JPS62122744A - Aluminum alloy ply metal having excellent moldability, baking hardenability and yarn rust resistance - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an aluminum alloy laminate plate with excellent moldability, bake hardenability, and string rust resistance, and more specifically, to use in land transportation vehicles, electrical machinery parts, and parts. Top VD! The present invention relates to an aluminum alloy laminate with excellent moldability, bake hardenability, and thread rust resistance, which is suitable as a material for other products.

[Prior art 1] Conventionally, land transportation vehicles such as cars and buses, and electrical machinery products such as VTRs have been manufactured by applying paint to the surface of aluminum alloy plates to improve design and corrosion resistance after forming. , Furthermore, to improve the performance of the paint,
For example, heating (referred to as baking) is performed at 200° C. for 30 minutes.

Although thread rust is a type of corrosion, it is a corrosion phenomenon that is different from normal corrosion. In other words, when the paint is damaged for some reason, it is corrosion that progresses in the form of threads at the boundary between the material and the paint. This is a corrosion phenomenon that is commonly said to occur, and although improvements have been made to paints and coating methods as a countermeasure, it has not yet been fully resolved.

Aluminum ram alloys used in such fields contain Al 0.4-1.5 wt% Mg 0.3-2.3 in consideration of moldability, bake hardenability, and thread rust resistance.
There is wt%Si-0,3~1,Out%Cu alloy,
This alloy has good formability in the raw material and 20% after forming process.
The bake hardenability by baking at 0°C for 30 minutes is excellent, and this alloy has good string rust resistance after painting among the aluminum alloys in use, but it is not sufficient.

Therefore, there is a demand for an aluminum alloy that has bake hardenability, excellent formability, and thread rust resistance.

[Problem to be Solved by the Invention 1] The present invention was developed in view of the above-mentioned problems regarding thread rust in aluminum alloys, and as a result of extensive research by the present inventors, it was found that bake hardenability is impaired. Without,
In order to suppress the occurrence of string rust, we found that it is better to use an aluminum alloy laminate made of a core material and skin material with specific ingredients and ratios, and based on this knowledge, we improved formability and bake hardening. They developed an aluminum alloy laminate with excellent durability and thread rust resistance.

