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Method for producing 180 aluminium alloy sections

The technology of an aluminum alloy profile and manufacturing method, which is applied in the field of aluminum alloy profile manufacture, can solve the problems of unstable strength, poor corrosion resistance, and low yield strength of alloy ingots, and achieve reduced crack tendency, high stability, and improved Effect of Base Metal and Weld Quality

Active Publication Date: 2014-08-27
哈尔滨东轻特种材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of unstable alloy ingot strength, low yield strength, low tensile strength, low elongation, poor anti-corrosion performance and poor plasticity existing in the aluminum alloy profile prepared by the existing method, thereby providing a Manufacturing method of 180 aluminum alloy profiles

Method used

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specific Embodiment approach 1

[0020] Specific embodiment one: the manufacturing method of a kind of 180 aluminum alloy profiles in this embodiment is carried out according to the following steps:

[0021] 1. According to the mass percentage of each element, Mg: 4.70% ~ 5.50%, Mn: 0.50% ~ 1.00%, Cr: 0.05% ~ 0.20%, Ti: 0.03 ~ 0.15%, Be: 0.0001% ~ 0.0015%, Zn: ≤ 0.25%, Cu: ≤0.10%, Fe+Si: ≤0.40%, single impurity: ≤0.05%, total impurity: ≤0.15% and the rest Al, weigh pure aluminum ingot, magnesium ingot, aluminum-manganese master alloy , aluminum-chromium master alloy, aluminum-titanium-boron master alloy and aluminum-beryllium master alloy;

[0022] 2. Put the metal weighed in step 1 into the melting furnace for melting, the melting temperature is 700-750°C, and the melting time is 3-5 hours, to obtain the aluminum alloy melt;

[0023] 3. Casting the molten aluminum alloy obtained in step 2 at a casting temperature of 715° C. to 730° C. and a casting speed of 20 to 85 mm / min to obtain an aluminum alloy round ...

Embodiment approach

[0027] This embodiment includes the following effects:

[0028] 1. The 180 alloy prepared in this embodiment is a new alloy developed on the basis of Al-Mg non-heat treatment strengthened aluminum alloy, adding appropriate amount of Mn, Cr, Ti and Be elements and strictly controlling the Fe+Si impurity content;

[0029] 2. The addition of Mn to the 180 alloy prepared in this embodiment can make the precipitation of magnesium uniform, improve the corrosion resistance of the alloy, especially the ability to resist stress corrosion cracking, not only the effect of improving the strength of the alloy is greater than that of magnesium, but also ensure that the alloy It has higher stability. For every 1% Mg added to aluminum, the strength can be increased by about 35MPa, and the addition of the same amount of manganese can increase the strength by about 65-70Mpa, and the effect is almost doubled; improve the recrystallization of the alloy temperature to prevent grain coarsening; man...

specific Embodiment approach 2

[0035] Embodiment 2: This embodiment differs from Embodiment 1 in that: in step 2, the melting temperature is 750° C., and the melting time is 5 hours. Others are the same as in the first embodiment.

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Abstract

A method for producing 180 aluminium alloy sections relates to a method for producing aluminium alloy sections. The method is used for solving the technical problems that the aluminium alloy section which is produced by the prior art has unstable alloy ingot casting strength, low shear strength, weak tensile strength, low elongation percentage, bad corrosion resistance and bad plasticity. The method for producing 180 aluminium alloy sections comprises the following steps of: 1, weighing raw materials; 2, preparing aluminium alloy melt; 3, producing an aluminium alloy round ingot; 4, homogenizing annealing; 5, producing the aluminium alloy section through extrusion forming; and 6, producing the 180 aluminium alloy section. The 180 aluminium alloy section which is produced by the method has the tensile strength of 310-380 MPa, the shear strength of 200-236MPa and the elongation percentage of 16.0-20.0A, and can be applied in the ship field as the ideal material of ship structures, warship radars and the like.

Description

technical field [0001] The invention relates to a method for manufacturing an aluminum alloy profile. Background technique [0002] The Al-Mg series aluminum alloy is a non-heat treatment strengthened aluminum alloy, which has many disadvantages: 1. Since magnesium is the main constituent element of the alloy, the ingot has a large tendency to crack and is easy to form oxides. It is more difficult to control, resulting in unstable alloy ingot strength; 2. Due to the difficulty in nucleation of precipitated items, few cores, large size of precipitated items, and poor aging effect, the yield strength of the alloy is low, usually only 160-200Mpa, and the tensile strength is partial Low, usually only 310Mpa, low elongation, only 16.0A; 3. Magnesium is preferentially anodic term Mg 5 Al 8 or Mg 5 Al 3 It precipitates at the grain boundary, so that the alloy tends to produce intergranular cracks and stress corrosion, and the anti-corrosion performance is poor; 4. The impurity ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/06C22C1/03C21D8/00C22F1/047
Inventor 张燕飞刘科研刘记伟王国军高新宇潘哲马琳
Owner 哈尔滨东轻特种材料有限责任公司
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