JPS6063348A - Aluminum alloy for rolling - Google Patents

Abstract

PURPOSE:To obtain an Al alloy ingot for rolling forming no firry structure at a conventional rolling speed by properly regulating the ratio of Fe to Si in an AlFe alloy contg. very small amounts of Si, Cu, Ti, Cr and Mn. CONSTITUTION:This Al alloy for rolling is obtd. by regulating the ratio of Fe to Si in an alloy consisting of 0.05-1.0% Fe, 0.05-1.0% Si, <=0.5% Cu, <=0.3% Ti, <=0.3% Cr, <=0.3% Mn and the balance Al with inevitable impurities to Fe%/ Si%>=6.5. By the composition no firry structure is formed at a conventional casting speed, and an Al alloy ingot whose whole region is the internal region of a firry structure is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to an aluminum alloy for rolling.

As an aluminum alloy for rolling, 1 bow・(,1,(15
~1.0%, Sj O, 05-1,0㎜, (1 and further as a component of M+2, 1.5% or less, C1105ゅ, hereinafter Ti, Cr, Mn) For example, each contains O8; 3% or less and unavoidable 11 substances.
, SI XXXXX and 5×XX series aluminum 11 alloys crystallize 1·°\1-17C series intermetallic compounds inside the ingot. (In this application, composition percentage does not indicate weight percentage.) This intermetallic compound is semi-continuous, crystallizes in solid blocks, and often
A unique ingot structure called the intermediate main structure as seen in Fig. 2 and Fig. 2 is generated.

In the figure, A indicates the internal area of the fir tree group 5, and B indicates the external area of the main structure of the fir tree. As shown in Figure 2, its shape is similar to the natural shape of a fir tree, so in this technical field it is called a fir tree.

After rolling the ingot to remove the main structure of this fir, it is anodized, and the wood pattern of If in the ingot is treated.
An fF-like striped pattern appears, and the product cannot be commercialized due to poor visibility. However, once generated, the 4tr structure cannot be sufficiently 'tied' in the subsequent process, so in order to solve this problem, all the fibers must be removed from the internal area of the fir tree: r11 weave. It is desirable to produce a cast ingot or a cast ingot in which all of the ingots are in the lateral main structure.

It is known that the generation of fir-like structure is controlled by the cold cam speed during solidification of the ingot, and if the casting speed is slowed down, the formation of fir-like structure is Organizational internal conflicts are more likely to occur. In addition, if the casting speed is increased, the outer regions of the main structure of the fir will be more likely to develop.

That is, this vertical main structure pattern is A1. −
Due to the difference in solidification rate in each part of the Fc-based intermetallic compound, the FeΔ13 phase, F,
It is known that this is caused by an 11-magnitude change. In general, the Dark Tree 111 inner region consists of F CA 1 electric + F e A, le river, and the outer region consists of F
F3A consists of a 1m phase, and since the electrochemical properties of each phase are different, the electrochemical properties are 1.5%, anodized 4. There is a difference in +f characteristics, and it becomes a lumberjack of lit.

This FcΔ13 sum-) Fe Al , q('rl→1
7(2he l m 4'll metamorphosis is from 乎市和-It
Since it is a variation of the equilibrium sum l, the faster the solidification rate is, the faster it is, and it is not only accelerated by 1, but also accelerated by the presence of the second element. ;+,S
It is known that the addition of elements such as r, Cu, Ni, and V makes it easier for the external realm of the dark organization to develop.

Among these, Ca + Sr + Co + Ni +
The addition of V and the like is very effective, and by adding a small amount, it is possible to obtain an ingot with a pattern of A-shaped fir consisting of the entire outer region at a normal casting speed.

However, the addition of Ca, Sr, C(1, Nj-, V, etc.) may promote contamination of the molten metal, or may be used in general commercial aluminum alloys such as IJ(, I(, not relatively special). Because of the use of such elements, there were disadvantages such as high economic costs and restrictions on the material used as return material.For this reason, the use of additives such as Sl and Mr, which are commonly used, has been disadvantageous. Although it was strongly desired to obtain an ingot without dark main structure through control, the influence of Si and M+ on the main structure of fir had not been properly grasped, The reality is that it is not possible to stably obtain an ingot in which the main structure of JrL is not formed.

In view of this situation, the present inventors conducted a detailed study on the influence of this S on the formation of the main tissue of fir.
The ratio with e is important, and if Fe (%) / Si (%) is small, the external flf'j battle will occur, and if it is large, the internal region will develop, and Fe (%) / Sj ( %) at normal casting speed, it is possible to stably obtain an ingot of (U wood model (m)). Shiriko Hitoshi, 1
1st, 7th.

