the prepared raw materials into the regenerative natural gas melting aluminum furnace for smelting, first add metallic pure aluminum and Al-Si intermediate alloy, and then add metallic copper after melting; add manganese agent and chromiu...

Embodiment 1

[0035] a. Prepare materials: according to the scope of the alloy composition of the present invention, with pure metal aluminum, magnesium, copper, Al-Si master alloy, chromium agent, manganese agent, titanium boron agent, titanium boron wire, according to the Si of composition 0.59%, the Fe of 0.13% , 0.22% of Cu, 0.41% of Mn, 0.68% of Mg, 0.18% of Cr, 0.02% of Zn, 0.03% of Ti, 0.6% of Mn+Cr, unavoidable impurity elements each <0.05%, and not Avoid the total amount of impurity elements < 0.15%, and the balance is aluminum alloy.

[0036]b. Melting and casting: Put the prepared raw materials into the regenerative natural gas melting aluminum furnace for smelting, first add metal pure aluminum and Al-Si master alloy, after melting, then add metal copper; heat up to 740℃~750℃ and add manganese agent , chromium agent, and pure magnesium metal. After these metals are stirred evenly and fully melted, the temperature is raised to 750-760°C, and then the molten aluminum is treated wi...

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Abstract

The invention discloses a 6XXX series aluminium alloy material containing high manganese and chromium for an automobile body and a preparation method of the 6XXX series aluminium alloy material. Mn and Cr elements are added on the basis of JIS-6N01 alloy compositions, the upper limit of Mn + Cr <0.5% is broken, the content is increased to Mn + Cr =0.5-0.75%, the full cross section of a sectional material after extrusion is deformed and not recrystallized, and thus the grain boundary precipitation phase is reduced to the greatest extent. Therefore, the probability of fractures along the grain boundary during a crushing test of the sectional material is reduced, the situation that the crushing test fractures facilitate easy folding and forming is avoided, and the folded surface does not produce orange skin or wrinkles.

Description

technical field [0001] The invention relates to the technical field of nonferrous metals, in particular to a 6XXX series aluminum alloy material containing high manganese and chromium for automobile bodies and a preparation method thereof. Background technique [0002] Exhaust gas (CO 2 ) Emission restrictions and the requirement to continuously reduce energy consumption continue to urge automakers to rapidly move towards lightweight. Among them, replacing steel with aluminum is considered the fastest way to reduce the weight of automobiles. The shell and body of all-aluminum automobiles have generally successfully used aluminum alloy rolled plates, but there are relatively few structural parts using aluminum alloy extruded profiles, mainly such as body structural parts such as anti-collision beams, energy-absorbing boxes, and thresholds. Battery frame for electric vehicles. In addition to high mechanical properties, materials for such structural parts must also have good...

Claims

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Application Information

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IPC IPC(8): C22C21/08C22C21/02C22C1/03C22F1/05
CPCC22C1/026C22C1/03C22C21/02C22C21/08C22F1/002C22F1/05
Inventor 谢郑居涂季冰
Owner D MAG KUNSHAN NEW MATERIAL TECH CO LTD
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