Means for Solving Problem E] The aluminum alloy laminate sheet of the present invention having excellent formability, bake hardenability, and thread rust resistance has (1) Mg0.4 to
1.5wt%, Si 0.3-2.3wt%, Cu
The core material is an aluminum alloy containing 0.2-1.5 wt% of Mn, the balance consisting of Al and impurities, the skin material is an aluminum alloy containing 0.3-4 wt% of Mn, the balance consisting of Al and impurities, and , an aluminum alloy with excellent formability, bake hardenability, and string rust resistance, characterized in that the skin material has a thickness of 2 to 20% of the total plate thickness on one side, and is coated on one or both sides of the core material. The laminated plate is an invention of fJIJl, (2) Mg 0.4 to 1.5 wt%, Si 0.
3 to 2.3 wt%, Cu 0.2 to 1.5 wt%, and further contains Mn 0.8 wt% or less, Fe 0.5 wt% or less, N
i 0.5wt% or less, Cr 0.4wL% or less, Ti
0.3wt% or less, Zr 0.3wt% or less, Be
0.2wt% or less, V 08ht% or less, B 0.06
An aluminum alloy containing one or more selected from wt% or less, the balance consisting of Al and impurities as a core material, and containing 0.3 to 4 wt% of Mn, the balance consisting of Al and impurities. is used as a skin material, and the thickness of the skin material is 2 to 20% of the total board thickness on one side, and the moldability, bake hardenability, and thread rust resistance are characterized by coating one or both sides of the core material. A second invention provides an aluminum alloy laminated plate with excellent properties, (3) Mg 0.4 to 1.5 wt%, Si 0.
The core material is an aluminum alloy containing 3 to 2.3 wt%, Cu 0.2 to 1.5 wt%, and the remainder Al and impurities, and contains Mn 0.3 to 4 wL%, and further Fe 0.5 wt%. % or less, Mg 005wt% or less,
Cu 0.5wt% or less, Ni 0.5wt% or less・C
r 0.5wt% or less, Zr 0.5wt% or less, V
0.5wt% or less, Si0.5u+L% or less, Zn 0
．． One type or 2f selected from 5wt% or less! 1 or more, and contains 0.3 wt% or less of Ti and 0.06 wt% or less of B.
The skin material is an aluminum alloy containing one or two types of aluminum and the remainder is Al and impurities, and the thickness of the skin material is 2 to 20% of the total board thickness on one side, and is coated on one or both sides of the core material. A third invention provides an aluminum alloy laminated plate with excellent formability, bake hardenability, and thread rust resistance, which is characterized in that: (4) Mg 0.4 to 1. ! 1ost%, Si
0.3 to 2.3 wt%, CuO12 to 1.5 wt%, and further contains Mn 0.8 wt% or less, Fe 0.5 wt% or less, N
i 0.5wt% or less, Cr 0.4~1% or less/Ti
0.3wt% or less, Zr 0.3ait% or less, Be
0.2wt% or less, V 0.3wt% or lessB 0.0
The core material is an aluminum alloy containing one or more selected from 6 wt% or less, the balance being Al and impurities, Mn 0.3 to 4 wt%, and Fe 065 wt% or less, Mg 005wt% or less, C
u 0.5wt% or less, Ni 0.5wt% or less, Cr
005wt% or less, Zr 065wt% or less, V 0
．． 5wt% or less, Si 0.5wt% or less, Zn 0.
Contains one or more selected from 5wt% or less, and Ti 0.3wt% or less, B 0006...t% or less 1
The skin material is an aluminum alloy containing one or two types of aluminum and the remainder is Al and impurities, and the thickness of the skin material is 2 to 20% of the total board thickness on one side, and is coated on one or both sides of the core material. A fourth invention provides an aluminum/7-mum alloy laminated plate having excellent formability, bake hardenability, and string rust resistance, which is characterized by the following: (5) Mg 0.4-1, 5 wt%, Si 0. 3
~2.3wt%, Cu 0.2-2,3wt%, Be
The core material is an aluminum alloy containing 0.2 wt% or less, the balance consisting of Al and impurities, and the aluminum alloy containing 0.3 to 4 wt% Mn, 0.2 wt% or less Be, and the balance consisting of Al and impurities is used as the core material. The material has moldability, bake hardenability, and thread rust resistance, and the skin material has a thickness of 2 to 20% of the total board thickness on one side, and is coated on one or both sides of the core material. A fifth invention provides an excellent aluminum alloy laminated plate, (6) Mg0.4-1.5wt%, Si 0.3-2
, 3 wt%, Cu 012-1, 5 wt%, Be 0.
The core material is an aluminum alloy containing 2 wt% or less, the balance consisting of Al and impurities, Mn 0.3 to 4 wt%, Be 0.2t+rt% or less, and Fe 0.5 wt% or less, Mg 0.05 wt%. Below, C
u 0.5wt% or less, Ni 0.5wt% or less, Cr
005wt% or less, Zr 0.5wt% or less, ■0.
5% or less, Si0.54t% or less, Zn 005wt
% or less, and Ti 003wt% or less, B 0.06wt% or less 1
The skin material is an aluminum alloy containing one or two types of aluminum and the remainder is Al and impurities, and the thickness of the skin material is 2 to 20% of the total board thickness on one side, and is coated on one or both sides of the core material. This invention consists of six inventions, with the sixth invention being an aluminum alloy laminated plate having excellent formability, bake hardenability, and thread rust resistance with VF characteristics.

The aluminum alloy laminate plate according to the present invention, which has excellent formability, bake hardenability, and thread rust resistance, will be described in detail below.

(1) Regarding the core material.

Mg combines with Si to improve the strength of the material and the strength after baking, but on the other hand, it is an element that reduces formability and thread rust resistance, and if the content is less than 0.4 wt%, The strength is lower, and 1.5wt
If the content exceeds %, the strength after baking will increase, but the moldability will decrease.

Therefore, in order to improve the strength and moldability of the material, as well as the strength after baking, the Mg content should be set at 0.4~
1.5111t%.