Namely, Fao, 05-10%, SJo, 05-1.
0%, CuO, 5% or less, ", l', ' j 0, 3
'l, below, C+・0.3% or below, M II O=
3' In an alloy consisting of X1 or less remainder Δ] and unavoidable impurities, the conversion rate of Fe and S' is calculated as Fe (%)/' j3.
By setting 1 (%)≧6゜5, a mass consisting entirely of internal tissue (↑h with no wasted tissue) is stomached at the normal 4. Juzo speed.

The reason for limiting the composition range of each alloy component (91) is as follows.

Fc is 0.05-1.0%, I: 1.05%
To reach the highest level, high-purity metal is required, which is not economical. If it exceeds 1.0%, the corrosion resistance deteriorates, so 1°Sl is not satisfactory, and should be set at 0.05 to 1.0%. In order to control the level of less than 0.05%, high-purity metal is required, which is not economical. 1.0
If it exceeds %, the color tone of the anodic oxide film becomes dark, which is undesirable, and furthermore, the 4-eating property decreases.

In order to increase the strength, Cu is added or is kept at 0.5% or less. As the content decreases by 0.5%, corrosion resistance decreases.

T1 is 0.3
% or less. If it exceeds 0.3%, the effect is saturated, and furthermore, the formation of giant intermetallic compounds deteriorates the formability and corrosion resistance of the anodic oxide film.

Cr is added for the purpose of improving strength and making recrystallized grains finer, but the amount is 0.3% or less. When it exceeds 0.3%, giant intermetallic compounds are formed, which deteriorates the formability and corrosion resistance of the anodic oxide film.

M++ is added for the purpose of improving strength and making it easier to recrystallize grains, but it is limited to 0.3% or less. If it exceeds 0.3%, A1.
Prioritize crystallization of Fa M+i-based intermetallic C products 1. fart]
The crystallization of the −F +3-based gold living space compound disappears, resulting in an alloy that is not subject to the prevention of lateral main structure according to the present invention. In addition, F
The ratio of c (%) and Si (%) is 2.0 + 0.5 x
Ml; X (%)<F'e (%)/S1 (%)<6.
In the range of 5+3+M (%), the casting speed of j:1 is generally 30 to 150 mm/mi, and in the range of I+, fir structure occurs. This invention will be further clarified by the following examples. It will be.

Example i! having the alloy composition shown in Table 1. 'i[Ili'
i”i omnipresent.

The effective bulk speed CtJj shown in Table 2 was produced by semi-continuous casting. ? All the ingots that have been removed are 1 OC 1 plate,
Width + 200111111, length 3500 on'
Cd! rn1. .

500 pieces of each ingot obtained by the above casting from one head
After cutting at the nun position and exposing the slice, the sliced surface was etched with a 10% hydric soda solution for 2.A (after washing, pickling with 30% nitric acid, Current density 2.5) with 15% sulfuric acid / d n
Anodic acid treatment was performed under the electrolytic conditions of 50 minutes for electrolysis time and 15°C for electrolysis temperature. In this way, the JI
The results of observing each sliced surface are shown in Table 2.

Table 2 As shown in Table 2, comparative alloys (11 and 4)
However, the alloy of the present invention did not develop a fir-like structure within the range of the normal building speed.
An ingot was obtained whose entire area consisted of the inner area of fir main tissue.

According to the alloy of the present invention, it is possible not only to suppress the generation of the fir main structure in the aluminum alloy ingot for rolling, but also to suppress the generation of the fir main structure in the aluminum alloy ingot as needed. It has advantages such as eyesight and eyesight.

[Brief explanation of drawings]

The drawing shows a cross section of an aluminum alloy ingot for rolling.
Fig. 1 is a cross-sectional view of the ingot, and Fig. 2 is a longitudinal sectional view of the ingot taken along the line X-X' in Fig. be. Figure 2 Procedural Amendment (October 1, 1981 Patent Application No. 40195 2, Title of Invention 7 Tsuenoko Chotsuki J Aluminum Alloy for Rolling 3, Relationship with the Amendment Person Case Patent Applicant: 1 address: 4-1 Nihonbashi Muromachi, Chuo-ku, Tokyo 103 Associate land name: Sky Aluminum Co., Ltd. September 25, 1980 5, Subject of amendment 6, Contents of amendment ■ No. 1 of the description Add “1. Title of the invention: aluminum alloy for rolling” between the first and second lines of the page. ■ “1. Scope of claims” on the second line of the first page of the specification Correct ``2. Detailed Description of the Invention'' on the 10th line of page 1 of the specification to ``3. Detailed Explanation of the Invention.'' ■In the 7th line of page 10 of the specification, "31. Brief explanation of the drawings" should be corrected to "4. Brief explanation of the drawings."

Claims (1)

[Claims] l, FeO, 05~l, 0%, S, L O, (
15-1-0%, C: u 0 5% + or less, E' i
0, 39! , )y, lower, (2r0.3% or less, Mn0
．． 3°
, j (%) / Si (%).