JPS60251245A - Al-mg-zn type aluminum alloy plate for blind - Google Patents

Abstract

PURPOSE:To obtain the titled Al alloy plate undergoing reduction in the strength at a low rate by coating and baking and having high strength after coating and baking by providing a specified composition consisting of Mg, Zn, Ti, B and Al. CONSTITUTION:This Al-Mg-Zn type Al alloy plate for a blind consists of, by weight, 3.0-5.5% Mg, 0.5-2.0% Zn, 0.01-0.2% Ti and/or 0.002-0.04% B and the balance Al with impurities or further contains one or more among 0.05- 0.5% each of Cu, Mn. Cr, V and Zr. The strength of the Al alloy plate is hardly reduced by coating and baking, and the plate has high strength after coating and baking and produces a significant effect as an Al alloy plate for a blind.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an Al-Mg-Zn aluminum alloy plate for blinds, and more specifically to an Al-Mg-Zn aluminum alloy plate for blinds that has excellent strength after baking the paint. Regarding aluminum alloy plates.

[Prior Art 1 Until now, aluminum alloy plates for blinds have been made of Al
-4,51% Mg-based alloy 5083-H2S plate thickness 15
Although those with a diameter of 0 to 300 μm are used, baking of the paint during the blind manufacturing process reduces the strength during the process.

As a countermeasure to this problem, the board thickness was increased to increase rigidity.

However, the thicker the aluminum alloy plate of the blind, the heavier it becomes, so in order to reduce weight and cost, it is necessary to use as thin a material as possible. There is a demand for aluminum alloy plates, for example, 200 to 23 (1
It has been desired to develop an aluminum alloy plate for blinds which has a lower strength reduction rate than 5083-HI3 due to paint baking by heating at a temperature of 0.9C for 0.5 to 3 minutes, and has high strength.

[Problem to be Solved by the Invention 1] As explained in ``-'', the present inventor has found that the strength reduction rate due to paint burning is smaller than the conventionally used 5083-HF2, and We have developed an AI-M, -Zn-based aluminum alloy plate for blinds with high strength.

1 Means for Solving Problem 1 The Al-Mg-Zn aluminum alloy plate for blinds according to the present invention includes: (1) Mg 3.0-5.5+ut%, ZnO, 5
-2,0wt%, and TiO,01~0.2IIIt%, BO9OO2~0
．． The first invention provides an Al-Mg-Zn-based aluminum alloy plate for blinds characterized by containing one or two types of Mg3.0 to 5.041%, and the remainder consisting of A1 and impurities. 5IIIt%, Zn0,5~
Contains 2.01% and TiO,0l-0,2wt%, BO,002-0,
04+ut%, and further contains CuO,05-0,5u+t%, MnO,05-0
,5u+t,%,CrO,05-0,5IIIt%,
VO, 05-0, 5u+t%, Zr O, 05-0,
From the two inventions, the second invention is an Al-Mg-Zn-based aluminum alloy plate for blinds, characterized in that it contains one or more selected from 5IIIt% and the remainder consists of A1 and impurities. It is what it is.

The Al-Mg-Zn aluminum alloy plate for blinds according to the present invention will be described in detail below.

First, the components and proportions of the Al-Mg-Zn aluminum alloy plate for blinds according to the present invention will be explained.

Mg is an element that increases strength by -1, and the content is 3.
If the content is less than 0u+t%, the strength for blind use will be low, and if the content exceeds 5.5iu1%, the strength will be high but the cold open rolling properties will be poor. Therefore, the nitrogen content is set to 3.0 to 5.5 IIIt%.

When Zn is added to an aluminum alloy containing 3.0-5.5u+t% of MB, baking the paint for 0.5-3 minutes at a temperature of 200-230°C will improve the subsequent strength and reduce the strength loss. It is an element that reduces the size, and the content is 0.5u
Below +t%, this effect is small;
If the content exceeds IIIt%, there is an effect of improving strength, but hot rolling properties and cold rolling properties deteriorate. Therefore, the Zn content is between 0.5 and 2. Ou+j%.

Ti and B are elements that are effective in refining the structure of the ingot and improve hot rolling properties, and the Ti content is 0.01 wt%.
If the B content is less than 0.0021%, this effect will be small, and if the Ti content exceeds 0.2u+t% and the B content exceeds 0.04u+t%, this 4-effect will be saturated. It's a waste of time. Therefore, the Ti content is 0. O]u+t% to 0.2u+t%, B content is 0.
002 to 0.04u+t%.

Cu, Mll, Cr, ■, and Zr are elements that improve the strength after painting baking, and the content is 0.05u+t% each.
If the content is less than 0,5...t%, this effect will be small, and if the content exceeds 0,5...t%, this effect will be saturated and useless. Therefore, the contents of Cu, Mn, Cr, V, and Zr are each 0.05 to 0.5 IIIt%. In addition, Cu.

Mn and Cr also have the effect of secondarily refining crystal grains and improving cold rolling properties.

In addition, unavoidable impurities may be included in addition to the above ingredients, but the impurity is 0.25wt for one ingredient.
% or less, or in the case of multiple, the total is 0.75u+
(Is it necessary to limit the content to t% or less?), this content is within an allowable range without hindering the achievement of the purpose of the Al-Mg-Zn-based aluminum alloy plate for blinds according to the present invention.

[Example 1] Next, an example of an AI-Mg-Zn aluminum alloy plate for blinds according to the present invention will be described.

Example An ingot obtained by melting and casting an aluminum alloy having the components and proportions shown in Table 1 was subjected to facing treatment → homogenization treatment → hot rolling → cold rolling → heat treatment → cold open rolling. After processing in this order, a 150 μm thick Al-Mg-Z for blinds was produced.
It was made into an n-based aluminum alloy plate.

Table 2 shows the material properties and rollability of this aluminum alloy plate before and after painting and baking.

As is clear from Table 2, the aluminum alloy plate according to the present invention 1 has a higher yield strength after paint baking and a smaller rate of strength decline than the comparative alloy 2-5 (183-H2S). I understand.

It can also be seen that Comparative Alloy 1 has a low yield strength after baking and a large strength reduction rate, and Comparative Alloy 3 has a high yield strength after baking but has poor rolling properties.

In Table 2, *1: Strength reduction rate = (σ before heating, 2 σ after heating at 220°C for 1 minute.
2) / Spread before heating. , 2×100×2: Rollability Judging by edge cracking during hot rolling and cold rolling G: Good NG: Severe edge cracking occurs and yield is reduced.

17=257-8-9- [Effect 1 of the invention As explained above, the Al-
Since the Mg-Zn aluminum alloy plate has the structure explained above, the currently used 5083-TR181
Comparison of 200-230'C It is.

−・・−258− -C〇-

Claims (2)

[Claims] (1) Mg 3.0-5,5u+t%, ZnO,5
-2, Ou + t%, and Ti O, 01 to 0.2+++t%, B O, 002 to
An Al-Mg-Zn-based aluminum alloy plate for blinds, characterized in that it contains 0.04u+t% of one or two types, and the remainder consists of A+ and impurities. (2) Mg 3.0-5.5ullt,%, ZnO
,5-2,0IIlt%, and TiO,01-0,2u+t%, B 01002-0
．． Cu0005-0.5ult%, MnO,05-0
,5wt%, CrO, 05~0.5u+t%, VO
,05-0,5u+t%,Zr 0.05-0,5u+
An Al-Mg-Zn-based aluminum alloy plate for blinds, characterized in that it contains one or more selected from the group consisting of t% and the remainder A1 and impurities.