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A kind of production technology of 7 series aluminum alloy pipe

A production process and aluminum alloy technology, which is applied in the production process field of 7 series aluminum alloy pipes, can solve the problems of difficult control and high cooling speed, and achieve the effect of reducing energy loss

Active Publication Date: 2020-11-13
CHINA ZHONGWANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a production process for 7-series aluminum alloy pipes in order to solve the problem that the cooling rate of the 7-series aluminum alloy production process without adding Mn element is too high and difficult to control in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A production process of 7 series aluminum alloy pipes, comprising the steps of:

[0028] A. Ingredients: aluminum alloy ingots are made according to the following mass percentages:

[0029] element Zn Mg Cu Cr Zr Ti Al content 4.0 0.6 0.1 0.08 0.12 0.05 margin

[0030] Single impurity ≤ 0.05%, total impurity ≤ 0.15%;

[0031] B. Melting: Put the prepared aluminum alloy raw materials in a melting furnace to melt into a liquid aluminum alloy melt. The melting temperature of the liquid aluminum alloy melt is 720°C. Melting point, high density first, then low density;

[0032] C. Impurity removal: Stir the smelted melt and remove slag to remove large impurities in the molten aluminum. Stir once every 10 minutes, and stir for 10 minutes each time;

[0033] D. Refining: adding sulfate and graphite to the molten aluminum in a ratio of 1:9 by mass to remove magnesium oxide and aluminum oxide in the molten aluminum. The deoxidation tempera...

Embodiment 2

[0042] A production process of 7 series aluminum alloy pipes, comprising the steps of:

[0043] A. Ingredients: aluminum alloy ingots are made according to the following mass percentages:

[0044] element Zn Mg Cu Cr Zr Ti Al content 7.0 1.5 0.2 0.08 0.12 0.05 margin

[0045] Single impurity ≤ 0.05%, total impurity ≤ 0.15%;

[0046] B. Melting: Put the prepared aluminum alloy raw materials in a melting furnace to melt into a liquid aluminum alloy melt. The melting temperature of the liquid aluminum alloy melt is 750°C. The order of adding the aluminum alloy raw materials is first with a high melting point and then with a low temperature. Melting point, high density first, then low density;

[0047] C. Impurity removal: Stir the smelted melt and remove slag to remove large impurities in the molten aluminum. Stir once every 10 minutes, and stir for 10 minutes each time;

[0048] D. Refining: add sulfate and graphite to the molten aluminum ...

Embodiment 3

[0057] A production process of 7 series aluminum alloy pipes, comprising the steps of:

[0058] A. Ingredients: aluminum alloy ingots are made according to the following mass percentages:

[0059] element Zn Mg Cu Cr Zr Ti Al content 7.0 1.2 0.3 0.08 0.12 0.05 margin

[0060] Single impurity ≤ 0.05%, total impurity ≤ 0.15%;

[0061] B. Smelting: Put the prepared aluminum alloy raw materials in a melting furnace to melt into a liquid aluminum alloy melt. The melting temperature of the liquid aluminum alloy melt is 730°C. The order of adding the aluminum alloy raw materials is first with a high melting point and then with a low temperature. Melting point, high density first, then low density;

[0062] C. Impurity removal: Stir the smelted melt and remove slag to remove large impurities in the molten aluminum. Stir once every 10 minutes, and stir for 10 minutes each time;

[0063] D. Refining: adding sulfate and graphite to the molten alumi...

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Abstract

The invention belongs to the technical field of aluminum alloy production and manufacture, and relates to a production technology of 7-series aluminum alloy tubular products. Aluminum alloy ingot casting is prepared from the following components in percentage by mass: 4.0-7.0% of Zn, 0.6-1.5% of Mg, 0.1-0.5% of Cu, less than or equal to 0.1-0.5% of Cr, less than or equal to 0.15-0.25% of Zr, lessthan or equal to 0.1% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurities and the balance of Al. Sulfate and graphite are adopted to be added into molten aluminum liquid according to the mass fraction ratio of 1 to 9-3 to7 in the process of aluminum liquid refining, magnesium oxide and aluminum oxide in the aluminum liquid are removed, the deoxygenation temperature is 720+ / -5 DEG C, therefore, the air cooling speed of aluminum alloy profiles after extruded forming is 100 DEG C / min, and the problems that in the prior art, the production technology of 7-series aluminum alloy with no Mn element added has excessive cooling speed and is not easy to control are solved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy production and manufacturing, and relates to a production process of a 7-series aluminum alloy pipe. Background technique [0002] In the refining of 7-series aluminum alloys, the aluminum of the molten aluminum alloy combines with oxygen in the atmosphere to produce aluminum oxide Al 2 o 3 . In addition, when Mg is contained in an aluminum alloy, it combines with oxygen in the atmosphere to produce magnesium oxide MgO. Al in molten metal 2 o 3 The presence of MgO and MgO reduces the mechanical properties of castings and causes shrinkage cavities. At present, the deoxidation effect is usually achieved by passing sulfate, carbonate or alum into molten aluminum. However, when using these materials for deoxidation, the general temperature is low It needs to be at 760° or higher, so it is necessary to increase the temperature of the molten metal. In order to increase the temperature of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22C1/06C22C21/10C22F1/053B21C37/06
CPCB21C37/06C22C1/026C22C1/03C22C1/06C22C21/10C22F1/053
Inventor 吴海旭杨丽曲凤娇郭雅楠
Owner CHINA ZHONGWANG
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