JPH07157864A - Al based plated metallic material for press forming - Google Patents

Abstract

PURPOSE:To impart excellent press formability to an Al based metallic material by forming an Al-Cr alloy vacuum-deposited layer having a specified compsn. and coating weight thereon. CONSTITUTION:An Al-Cr based alloy vacuum deposition plated layer is formed on a metallic material applied with Al based plating by vacuum deposition. At that time, the coating weight is regulated to 0.5 to 10g/m<2> and the center line surface roughness Ra on the surface of the vacuum deposition plated layer is regulated to >=0.7mum, by which a vacuum deposition plated layer is prevented at the time of press forming to reduce its coefficient of friction, and at the same time, its oil storing performance with a die is increased to improve its formability. Moreover, a chemically treated film essentially consisting of the hydrated oxide of Al is preferably formed on the surface of the vacuum deposition plated layer, by which its lubricity is improved, and at the same time, at the time of press forming, the direct contact between the vacuum deposition plated layer and a die is prevented, and the prevention of the pick up and seizing of the plated layer on a die can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Al-based plated metal material for press forming that exhibits excellent press workability, and this plated metal material is used in various fields such as automobiles, household electric appliances, and building materials. Useful for. The metallic materials to which the present invention is applied include ordinary steel, stainless steel, various alloy steels, non-ferrous materials such as Al, Cu, Ti, and alloys thereof, and their shapes are plate-like, rod-like, and tubular. Although various shapes such as etc. are targeted, as the most representative ones below,
The description will be made mainly for the case of using a steel plate.

[0002]

2. Description of the Related Art Hot-dip Al plated steel sheets are excellent in heat resistance, corrosion resistance, weather resistance and the like, and their production costs are relatively low. Therefore, they have been conventionally used in automobile mufflers, household appliances, building materials, It has been widely used as an incinerator member. However, in the hot-dip plating method, the base steel sheet is immersed in a high-temperature molten Al bath at about 700 ° C. for plating, so that an Fe—Al-based intermetallic compound is formed at the interface between the steel sheet and the Al-plated layer. Since this intermetallic compound is hard and brittle, it cannot follow the deformation of the base steel sheet during press forming,
There are problems that cracks are generated in the plating layer and that the plating layer is easily peeled off.

A technique for producing an Al-plated steel sheet by the electroplating method has also been studied, and a method for electrodeposition from a non-aqueous organic solvent solution in which various Al-based salts are dissolved or an Al-based molten salt bath is examined. Has been done. In the electroplating method, the degree of freedom with respect to the type and content of the metal salt that can be added to the bath is much higher than in the hot dipping method, and not only pure Al plating but also various Al-based alloy plating (for example, Al-Mn). It has the advantage of being able to electrodeposit alloy plating). However, in the electroplating method, the current efficiency is low, the electrodeposition at a high current density is impossible, and the plating solution is electrically unstable. The reality is that it is difficult to put it into practical use.

On the other hand, the vacuum evaporation plating method, in which the evaporation raw material is heated and evaporated in a vacuum or a dilute gas atmosphere to form an evaporation plating layer on the surface of the material to be plated, is more difficult to manufacture than the above hot dipping method or electroplating method. Since the degree of freedom of Al
It is widely used as a method for forming a system plating layer. As a facility for manufacturing an Al-based plated steel sheet by such a vacuum deposition plating method, from the atmosphere to the vacuum or from the vacuum to the atmosphere,
By installing a vacuum lock system that continuously introduces a steel strip as a material to be plated (see 5 and 10 in FIG. 1 below), it becomes possible to install the inlet / outlet side equipment in the atmosphere,
Therefore, equipment capable of continuously vapor-depositing a plurality of steel strips has been realized. In the vacuum evaporation plating method, electric resistance heating or high frequency induction heating can be adopted as a means for heating and evaporating the evaporation raw material. However, by adopting a high-density energy source such as an electron beam or a laser beam, various refractory metals can be used. In addition to the materials, it has the advantage that it can be applied to non-metallic materials such as ceramics. Further, the vacuum vapor deposition plating method is also characterized by high productivity, no problem of waste liquid treatment, and easy post-treatment. For these reasons, the scope of application of the vacuum evaporation plating method is rapidly expanding.

Under these circumstances, various techniques for producing an Al-based plated steel sheet by the vacuum vapor deposition method have been studied, and Al-Cr based alloy vapor-deposited steel sheet (Japanese Unexamined Patent Publication No. 1-188666) and Al-Ti have been studied so far. Various Al-based plated steel sheets having excellent corrosion resistance such as a system alloy vapor-deposited plated steel sheet (JP-A-1-184268) have been proposed.

