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Al-Zn-Mn alloy profile for rail transit vehicle body and preparation method thereof

A technology for rail transit and alloy profiles, applied in the fields of metal materials and their processing, and aluminum alloy processing, which can solve the problems of low alloy toughness, fatigue resistance and stress corrosion resistance, hydrogen and slag content cannot be effectively controlled, and it is difficult to meet high-speed EMU and other problems, to reduce the tendency of cracking and deformation, reduce the amount of head and tail removal, and improve the service life

Active Publication Date: 2018-07-06
广西南南铝加工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the high-strength and high-weldability Al-Zn-Mg alloy produced industrially at present, the content of impurities is high, and the content of hydrogen and slag cannot be effectively controlled, resulting in low toughness, fatigue resistance and stress corrosion resistance of the alloy, which is difficult to meet the requirements of high-speed EMUs. need

Method used

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  • Al-Zn-Mn alloy profile for rail transit vehicle body and preparation method thereof
  • Al-Zn-Mn alloy profile for rail transit vehicle body and preparation method thereof
  • Al-Zn-Mn alloy profile for rail transit vehicle body and preparation method thereof

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Effect test

Embodiment 1

[0033] A method for preparing a high-strength, toughness, and corrosion-resistant Al-Zn-Mg aluminum alloy profile for a rail transit car body comprises the following steps:

[0034](1) Smelting: Mix various raw materials according to the mass percentage, the chemical composition is: Zn4.4%, the mass percentage ratio of Zn and Mg is 3.2; Cu0.1%, Mn0.3%, Cr0.16%, Ti0 .04%, Zr0.12%, Fe≤0.12%, Si≤0.06%, and the balance is Al. Heat to 760°C to melt the material and keep it warm for 5 hours; add Al-Ti-C as the master alloy for grain refinement.

[0035] (2) Degassing and filtering: Degas the molten aluminum after degassing, and then filter to remove the insoluble matter in the molten aluminum;

[0036] (3) Casting: pour the degassed and filtered aluminum liquid, cool it to room temperature, and obtain a round ingot with a diameter of 390mm;

[0037] (4) Soaking heat treatment: place the cast ingot in a soaking furnace for heating and heat preservation, and perform homogenizing hea...

Embodiment 2

[0044] A method for preparing a high-strength, toughness, and corrosion-resistant Al-Zn-Mg aluminum alloy profile for a rail transit car body comprises the following steps:

[0045] (1) Melting: Mix various raw materials according to the mass percentage, the chemical composition is: Zn: 4.6%, the mass percentage ratio of Zn and Mg is 3.5; Cu: 0.15%, Mn: 0.4%, Cr: 0.24%, Ti :0.08%, Zr:0.20%, Fe≤0.12%, Si≤0.06%, and the balance is Al. Heat to 780°C to melt the material and keep it warm for 7 hours; add Al-Ti-C as the master alloy for grain refinement.

[0046] (2) Degassing and filtering: Degas the molten aluminum after degassing, and then filter to remove the insoluble matter in the molten aluminum;

[0047] (3) Casting: pour the degassed and filtered aluminum liquid, cool it to room temperature, and obtain a round ingot with a diameter of 580mm;

[0048] (4) Soaking heat treatment: place the cast ingot in a soaking furnace for heating and heat preservation, and perform homog...

Embodiment 3

[0055] A method for preparing a high-strength, toughness, and corrosion-resistant Al-Zn-Mg aluminum alloy profile for a rail transit car body comprises the following steps:

[0056] (1) Melting: Mix various raw materials according to the mass percentage, the chemical composition is: Zn: 4.5%, the mass percentage ratio of Zn and Mg is 3.3; Cu: 0.12%, Mn: 0.32%, Cr: 0.20%, Ti :0.06%, Zr:0.16%, Fe≤0.12%, Si≤0.06%, and the balance is Al. Heat to 770°C to melt the material and keep it warm for 6 hours; add Al-Ti-C as the master alloy for grain refinement.

[0057] (2) Degassing and filtering: Degas the molten aluminum after degassing, and then filter to remove the insoluble matter in the molten aluminum;

[0058] (3) Casting: pour the degassed and filtered aluminum liquid, cool it to room temperature, and obtain a round ingot with a diameter of 460mm;

[0059] (4) Soaking heat treatment: place the cast ingot in a soaking furnace for heating and heat preservation, and perform homo...

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Abstract

The invention belongs to the technical field of metal materials and machining thereof, discloses an Al-Zn-Mn alloy profile for a rail transit vehicle body and a preparation method thereof, and relatesto the technical field of aluminum alloy machining. The alloy comprises the following chemical components of, by mass, 4.4-4.6 % of Zn, 0.1-0.15% of Cu, 0.3-0.4% of Mn, 0.16-0.24% of Cr, 0.04-0.08% of Ti, 0.12-0.20 of Zr, less than or equal to 0.12% of Fe, less than or equal to 0.06% of Si, and the balance Al, wherein the ratio of the mass percentage of the Zn to the mass percentage of the Mg is3.2 to 3.5. The Al-Zn-Mn alloy material prepared through the preparation method has high toughness, corrosion resistance, anti-fatigue and weldable characteristics, and can meet the running requirements of the high-speed rail transit vehicle body.

Description

technical field [0001] The invention belongs to the technical field of metal materials and processing thereof, discloses an Al-Zn-Mg alloy profile for a rail transit car body and a preparation method thereof, and relates to the technical field of aluminum alloy processing. Background technique [0002] The application of aluminum profiles in the field of rail transit can increase the payload of rail vehicles, save fuel, and reduce vehicle maintenance costs. Compared with traditional vehicle manufacturing materials such as weathering steel and stainless steel, aluminum profiles can reduce the weight of the vehicle body by 50%, and have good adaptability to high-speed lines, multi-bend lines, undulating lines and harsh environments, and thus become urban subways, high-speed railways and freight rail rolling stock. At present, aluminum profiles have been widely used in Japan's Tokyo Metro and Shinkansen rail vehicles. Among the four types of railway passenger line EMUs CRH1, C...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C1/026C22C1/03C22C21/10C22F1/002C22F1/053
Inventor 莫宇飞向晶谢尙昇周伟苏智琦李剑邓桂英张新明
Owner 广西南南铝加工有限公司
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