$i combines with Mg to increase the strength of the material and the strength after baking, but it is an element that reduces the formability and thread rust resistance of the material, and if the content is less than 0.31%, the material cannot be formed. Workability is high, but strength and strength after baking are low, and if it is contained in an amount exceeding 2.3 wt%, the strength of the material and the strength after baking are high (although the moldability is reduced).

Therefore, the Si content should be 0.3 to 2.3 wt in order to increase the strength and moldability of the material, increase the strength after baking, and adjust it.
%.

Cu is effective in improving the strength of the material and the strength after baking in proportion to its content, but it also reduces the elongation of the material,
It is an element that reduces thread rust resistance, and the content is 0.2wt.
If the content exceeds 1.51%, the material will have good formability but its strength will be low, and the strength after baking will be small. , the moldability of the material decreases. Therefore, in order to improve the strength of the material, moldability, strength after baking, and adjust material properties, the Cu content is set to 0.2 to 1.5 wt%.

Ti has the effect of refining the crystal grains of the ingot, and the content is 0.3
If the content exceeds 111t%, the effect will be saturated. Therefore, the Ti content is set to 0.3 wt% or less.

B has the effect of refining the crystal grains of the ingot due to its synergistic effect with Ti, and the effect is saturated when the content exceeds 0.06 wL%. Therefore, the B content is 0.06wt
% or less.

Note that Ti and B are AlTi, Al-B and VAlTi
It is better to include it in an intermediate alloy such as B).

Mn, Fe, Ni, Cr%Zr, V are elements that improve rolling properties and material strength, Mn 0.8uit%,
Fe 0.5wt%, Ni 0.5wt%, Cr 0.
4wt%, Zr0.3wt%, (1) If the content exceeds 0.3111t%, the above effects are saturated and the moldability is greatly reduced. Therefore, in order to adjust the material properties,
Mn content NQ, 3wt% or less, Fe content 10.5wt
% or less, Ni content 0.5 wt% or less, Cr containing Ji
6.4wt% or less, Zr content 0.3wt% or less, V
0.03 wt% or less.

Be is an element that prevents oxidation of the core material because if the core material oxidizes during rolling of laminated sheets, the adhesion will deteriorate, and in some cases, it will not adhere. When this happens, the above effects become saturated. Therefore, Be
The content shall be 0.2 wt% or less.

(2) Regarding the leather material.

This skin material is required to have better thread rust resistance and better moldability than the core material.

As the Mn content increases, thread rust resistance and moldability decrease, but the extent of this decreases compared to Fe, Mg, Cu1Ni, and C
r% smaller than that containing Zr, V, Zn, and Si,
If the content exceeds 4 wt%, thread rust resistance, moldability, and rollability will decrease. Go up, M
The n content is 0.3 to 4 wt%.

Fe, Mg, CuSNi%Cr% Zr, V, Si, Z
When n is contained, it is an element that reduces thread rust resistance, formability, and rollability, and when these elements are less than 0.5 Iut%, the decline in thread rust resistance and formability is small, and it improves strength and crystallization. It has a grain refinement effect.

Therefore, the Fe content is 0.5 wt% or less, the Mg content is 0.5 wt% or less, the Cu content is 0.5 wt% or less, and the N
i content is 0.5 wt% or less, Cr content is 0.511
It% or less, Zr content is 0.5wt% or less, ■ content is 0.5wt% or less, Zn content is 0.5wt% or less,
S: The content is preferably regulated to 0.5 wt% or less.

Ti has the effect of refining the crystal grains of n lumps, and the effect is saturated when the content exceeds 0.3 ul%.

Therefore, the Ti content is set to 0.3 wt% or less.

B has the effect of refining the crystal grains of the ingot, and its coexistence with Ti increases this effect, and the content is 0.06 w.
If the content exceeds L%, the effect will be saturated. Therefore, the B content is set to 0.06+11t%.

Note that Ti and B are Al-Ti, Al-B, and Al-
It can be contained as an intermediate alloy of Ti-B.

Be is included for the same purpose as the core material, but the content is 0.2
...When contained in excess of t%, moldability is reduced.

