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A production process of high-strength 7-series aluminum alloy pipe

A production process, aluminum alloy technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of strength, plasticity, toughness, fatigue resistance, corrosion resistance, etc.

Active Publication Date: 2020-10-20
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a high-strength 7-series aluminum alloy pipe production process in order to solve the problem that the strength, plasticity, toughness, fatigue resistance, and corrosion resistance of the 7-series aluminum alloy pipe cannot be coordinated and enhanced in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A production process of high-strength 7-series aluminum alloy pipes, comprising the steps of:

[0027] A. Ingredients: aluminum alloy ingots are made according to the following mass percentages:

[0028] element Zn Mg Cu Zr mn Cr Ti B Al content 8.0 1.5 0.15 0.08 0.2 0.1 0.05 0.05 margin

[0029] Single impurity ≤ 0.05%, total impurity ≤ 0.15%;

[0030] B. Smelting: Put the prepared aluminum alloy raw materials in a melting furnace to smelt liquid aluminum alloy, and melt and cast the liquid aluminum alloy into aluminum alloy ingots. The temperature of the liquid aluminum alloy after melting is 700°C. The ingot temperature is 200°C, and the cooling rate of the liquid aluminum alloy is 40°C / min;

[0031] C. Two-stage homogenization treatment: The aluminum alloy ingot after melting is subjected to two-stage homogenization treatment to eliminate grain segregation in the aluminum alloy ingot. The two-stage homogenization system is...

Embodiment 2

[0037] A production process of high-strength 7-series aluminum alloy pipes, comprising the steps of:

[0038] A. Ingredients: aluminum alloy ingots are made according to the following mass percentages:

[0039] element Zn Mg Cu Zr mn Cr Ti B Al content 8.0 2.0 0.20 0.1 0.8 0.15 0.05 0.05 margin

[0040] Single impurity ≤ 0.05%, total impurity ≤ 0.15%;

[0041] B. Smelting: Put the prepared aluminum alloy raw materials in a melting furnace to smelt liquid aluminum alloy, and melt and cast the liquid aluminum alloy into aluminum alloy ingots. The temperature of the liquid aluminum alloy after melting is 700°C. The ingot temperature is 200°C, and the cooling rate of the liquid aluminum alloy is 40°C / min;

[0042] C. Two-stage homogenization treatment: The aluminum alloy ingot after melting is subjected to two-stage homogenization treatment to eliminate grain segregation in the aluminum alloy ingot. The two-stage homogenization system is t...

Embodiment 3

[0048] A production process of high-strength 7-series aluminum alloy pipes, comprising the steps of:

[0049] A. Ingredients: aluminum alloy ingots are made according to the following mass percentages:

[0050] element Zn Mg Cu Zr mn Cr Ti B Al content 8.0 2.2 0.16 0.2 1.0 0.2 0.05 0.05 margin

[0051] Single impurity ≤ 0.05%, total impurity ≤ 0.15%;

[0052] B. Smelting: Put the prepared aluminum alloy raw materials in a melting furnace to smelt liquid aluminum alloy, and melt and cast the liquid aluminum alloy into aluminum alloy ingots. The temperature of the liquid aluminum alloy after melting is 700°C. The ingot temperature is 200°C, and the cooling rate of the liquid aluminum alloy is 40°C / min;

[0053] C. Two-stage homogenization treatment: The aluminum alloy ingot after melting is subjected to two-stage homogenization treatment to eliminate grain segregation in the aluminum alloy ingot. The two-stage homogenization system is ...

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Abstract

The invention belongs to the technical field of heat treatment of aluminum alloy, and relates to a production technology of a high-strength 7-series aluminum alloy pipe. An aluminum alloy ingot casting is prepared from the following raw materials according to the mass percentage: 7.5-8.5% of Zn, 1.0-3.5% of Mg, 0.10-0.20% of Cu, 0.05-0.3% of Zr, 0.1-1.5% of Mn, 0.05-0.3% of Cr, 0 .05% of Ti, 0.05%of B, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of impurities in total and the balance Al. The two-stage homogenizing treatment and the two-stage aging heat treatment are adopted in the production technology of the aluminum alloy pipe, wherein according to the two-stage homogenizing system, the heat preservation is carried out for 24 hours at the temperature of 470 DEG C, and the heat preservation is carried out for 10 hours at the temperature of 480 DEG C; and according to the two-stage aging system, the heat preservation is carried out for 7 hours at the temperature of 110 DEG C to 130 DEG C, and the heat preservation is carried out for 10 hours at the temperature of 165 DEG C to 170 DEG C. The overall mechanical property of the high-strength 7-series aluminum alloy pipe is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy heat treatment, and relates to a production process of high-strength 7-series aluminum alloy pipes. Background technique [0002] The 7-series aluminum alloy is a heat-treatable alloy with excellent properties such as high strength, high toughness, and corrosion resistance. It is widely used in aerospace, military equipment, and related civil industries. Its performance mainly depends on the internal organization, grain boundary configuration and the type, size and shape of the precipitated phase. Therefore, it is of great practical significance and use value to adjust the microstructure of aluminum alloys through heat treatment and fully tap the potential of 7-series aluminum alloys to meet the high-performance requirements of aluminum alloys in aerospace and other high-tech fields. On the basis of improving its strength, it is an inevitable trend to improve its plasticity and toughness, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053C21D9/08B21C23/08
CPCB21C23/085C21D9/08C21D9/085C22C21/10C22F1/002C22F1/053
Inventor 鞠浩然张悦李佳宁钟伟柱何平王迪刘旭东边虹锟
Owner CHINA ZHONGWANG
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