JPS6365745B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Field The present invention is for manufacturing hard rolled sheets of non-heat-treated aluminum alloy suitable for packaging container materials such as can stock, end materials, cap materials, mini-darling materials, and other drawing materials. It is about the method. BACKGROUND ART Conventionally, as a method of manufacturing a hard plate using a non-heat-treated aluminum alloy for packaging containers, for example, an AA3004 aluminum alloy material for the body material of DI cans,
Many methods have been proposed for reducing the selvage rate or improving the strength. The most common of these methods is agglomeration →
The process consists of homogenization treatment → hot rolling → (cold rolling if necessary) → annealing → final cold rolling. On the other hand, heat-treated aluminum alloys can be heated up to 100℃.
Components that cause fine precipitation at 200℃ include Mg,
Contains Si and Cu. After heating this alloy material to a high temperature of 500°C or higher, it is rapidly cooled to form a solid solution of the alloy components, and then the strength can be increased by heating it to a temperature of 100 to 200°C and performing a precipitation treatment. well known. This is the so-called heat treatment of heat-treatable alloys. Problems to be Solved by the Invention In the method for producing a non-heat-treated aluminum alloy hard plate, in order to reduce the selvage ratio of the hard plate, the conditions of homogenization treatment, hot rolling, and intermediate annealing are controlled and , it is important to reduce the amount of reduction in the final cold rolling, and on the other hand, to improve the strength, it is important to select the chemical composition and intermediate annealing conditions, and to increase the amount of reduction in the final cold rolling. It is known. As described above, the properties of the hard plate differ depending on the amount of reduction in the final cold rolling, so it is difficult to produce a hard plate with excellent formability and strength using conventional methods. Ta. In addition, as the weight of DI cans has been reduced, the thickness of the material used has become thinner, and as a result, the reduction amount of cold rolling is large in the manufacturing method of hard plates.
The formability of this hard plate began to deteriorate. The present invention solves the above-mentioned problems in the conventional method for manufacturing a non-heat-treated aluminum alloy hard plate, and is a method for manufacturing a non-heat-treated aluminum alloy hard plate for forming that has excellent strength and formability. The purpose is to provide Means for Solving the Problems The present invention is configured as follows as a means for achieving the above object. That is, the present invention provides a method for manufacturing a hard rolled aluminum alloy plate with excellent formability, using Mg:
0.20-6%, Si: 0.10-1%, Cu: 0.05-0.30%
Contains, or in addition to the above, Mn: 0.20 to 2%,
Using an aluminum alloy containing Zn: 0.005 to 0.2% and the balance being substantially Al, ingot formation, homogenization treatment, and hot rolling are sequentially performed by a normal method, followed by intermediate annealing, or After performing cold rolling, intermediate annealing is performed, and then cold rolling is performed once or twice or more including the final cold rolling to produce a hard plate of the aluminum alloy. Rolling at a reduction rate of 20% or more, and
When cold rolling is carried out at 100°C to 200°C and at least one cold rolling is performed after intermediate annealing and before final cold rolling, each cold rolling is carried out at a temperature lower than 100°C. The above configuration will be explained below. The present inventors investigated the relationship between the temperature of cold rolling after intermediate annealing, the state of fine precipitation, and the processed structure in the conventional manufacturing method of hard plates of non-heat-treated aluminum alloys, and found that the cold working temperature It was discovered that this affects the formability of hard plates. That is, although the aluminum alloy used in the present invention is not heat-treated, when it is used and subjected to normal intermediate annealing, Mg, Mg,
A portion of Si and Cu is fixed, and the subsequent cold rolling and the resulting temperature rise cause fine precipitation of the solid-dissolved components. For example, when cold rolling is performed at 100℃ or higher, Mg-Si, Mg-Cu, Mg-Si
-Intermetallic compounds such as Cu and Mg-Cu-Zn are finely precipitated. This fine precipitation has a negative effect on the formability of the hard plate. In particular, if further cold rolling, for example final cold rolling, is performed in this state, the formability will further deteriorate. The present invention was created based on the above knowledge, and uses an alloy having the above-mentioned specific composition, and performs final cold rolling (finish rolling) at 100°C to 200°C after intermediate annealing.
It is characterized by performing the cold rolling at a temperature lower than 100°C, and depending on the case, performing the cold rolling once or twice or more between the intermediate annealing and the final cold rolling. By performing the final cold rolling at 100°C to 200°C, the fine precipitation of alloying components progresses, giving the hard plate the necessary strength, and the processed structure caused by the previous cold rolling. Recovery (release of internally accumulated strain) occurs, which improves formability. However, when the rolling temperature becomes higher than 200°C, the strength actually decreases. 100 like this
What can be done at ℃~200℃ is simple _H3N treatment,
In other words, this corresponds to performing stabilization treatment at a low temperature. As a result, a hard plate whose properties are stable against changes over time can be obtained. Further, by performing cold rolling after intermediate annealing at a temperature lower than 100° C., a cold-worked structure in which fine precipitation of alloy components is prevented can be obtained. This contributes to improving the formability of the hard plate. If cold rolling after intermediate annealing is carried out in two or more times as necessary, only the final cold finish rolling is carried out at 100℃ to 200℃, and the previous cold rolling is carried out at several times. In any case, it is necessary to carry out all operations at a temperature lower than 100°C. In carrying out the present invention, the cold rolling temperature can be set by adjusting the cold rolling reduction rate, rolling speed, and amount of coolant. Mn and Zn may be added to the composition of the aluminum alloy used in the present invention in order to further increase the strength or control the selvage ratio. Example 1 Si: 0.17%, Fe: 0.40%, Cu: 0.16%, Mn:
1.2%, Mg: 1.1%, Zn: 0.02%, Al: The remaining aluminum alloy was made into an ingot using the usual method, and after homogenizing it at 580℃ x 10 hours, it was hot rolled to a thickness of 1.6mm. It was made into a board. Then, intermediate annealing was performed at 430°C. Subsequently, when rolling the plate to a final thickness of 0.4 mm, the thickness was changed from 1.6 mm to 0.8 mm in the first cold rolling, and from 0.8 mm to 0.4 mm in the second final cold rolling, and Rolling was carried out while changing the cold rolling temperature for the second time as shown in Table 1 below. The properties of the 0.4mm hard plate manufactured by each example are as follows:
As shown in Table 1.

