JPS58126967A - Manufacture of hard aluminum alloy plate having low directional property - Google Patents

Abstract

PURPOSE:To obtain a hard Al alloy plate having low directional properties, high strength and a very low edge forming rate by specifying the ratio of (Fe+Mn)/ Si in an Al alloy for a can and the heat treatment conditions. CONSTITUTION:An alloy consisting of 0.5-2.0% Mn, 0.5-2.0% Mg, 0.05-0.5% Cu, 0.2-0.7% Fe, 0.01-0.3% Ti and the balance Al with impurities or further contg. one or more among 0.01-0.3% Cr, 0.001-0.05% B, 0.01-0.3% V and 0.01-0.2% Zr and satisfying (Fe+Mn)/Si>=14 is heated to 450-600 deg.C at >=100 deg.C/ min heating rate, immediately cooled at >=100 deg.C/min cooling rate, and subjected to final cold rolling at >=20% draft. By regulating the ratio of (Fe+Mn)/Si to >=14, many effective coarse particles of an Al-Fe-Mn compound are dispersed, the reduction of the strength after baking finish is prevented, and the burning hardening can be accelerated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a hard aluminum alloy plate with low grain orientation, and more specifically, the present invention relates to a method for manufacturing a hard aluminum alloy plate with low grain orientation, and more specifically, to produce a hard aluminum alloy sheet with low grain orientation, which has an extremely low selvage rate when molding a canvas body such as a can for a beer soft drink. This invention relates to a method for manufacturing alloy plates.

Currently, aluminum family cans are widely used,
There are major problems such as: jlochi, (1)
Huge amount of power consumption during aluminum metal production (2)
Advancement of steel ironed cans (3) Due to issues such as the collection of cans, there are growing demands for thinner, harder can body materials and reduced trimming amounts. In addition, when producing aluminum ingots, ingots are enlarged, wide rolled, or
Efforts are being made to make this process more efficient, such as by using a continuous annealing method.

Therefore, under these circumstances, the following i-properties are required for aluminum canvas body materials.

(o) High 9IJ degree, especially high strength after baking coating (2) Low selvage rate (bidirectionality) and excellent drawing workability (3) Excellent ironing workability .

In addition, it is important that the material has excellent corrosion resistance and surface condition II (baked pattern).

Furthermore, the aluminum canvas body material currently used is mainly 3004 alloy of AA standard, and its content and component ratio are 0.8 to 1.3% Mg.

Mn 1.0-1.5 s, Cu O, 25% or less, FeO, 716 or less, sio, 3% or less, Zn0.2
5 or less, the remainder consists of aluminum.

Usually, this alloy is homogenized and annealed at a temperature of 500°C or higher, and then hot pressed or further cold rolled into a coil t, 4.
A hard aluminum plate is produced by batch annealing at a temperature near 00°C for several hours, cold rolling to a desired thickness, and annealing at a temperature near 150°C for several hours as necessary.

However, in recent years, continuous annealing methods (continuous annealing furnaces) have been adopted due to rationalization of manufacturing methods, and attempts are being made to apply them to intermediate annealing before and after final cold rolling, as well as final annealing. Therefore, it has not been possible to produce a fully satisfactory hard aluminum alloy plate with low orientation even if continuous annealing is used in the conventional method of producing aluminum alloys with the same content and proportions. .

The present invention solves the various disadvantages and shortcomings in the conventional method of manufacturing aluminum canvas body materials described above, and in particular lowers the selvage rate, reduces the trimming cost, and The present invention provides a method for producing a hard aluminum alloy plate with high strength and low orientation.

A low directional hard aluminum alloy according to the present invention.

The manufacturing method is Mn015~2.0L Mg0.5~
2. OL Cu O, Ob~0.5%, F'eQ, 2%
~0,7s+'riα01~ (contains L3s,
And, an aluminum alloy rolled material having f;'e + Mn /Si of 14 or more and the balance consisting of aluminum and impurities is heated at a heating rate of 100°C/- or more to 450 to 6o.

℃, immediately cooled at a cooling rate of 100℃/- or more, and then subjected to final cold rolling at a rolling reduction of 20% or more. As the first invention, further K, Mn 0.5~
2.0%, Mg 0.5-2.0%, CuO,05
~0.5qb, Fecl, 2~I], 7%, Ti0
．． 01~0.3%, CrO,01~(L3L
BcL001-0.05%, Vo, 01-0.3%.

