JPS60200943A - Aluminum alloy having superior strength and workability - Google Patents

Abstract

PURPOSE:To obtain an Al alloy having such high strength that the thickness can be reduced, improved deep drawability and improved surface properties after deep drawing by specifying the amounts of Si, Fe and Mn contained. CONSTITUTION:This Al alloy consists of 0.41-0.80wt% Si, >1.25-1.75wt% Fe, 0.10-0.70wt% Mn and the balance Al with impurities. In the composition, Si inhibits earing by deep drawing and increases the elongation, Fe increases the strength and makes the grains fine, and a little Mn increases the strength and improves the formability. The Al alloy has both strength and ductility and superior formability in a semihardened state as well as in a softened state.

Description

[Detailed Description of the Invention] Technical field This invention relates to an aluminum alloy with excellent strength and workability.
In particular, it relates to an aluminum alloy with excellent deep drawing workability and stretch formability.

Materials for P, P caps, etc. manufactured by conventional deep drawing processing include pure aluminum, Ad-0.8%Fe-0,
A semi-hard material such as a 5% Si alloy is used. These materials have small deep drawing selvages and excellent moldability, but
It does not have sufficient strength and is difficult to make thin. Although the A3003 alloy has high strength, it has the disadvantage that the selvage ratio becomes large during deep drawing.

In addition, soft material pure aluminum such as A1050 and A'1100 is used as aluminum for heat exchangers such as coolers and as overhang fin material, but these materials also have insufficient strength, making it difficult to make them thinner. .

Although there are aluminum alloys for the purpose of improving strength and formability, such as the alloys shown in the following patents, they are still unsatisfactory in terms of properties.

Purpose This invention solves the above-mentioned conventional drawbacks, has sufficient strength to withstand thinning, and has deep drawability (high formability, low selvage ratio) when used as a semi-hard material for camping, for example.
The present invention provides an aluminum alloy with excellent surface properties after deep drawing, and excellent elongation and Erichsen value when used as a soft material for fins.

Composition This invention is SiO, 41-08% (weights, below)
, Fe]25~]-,75% (],,25% not included), Mn0.10~0.70%, remainder, j)
It is an aluminum alloy with excellent strength and workability, consisting of Ad impurities.

The significance of adding each component and the reasons for their limitations are as follows.

Sl: 5iid has the effect of suppressing deep-drawn selvage and increasing elongation, but if it is less than 041%, the selvage suppressing effect is poor and the selvage rate increases. If the content exceeds 0.80%'i, the crystal grains will become large and the workability will be poor. Therefore, the content of 81 is 0.41
~080%.

Fe.

Fe has the effect of increasing the strength of the material and making the crystal grains finer, but if it is less than 125%, the strength increasing effect is poor and the desired strength cannot be obtained. If the content exceeds 175 degrees, embrittlement progresses and elongation cannot be obtained.

Therefore, the content of Fe' (i71.25~1.75% (1
, not included in 25%). Note that from the viewpoint of strength, Fe is preferably 1.3% or more.

Mn: The Mn component has the effect of increasing the strength of the material and improving the formability, but if its content is less than 0.10%, the expected sufficient effect will not be obtained, while if it exceeds 0.70%,
The Mn content was determined to be 0.010% to 0.070% since the formability of the plate, especially the drawing workability, was impaired.

Example 1 The alloy shown in Table 1 was formed into an ingot, soaked at 580°C for 10 hours, the surface cut, and then hot rolled at 525°C to a thickness of 4 mm. This thickness was subjected to intermediate annealing at 380°C for 1 hour, then cold rolled to a thickness of 35 mm, and then subjected to a second intermediate annealing at 480°C for 15 sec.
Added heat treatment.

It was further cold rolled to a final thickness of 0.20 mm. Thereafter, heat treatment was applied at 205° C. x 10 m1, which corresponds to paint baking treatment. Table 1 shows the measurement results of the mechanical properties, selvage ratio, LDII, (limit drawing ratio), and grain size (aS) of the thin plate thus obtained.

From the results shown in Table 1, the present invention alloys Nos. 1 to 6 have greater strength and elongation than the comparative alloys Nos. 7 to 1o, and have finer grains. Also, the LD filter is excellent and the listening rate is small.

Example 2 The same alloy ingot as in Example 1 was hot rolled to 4+nmt and cold rolled to 2t by the same method as in Example], and then intermediate annealed at 380°C x 11 (r). Thereafter, test materials were prepared by cold rolling at a final plate thickness of 0.], 25 mt Kt, and final annealing at 270 °C x 11-1 r.The mechanical properties of these soft thin plates, EV
(Erichsen value) and the measurement results of crystal grain size are shown in Table 2.

From the results shown in Table 2, the present invention alloys 161-G have larger elongation and EV, and have finer crystal grains than comparative alloys 7-10. The strength also shows a high value.

Effects As described above, the aluminum alloy of the present invention has both strength and ductility, and has excellent formability in both semi-hard and soft states.

Improved strength allows products to be made thinner, saving resources and reducing costs. When using a P or P cap, the perforation tearing property when opening the cap is improved, and in the case of soft materials, the yield becomes more flexible and material handling becomes easier.

Claims (1)

[Claims] Si 0.41-0.8% (weight%, same below), Fe
1.25-1.75% (excluding 1.25%),
An aluminum alloy containing 0.10 to 0.70% Mn, with the balance free from 9All and impurities, and having excellent strength and workability.