Therefore, the Be content is set to 0.2+st% or less.

(3) Regarding the thickness of the skin material.

The thickness of the skin material is an important condition for improving thread rust resistance and moldability. Depending on the purpose, the skin material is provided on one or both sides of the core material. If the thickness is less than 2% on one side, there is a risk that the skin material will be damaged during manufacturing and thread rust will occur.If the thickness exceeds 20%, thread rust resistance and moldability are good, but The decrease in strength increases. Therefore, the thickness of the skin material is set to 2 to 20% of the total plate thickness for one side of the aluminum alloy laminated plate, taking into consideration thread rust resistance, moldability, and strength.

[Example 1] An example of an aluminum alloy laminate plate having excellent moldability, bake hardenability, and thread rust resistance according to the present invention will be described.

Example 1 Table 1 shows typical components and component ratios of the core material and skin material of the aluminum alloy laminated plate having excellent moldability, bake hardenability, and thread rust resistance according to the present invention.

The typical alloys shown in Table 1 are melted → cast → facing →
Heating or homogenization treatment → hot rolling (composite plate rolling or rolling of only the core material) → cold rolling → final heat treatment (tempering treatment), and the total plate thickness is 1.0 mm (the skin thickness is 5 mm on one side). The aluminum alloy laminated plate of the present invention with excellent formability, bake hardenability, and thread rust resistance (prepared on both sides), the laminated plate of the comparative example, and only the core material were used to make plates, and the tensile strength of the material was Table 2 shows the test results for strength, moldability (Erichsen value), bake hardenability, and thread rust resistance.

As is clear from Table 2, the aluminum alloy laminated plate of the present invention, which has excellent formability, bake hardenability, and thread rust resistance, has a higher It can be seen that it has excellent thread rust resistance and moldability, and maintains bake hardenability.

Example 2 Core material C-14 and core material C-140Be shown in Example 1
0.1 wt% and 0 Be in skin material S-2 and skin material S-2.
．． Using an ingot containing 0511IL% and 0.3wt%, homogenization treatment → facing → heating (up to hot rolling temperature) → hot rolling (including co-rolling) → cold rolling → tempering treatment Table 3 shows the Erichsen value and the adhesion condition during hot rolling of a 1.0 mm thick plate (the skin thickness was 5% on one side and both sides were coated).

90: Sometimes it doesn't adhere. (No problem in mass production) From this Table 3, we can see that (1) the adhesion rate during hot rolling improves when Be is included in the core material and the skin material, and (2) the Be content in the skin material is 0. It can be seen that the Erichsen value decreases when it reaches 3+lIt%.

Therefore, when the heating atmosphere is highly oxidizing, 0.2 wt% Be is added to either or both of the core material and the skin material.
By containing the following, the yield can be improved.

Example 3 Core material C-4 as shown in Example 1 C-14 and skin material S-
Regarding 2, melting → casting → homogenization → facing → heating (up to hot rolling temperature) → hot rolling (combined rolling) → cold rolling →
Thermal treatment → left at room temperature for 1 day → reheat treatment (70℃ x 24 hours), total board thickness 1, On+m one side thickness of skin material 0
Table 4-2 shows the relationship between the thickness of the skin material, tensile strength, moldability, bake hardenability, and thread rust resistance.

From Table 4, (1) When the thickness of the skin material is 1.5% of the total board thickness on one side, there is no decrease in strength, moldability, and hardening property, but the improvement in thread rust resistance is small.

(2) When the thickness of the skin material is 25% of the total board thickness on one side,
Although the moldability and thread rust resistance are improved, the strength and proof stress after baking are about 70% lower than when only the core material is used.

(3) Therefore, in the aluminum alloy gold plate of the present invention, which has excellent formability, bake hardenability, and thread rust resistance, the skin material is made to account for 2 to 20% of the total plate thickness on one side, thereby increasing the strength. , excellent moldability, bake hardenability, and thread rust resistance.

That is clear.

In the above examples, test piece preparation conditions, thread rust resistance test conditions, and evaluation of thread rust resistance will be explained below.