ZrO, one or two selected from 01-0.2s
Contains more than 14% Fe+Mn/s4
As described above, the aluminum alloy compacted material consisting of the balance aluminum and impurities was heated to 450 @ at a heating rate of 100°C or more.
Heating to a temperature of ~600°C, immediately cooling at a cooling rate of 100°C/- or more, then Ilk at a rolling rate of 2o or more
The present invention is a combination of two inventions, the second invention being a method for manufacturing a low-directional hard aluminum alloy plate characterized by performing final cooling [i].

The manufacturing method of the low-directional hard aluminum alloy plate according to the present invention will be described in detail below (hereinafter also simply referred to as the manufacturing method according to the present invention).

First, dP regarding the components and component ratios of the aluminum alloy used in the manufacturing method according to the present invention.

I will clarify.

Mg is an element that increases strength and imparts not only solid solution hardening but also precipitation hardening through baking treatment, and when the content is 0.5
If the content is less than 2.0%, this effect will not be obtained, and if the content exceeds 2.0%, ironing processability will deteriorate.

Therefore, the Mg content is set to a5 to 2.0.

Like Mg, Mn increases strength and is an effective element for controlling directionality, but if it is less than 0.5%, At-Mn
-Fe-based precipitates are reduced, making it difficult to control directionality, making it easier to cause t# and N during ironing, and 2.
If the content exceeds 0%, giant compounds are formed and the ironing processability, elongation and lunge properties are deteriorated. Therefore, the Mn content is set to 0.5 to 2.0.

Cu interacts with Mg and becomes fi, 1-Cu during baking coating.
- An element that generates Mg-based fine precipitates and promotes bake hardening; if the content is less than 0.05 capsules, this effect will not occur;
If the content exceeds 5%, the selvage rate will increase and the corrosion resistance will decrease. Therefore, the Cu content is (LO5~α5
Be arrogant.

lj'e is an element that reacts with Mn to form At-Mn-Fe-based precipitates to prevent rough skin and prevent seizure during ironing, but if the content is less than 02-, this effect is If the content is too small and exceeds 0.7 tatami, a giant compound will be formed during casting. Therefore, the Fe content is 0.2~
0.7 duck.

Ti is effective in refining the casting structure and improving the directionality of hot rolled sheets; if it is less than 0.011, it is ineffective, and if it is Q, 5% or more, a giant compound is produced during casting.

Therefore, the Ti content is set to 0.01 to α3.

Crt Be V+ Zr is an element that prevents surface roughness and strength reduction after baking painting, and the content is unknown → hCr
This effect is small at less than 0.01-, less than 80.001, less than 7001 tatami, and less than Zr0.01S;
rO, 3%, BαOEI, Vo, 3%, Zr0.216
If the content exceeds f, a giant compound will be formed and the grain processability will be deteriorated. Therefore, the content is CrCLOf~0.
3. BO, 001~0.05s, V[], 01~G,
3%, and Zr0.01 to 0.2%.

To explain the relationship between Fe + Mn/S i, Si
Although it is permissible to contain at least 0.2% of At-Mn-84 during homogenization, if it is contained as an impurity and it is impossible to eliminate it completely. Since fine precipitates are likely to occur, the content must be less than 0.2%, which is the limit as an impurity, and ht-M
To remove the bad image 11 of n-8i-based fine precipitates, Si
The content must be lowered and at the same time the ratio of Fe+Li4-Si must be 14 or more. Incidentally, the inventor A
As a result of a comparative study of the effects on strength and ironing workability of t-Mg-Mn-based aluminum alloys using both batch-type annealing and continuous-type annealing methods,
It is contained as an impurity. It was discovered that Si reacts with Mn, the main element contained, to form fine precipitates during homogenization treatment, thereby improving the directionality of the hot rolled sheet.

At-Mn-8t, which is such a fine precipitate,
In order to prevent the adverse effects of system precipitates, it has been found that it is effective to disperse a large number of coarse At-Fe-Mrl compounds that are relatively easily generated during homogenization treatment.

Therefore, it has been confirmed that by setting the ratio of pe-)-Mn/Si to t14 or more, the directionality of the final cold-rolled material is significantly reduced when continuous annealing is employed. It was also confirmed that increasing the ratio of Fe-I-Mn/Si is effective in preventing a decrease in strength after baking and, conversely, promoting baking hardening.

Next, heat treatment in a manufacturing method according to the present invention will be explained.

That is, an aluminum alloy ingot having the above-mentioned components and proportions is heated at a temperature of 500° to 600°C at least 2 times.
After homogenization for more than 1 hour, hot rolling, cold rolling if necessary, heating at a heating rate of 100°C/- or more to 450''~600°C, and immediately 100°C/-
Cooling is performed at the above cooling rate to, for example, 100° C. or less.