[Table] As can be seen from Table 1, the temperature of the first cold rolling is lower than 100℃, and the temperature of the second cold rolling is lower than 100℃.
The formability of the hard plate obtained by rolling at 100℃ or higher is good, but the first cold rolling temperature is 100℃ or higher.
℃, and the second cold rolling temperature was lower than 100℃, the formability of the hard plate deteriorated. Furthermore, if the second cold rolling is performed at a temperature higher than 200°C, sufficient strength will not be obtained in the hard plate. Example 2 Si: 0.20%, Fe: 0.42%, Cu: 0.14%, Mn:
0.36%, Mg: 0.33%, Zn: 0.05%, Al: The remaining aluminum alloy was made into an ingot using the usual method, and after homogenizing it at 580℃ x 10 hours, it was hot rolled to form a 4mm thick plate. It was then cold rolled to a thickness of 1.5 mm. Intermediate annealing was performed at 480°C at that thickness.
Continued cold rolling from 1.5mm to 0.65mm and from 0.65mm to
The test was carried out in two sessions, each with 0.25 mm. The temperature for each test was as shown in Table 2. 0.25 obtained by each example
The properties of mm hard plates are shown in the same table.

【table】

[Table] As is clear from Table 2, according to the present invention, the first cold rolling was carried out at a temperature lower than 100°C, and the second
A hard plate obtained by performing the final cold rolling at a high temperature of 100° C. or higher has good strength and formability. On the other hand, in all of the comparative examples, the cold rolling temperature did not meet the conditions according to the present invention, so the moldability was poor. Example 3 Si: 0.14%, Fe: 0.22%, Cu: 0.5%, Mn:
0.11%, Mg: 4.7%, Zn: 0.02%, Al: The remaining aluminum alloy is made into an ingot using the usual method.
After homogenizing at 500℃×10Hr, hot rolling
I made it into a 2.5mm thick plate. Intermediate annealing at 360℃ at that thickness
It was carried out in Continue cold rolling from 2.5mm to 1.2mm
→ 0.6mm → 0.3mm 3 times. The temperature for each test was as shown in Table 2. 0.3 obtained by each example
The properties of mm hard plates are shown in the same table.

[Table] As is clear from Table 3, the hard plate obtained by each round of cold rolling according to the present invention has good strength and formability, but in the comparative example, the formability decreased. ing. Example 4 Si: 0.65%, Fe: 0.45%, Cu: 0.27%, Mn:
1.0%, Mg: 1.7%, Zn: 0.10%, Al: The remaining aluminum alloy was made into an ingot using the usual method, and this was made into a 0.5 mm thick plate by hot rolling and cold rolling. Intermediately annealed. Subsequently, it was finished into a 0.3 mm hard plate by just one cold rolling. The cold rolling temperature at this time and the properties of the hard plates of each example are shown in Table 4.

[Table] As can be seen from Table 4, even if cold rolling is not performed after intermediate annealing and before final cold rolling, the hard plate obtained by performing final cold rolling at 100°C or higher according to the present invention The moldability is good, but in Comparative Example Y, which was carried out at 100°C or lower, the moldability decreased and
In Comparative Example Z, which was carried out at a temperature exceeding 200°C, the strength decreased. Effects of the Invention According to the present invention, a stabilized hard plate with excellent formability and strength can be produced by cold rolling using a non-heat-treated aluminum alloy. This hard plate is particularly suitable for packaging container materials such as can stock.

Claims (1)

[Claims] 1 Mg: 0.20-6%, Si: 0.10-1%, Cu:
Contains 0.05-0.30%, or in addition to the above, Mn:
Using an aluminum alloy material containing 0.20 to 2%, Zn: 0.005 to 0.2%, and the balance being substantially Al,
Either ingot formation, soaking treatment, and hot rolling are performed sequentially by a normal method, followed by intermediate annealing, or cold rolling is performed, intermediate annealing is performed, and then cold rolling including final cold rolling is performed. once or twice
The final cold rolling is performed at a rolling reduction rate of 20% in manufacturing the hard plate of the aluminum alloy by repeating the process more than once.
above and at 100°C to 200°C, and if cold rolling is performed more than once after intermediate annealing and before final cold rolling, each cold rolling is carried out at 100°C to 200°C.
A method for producing a hard rolled aluminum alloy plate with excellent formability, characterized by carrying out the process at a lower temperature.