(1) Test piece preparation conditions Al plate → degreasing → water washing → zinc phosphate treatment → water washing → pure water washing → drying → cationic N (coating film = 20 μm, 155° (:X2
0 minute heating) → Intermediate coating (coating film = 30 II +n, 14 (
Heating for 1'CX2S) → Top coat (coating film = 35 μm, 150
℃ x 25 minutes heating) → Thread rust resistance test (2) Thread rust resistance test conditions Put 7 pieces on the coating → Salt water spray: 1 (JIs, 24 hour exposure) → Humidity (Temperature = 45°C 1 Humidity = 95%, 20 days exposure) → Evaluation of thread rust resistance (3) Evaluation of thread rust resistance Length Evaluation: 1.0 mm or less ◎ 1.0-2.0 ■ 0 2.1-4.0 Dragon Δ 4. 1 mm or greater It has excellent thread rust resistance, moldability, bake hardenability, and strength, and is increasingly used in land transportation vehicles, electrical equipment, etc.
The industrial effects are significant.

Procedural Amendment (Spontaneous) January 4, 1986 Director General of the Patent Office Mr. Ka Michibu 51.31
Display of notes 1985 Patent M No. 2641.10 2, Name of the invention Aluminum alloy laminated plate with excellent formability, bake hardenability, and string rust resistance 36 Relationship to the case of the amended person Address of the patent applicant No. 3-18 N-chome, Wakihama-cho, Chuo-ku, Kobe Name (1)
19) Kobe Steel Co., Ltd. Representative Fuyuhiko Maki 4, Agent 1 No. 6 Fujiwazuka Yocho Co-op, 2-2-15 Minamisuna, Koto-ku, Tokyo Detailed explanation of the invention in the specification subject to amendment Column 7, contents of amendment As shown in the attached sheet, (1) "Moldability" on page 8, line 7 of the specification is amended to "Moldability (stretchability, 180° bendability)."

(2) “The present invention...
・Resistance to thread rust" is corrected to "The present invention is effective against stretch workability, 180° bending workability, and thread rust in the aluminum alloy described above."

(3) When [ on page 17, lines 7 to 9 of the specification is oxidized...
・・Prevent] is corrected to ``Improve the adhesion of leather and skin materials.''

(4) On page 21 of the specification, lines 5 and 6, “Only the core material is a board...”
...(Erichsen value),"
Yield strength and formability (Erichsen value and 1
80° bendability).

(5) “and” on page 26, line 3 of the specification is replaced with “,C-16
and” amended.

(6) On page 27, lines 3 and 4 of the specification, change "It can be seen that the Erichsen value has decreased." to [Erichsen value and 1
It can be seen that the 80° bendability is decreased, and (3) when the Si content is 2.5+nt%, the product becomes uneven during hot rolling and cannot be produced. ” he corrected.

(7) "Moldability" on page 27, line 20 of the specification is deleted.

(8) "String rust resistance" on page 28, line 1 of the specification fjS is corrected to "molding processability and thread rust resistance."

(9) Table 151 (1) on page 22 of the specification, Table 2 (1) on page 24, Table 2 (2) on page 25, Table 3 on page 26 of the specification
The table, Table 4 on page 29 of the same table is amended as shown in the attached sheet.

◎: 100% adhesion ○: Sometimes it does not adhere. (No problem in mass production)

Claims (6)

