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High-efficiency low-strontium-consumption 4004 aluminum alloy modification method

A technology of aluminum alloy and aluminum alloy melt, which is applied in the field of aluminum alloy preparation, can solve the problems of 4004 aluminum alloy such as coarse silicon phase, unstable modification effect, and high strontium residue, and achieve stable modification effect, easy operation, and low strontium residue low effect

Pending Publication Date: 2022-07-15
DALISHEN ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used Sr modification methods are: refining: add degassing refining agent at 700-720°C for degassing refining, and remove slag after refining; standing: stand for 10-20 minutes after removing slag; modification: add aluminum at 720-730°C Strontium intermediate alloy modification agent, the addition of Sr element is 0.03-0.1wt%; pouring: pouring after modification is completed, this modification method will cause the problem of coarse silicon phase of 4004 aluminum alloy, the content of strontium added is high, and the modification effect is unstable. There is a problem of high strontium residue, so it is necessary to design a high-efficiency and low-strontium modification method for 4004 aluminum alloy to solve the above problems

Method used

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  • High-efficiency low-strontium-consumption 4004 aluminum alloy modification method

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Embodiment 1

[0029] A 4004 aluminum alloy modification method with high efficiency and low strontium consumption. The steps of the method include: batching calculation and smelting: calculating the addition amount of aluminum ingots and additives according to the chemical composition of 4004 aluminum alloy, and smelting, and the smelting temperature is 700 ℃-730 ℃ , adjust the chemical composition to meet the standard. The total amount of aluminum ingots and additives added in this step is 36643kg;

[0030] In-furnace refining: a "T" type refiner is used, and the refining gas is argon to keep the refiner moving smoothly and slowly in the lower layer of the melt, throughout the melt. The refining time is 30min, and the refining temperature is 710℃-730℃;

[0031] Slag removal: remove the scum in the furnace;

[0032] Metamorphism: Add 30kg of aluminum-strontium alloy block with strontium content of 10%;

[0033] Standing: standing for 1 hour, adjust the temperature in the furnace to a rea...

Embodiment 2

[0040] A 4004 aluminum alloy modification method with high efficiency and low strontium consumption. The steps of the method include: batching calculation and smelting: calculating the addition amount of aluminum ingots and additives according to the chemical composition of 4004 aluminum alloy, and smelting, and the smelting temperature is 700 ℃-730 ℃ , adjust the chemical composition to meet the standard. The total amount of aluminum ingots and additives added in this step is 35506kg;

[0041] In-furnace refining: a "T" type refiner is used, and the refining gas is argon to keep the refiner moving smoothly and slowly in the lower layer of the melt, throughout the melt. The refining time is 30min, and the refining temperature is 710℃-730℃;

[0042] Slag removal: remove the scum in the furnace;

[0043] Metamorphism: Add 30kg of aluminum-strontium alloy block with strontium content of 10%;

[0044] Standing: standing for 1 hour, adjust the temperature in the furnace to a rea...

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Abstract

The invention discloses a high-efficiency low-strontium-consumption 4004 aluminum alloy modification method, which comprises the following steps that a blocky aluminum-strontium intermediate alloy is adopted as a modifier to be added into a 4004 aluminum alloy melt, and the adding amount of the strontium element is 0.008-0.01 wt%, so that the residual quantity of strontium is 0.001-0.003 wt% before casting, aiming at a high-silicon aluminum alloy, the adding amount of Sr and the refining time during smelting are controlled, and the content of strontium in the high-silicon aluminum alloy is controlled. The purpose of alloy structure modification is achieved, a silicon phase is prevented from being in a thick sheet shape or a needle shape, the line size of the silicon phase is controlled to be within 50 microns, a serious cutting effect on a matrix is prevented, the mechanical property of the alloy is improved, and the defects in the composite rolling process are avoided, so that the ideal modification effect is achieved.

Description

technical field [0001] The invention is a 4004 aluminum alloy modification method with high efficiency and low strontium consumption, and belongs to the technical field of aluminum alloy preparation. Background technique [0002] 4004 aluminum alloy is used as the cladding layer of composite aluminum foil with low melting point and good fluidity, and can be used as brazing material under certain temperature conditions. In the process of producing 4004 alloy ingots, due to the high content of silicon in the alloy, the silicon phase is in the form of coarse flakes or needles, which has a serious splitting effect on the matrix and reduces the mechanical properties of the alloy, especially the plasticity, resulting in rolling There are many defects in production. The use of modifiers to refine the silicon phase can avoid the above problems, and sodium salts and Cu-P master alloys are commonly used in the industry for modification. However, the sodium modifier will increase the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22C21/04B22D11/00
CPCC22C1/06C22C1/026C22C1/03C22C21/04B22D11/003
Inventor 曹旷牟大强匡卫明
Owner DALISHEN ALUMINUM
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