In this case, if the heating rate and cooling rate are less than 100°C/-, there is no effect on improving the directionality, and the heating temperature reached is 45°C/-.
At temperatures below 0°C, hardening during baking will not occur, and
At temperatures exceeding ℃, there is a risk of softening. Then, after cooling, cold rolling is performed at a rolling rate of 2096 or more to produce a hard aluminum alloy plate. If this cold rolling rate is less than 20%, the pressure resistance and buckling resistance of the aluminum campody will be insufficient.

It should be noted that the higher the soaking temperature, hot rolling temperature, and continuous annealing temperature, the lower the directionality of the material and the better the bake hardenability.

Next, an example of the method for manufacturing a low-directional hard aluminum alloy plate according to the present invention will be described.

Example 1 An aluminum alloy ingot having the ingredients and proportions shown in Table 11 was homogenized at 550°C for 12 hours, hot rolled from 500mm to 4mm thick, and then cold rolled. 1
．． The thickness should be 0. Two samples were made for both the present invention and the comparative material, one of which was annealed at 370°C for 2 hours, and the other one was annealed at 370°C for 2 hours.
Immediately after heating to 500℃ at a heating rate of 00℃/-
It was cooled to 100°C or less at a cooling rate of 1000°C/-. Thereafter, it was further cold rolled to a thickness of α4■, and the directionality, workability during graining, and pressure resistance were investigated, and the results are shown in Table 2.

No. 211 As is clear from Table 2, those with a high Fe/Mn/si ratio and subjected to continuous annealing have low directionality and excellent workability during graining. Furthermore, it is noteworthy that the directional behavior is opposite between the batch annealing method and the continuous annealing method, and the material properties change rapidly if the annealing method is different. That is, Fe
By increasing the +Mn/Si ratio, it is possible to obtain a hard aluminum alloy plate with low directionality, which was not possible with conventional materials.

An aluminum alloy ingot having the ingredients and proportions shown in Table 1 was homogenized at 590°C for 10 hours, hot rolled to a thickness of 4.0 gcm, and then cold rolled to a thickness of 1.0 gcm. ■ After making the thickness, intermediate annealing is performed in a continuous annealing furnace with a heating rate of 1000℃/■ and a reaching temperature of 500℃, immediately cooled at a cooling rate of 1000℃/-, and cold rolled to a thickness of 0.4m. I did this. Table 2 shows the results of the strength, directionality, and strength after phosphorization treatment at a temperature of 200° C. in this case.

As is clear from Table 2, by increasing the ratio of Fe+Mn/Si, a low-oriented aluminum alloy plate with a lower selvage ratio than conventional material 2 can be obtained, and by containing Cu, It can be seen that stretching hardening has occurred.

The selvage ratio in this case is the drawing ratio (blank diameter/punch diameter) 1.
This is the result of measurement from a cup squeezed at 65, and all ears are seen in the 45' direction.9.

As explained above, since the method for manufacturing a low-directional hard aluminum alloy plate according to the present invention has the above-mentioned configuration, it has high strength, especially after baking coating,
It is possible to make a hard aluminum alloy plate with a low selvage rate (and also low orientation and excellent ironing workability).

Patent applicant: Kobe Steel, Ltd. Agent Patent Attorney Ryo Hisashi Maruki 1 Tighten

Claims (1)

[Claims] (xl MnO, 5-2.OL Mgl), 5-2
．． 0L Cu0.05~0.5L)' e O,
An aluminum alloy rolled material containing 2 to 0.7 L T r O-01 to 0.3% and having F'e+VI/Si of 14 or more and the balance consisting of aluminum and impurities is heated at 100°C/Vi or more. A low-oriented hard aluminum alloy plate, characterized in that it is heated to 1 MIfK at 4soL6oo°C at a heating rate of 4soL6oo°C, immediately cooled at a cooling rate of 100°C/100°C or more, and then subjected to final cold rolling at a rolling reduction of 20% or more. manufacturing method. (2), vln O, 5-2.0%, Mg
0.5~2.0L Cu 0.05~0.5L
T'e O, 2-0.7%, T i O, 01-0
．． Contains 3%, crL3.01-0.3%, Bo
, 001-0.05s vc, +, 01-0.3s. One or two selected from Zr0.01-0.2%
Contains the species 'F, l- (7, and Fe +r1ys i
14 or more, and the balance consists of aluminum and impurities), alloy pressure sail material is heated to a temperature of 45°C to 600°C at a heating rate of 100°C or more, and then immediately cooled at a cooling rate of 100°C/dawn. A method for producing a hard aluminum alloy sheet with low orientation, characterized in that the final cold rolling is then carried out at a rolling reduction of 20% or more.