[Claims] (1) Mg0.4-1.5wt%, Si0.3-2.3
The core material is an aluminum alloy containing 0.2 to 1.5 wt% of Cu, and the balance is Al and impurities, and the skin is an aluminum alloy containing 0.3 to 4 wt% of Mn, and the balance is Al and impurities. , and the thickness of the skin material is 2 to 20% of the total board thickness on one side, and the core material is coated on one or both sides.It has excellent moldability, bake hardenability, and thread rust resistance. Aluminum alloy laminate. (2) Mg0.4-1.5wt%, Si0.3-2.3
wt%, Cu0.2-1.5wt%, and further contains Mn0.8wt% or less, Fe0.5wt% or less, Ni0
．． 5wt% or less, Cr0.4wt% or less, Ti0.3w
An aluminum alloy containing one or more selected from t% or less, Zr 0.3wt% or less, Be 0.2wt% or less, V 0.3wt% or less, B 0.06wt% or less, and the balance is Al and impurities. The core material is an aluminum alloy containing 0.3 to 4 wt% of Mn, and the balance is Al and impurities, and the thickness of the skin material is 2 to 20% of the total plate thickness on one side. An aluminum alloy laminate plate with excellent formability, bake hardenability and string rust resistance, characterized by being coated on one or both sides of the plate. (3) Mg0.4-1.5wt%, Si0.3-2.3
The core material is an aluminum alloy containing 0.2 to 1.5 wt% of Cu, the balance being Al and impurities, and 0.3 to 4 wt% of Mn, and furthermore, 0.5 wt% or less of Fe and 0.5 wt% of Mg. Below, Cu0
．． 5wt% or less, Ni0.5wt% or less, Cr0.5w
t% or less, Zr0.5wt% or less, V0.5wt% or less, Si0.5wt% or less, Zn0.5wt% or less, and Ti0.3wt% or less, B0 The skin material is an aluminum alloy containing 0.06 wt% or less of one or two types, the balance being Al and impurities, and the thickness of the skin material is 2 to 20% of the total plate thickness on one side, and the core material is An aluminum alloy laminate with excellent formability, bake hardenability, and thread rust resistance, characterized by being coated on one or both sides. (4) Mg0.4-1.5wt%, Si0.3-2.3
wt%, Cu0.2-1.5wt%, and further contains Mn0.8wt% or less, Fe0.5wt% or less, Ni0
．． 5wt% or less, Cr0.4wt% or less, Ti0.3w
t% or less, Zr0.3wt% or less, Be0.2wt% or less, V0.3wt% or less, B0.06wt% or less, and the balance is Al and impurities. The core material contains 0.3 to 4 wt% of Mn, and further contains 0.5 wt% or less of Fe, 0.5 wt% or less of Mg, and Cu0
．． 5wt% or less, Ni0.5wt% or less, Cr0.5w
t% or less, Zr 0.5wt% or less, V 0.5wt% or less, Si 0.5wt% or less, Zn 0.5wt% or less, and Ti 0.3wt% or less, The skin material is an aluminum alloy containing one or two types of B0.06wt% or less, the balance being Al and impurities, and the thickness of the skin material is 2 to 20% of the total board thickness on one side, and the core material An aluminum alloy laminate plate with excellent formability, bake hardenability and string rust resistance, characterized by being coated on one or both sides of the plate. (5) Mg0.4-1.5wt%, Si0.3-2.3
wt%, Cu0.2-2.3wt%, Be0.2wt%
The core material is an aluminum alloy containing the following, with the balance consisting of Al and impurities, and the skin material is an aluminum alloy containing 0.3 to 4 wt% Mn and 0.2 wt% or less Be, and the balance consisting of Al and impurities. The thickness of the material is 2~2 of the total board thickness on one side.
An aluminum alloy laminate with excellent moldability, bake hardenability, and thread rust resistance, characterized by coating one or both sides of a core material. (6) Mg0.4-1.5wt%, Si0.3-2.3
wt%, Cu0.2-1.5wt%, Be0.2wt%
The core material is an aluminum alloy containing the following, with the remainder being Al and impurities, containing 0.3 to 4 wt% of Mn, 0.2 wt% or less of Be, and 0.5 wt% or less of Fe, 0.5 wt% or less of Mg, and Cu0.
．． 5wt% or less, Ni0.5wt% or less, Cr0.5w
Contains one or more selected from t% or less, Zr0.5wt% or less, V0.5wt% or less, Si0.5wt% or less, Zn0.5wt% or less, and Ti0.3wt% or less, The skin material is an aluminum alloy containing one or two types of B0.06wt% or less, the balance being Al and impurities, and the thickness of the skin material is 2 to 20% of the total board thickness on one side, and the core material An aluminum alloy laminate plate with excellent formability, bake hardenability, and thread rust resistance, characterized by having a coating on one or both sides of the aluminum alloy.