[0006]

The Al-plated steel sheet is
It is generally used after being subjected to press molding, and it is necessary to have good press workability as well as heat resistance and corrosion resistance. However, most of the Al-plated steel sheets that have been proposed so far have been developed with the aim of further improving corrosion resistance, and the press workability has not been sufficiently investigated.

In order to achieve good press workability,
During press forming, the plating layer follows the deformation of the base steel sheet, and there is no crack in the plating layer or peeling of the plating layer,
In addition, it is required that the friction coefficient between the die and the surface of the plated steel sheet be small during press forming and that it have good slidability. For this purpose, it is necessary that the plating layer has good plastic deformability, and at the same time, the hardness of the plating layer is high so that galling by the mold does not occur. However, an Al-based plated steel sheet having a conventional α (Al) phase single phase or α (Al) phase-based plating layer, or the surface of the plating layer is α (A
l) In an Al-based plated steel sheet that is mainly composed of phases, cracks and peeling of the plated layer are not observed in the plated layer unless a brittle intermetallic compound is generated at the interface between the steel sheet and the plated layer. ) Since the phase has a low hardness, there is a problem that the friction coefficient with the mold becomes large during press molding, and as a result, galling occurs due to the mold and press workability becomes poor.

The present invention has been made under these circumstances, and an object thereof is for press molding which exhibits excellent press workability while utilizing the heat resistance and corrosion resistance characteristics of an Al-based plated metal material. It is intended to provide an Al-based plated metal material.

[0009]

Means for Solving the Problems According to the present invention which has achieved the above object, an Al-Cr alloy vapor deposition plated layer having a Cr content of 15 to 30% by weight is provided on a metal material plated with Al. The amount of adhesion is 0.5 to 10 g / m ² , and the press molding is characterized in that the center line average roughness Ra of the surface of the Al—Cr alloy vapor deposition plated layer is 0.7 μm or more. It is an Al-based plated metal material.

Further, according to the present invention, the deposited amount of the Al—Cr alloy vapor deposition plated layer having a Cr content of 15 to 30% by weight is:
0.5-10 g / m ² and the Al-C
The gist is also that a chemical conversion treatment film containing a hydrated oxide of Al as a main component is formed on the surface of the r-based alloy vapor deposition plated layer.

Further, from the viewpoint of improving the press workability of the Al-based plated metal material, Al is not limited to the surface of the Al-Cr-based alloy vapor-deposited plated layer but may be applied to the surface of various Al-based plated metal materials. It is also effective to form a chemical conversion treatment film containing a hydrated oxide as a main component.

[0012]

[Function] Hensen's Al-Cr binary system phase diagram (CONSTITUTI
According to ON OF BINARY ALLOYS, McGROW, 1958), α (A
l) The solid solubility limit of Cr in the phase is 0.19% by weight at 500 ° C.,
It is set to 0.015% by weight at 300 ° C. The solid solubility limit at room temperature is not specified, but should be smaller. Further, when the Cr concentration is around 22% by weight, a θ (Al ₁₃ Cr ₂ ) phase which is an intermetallic compound of Al and Cr is precipitated, and in the composition range during this, an α (Al) phase (Al in which Cr is a solid solution is formed) is formed.
Phase) and the θ phase (Al ₁₃ Cr ₂ ) coexist. In the composition region where the Cr concentration is higher, η (Cr ₂ Al
₁₁ ) Various intermetallic compounds such as phase and ε (CrAl ₄ ) phase are precipitated. Therefore, the hardness of the α-phase single phase of Al is very low at 50 to 60 at H _V , but the hardness of the Al-Cr alloy is remarkably increased by increasing the Cr concentration to precipitate the intermetallic compound. It is supposed to do.

Therefore, the present inventors put the Al--Cr alloy in a single evaporation tank, and simultaneously evaporate Al and Cr from the single evaporation tank to perform Al--Cr alloy vapor deposition plating.
The surface of the 1-based plated metal material was further subjected to Al—Cr alloy vapor deposition plating, and various studies were made. As a result, the upper layer of Al
-By defining the Cr content in the Cr-based alloy vapor-deposited plating layer, the coating adhesion amount, the center line average roughness Ra of the plating layer surface, etc. to appropriate values, the characteristics of the Al-based plated metal material as the lower layer can be used effectively. At the same time, they found that they exhibited excellent press workability, and completed the present invention.

The reasons for limiting the composition and deposition amount of the Al—Cr alloy vapor deposition plated layer in the present invention are as follows. First, the Cr content in the Al—Cr alloy vapor deposition plating layer needs to be 15 to 30 wt%. The crystal structure of the Al-Cr alloy vapor-deposited plating layer does not follow the equilibrium phase diagram as described above, and up to a Cr concentration of 5% by weight, an α (Al) phase single phase crystal in which Cr is supersaturated as a solid solution is formed. Structure,
When the Cr concentration becomes higher than this, the θ phase is precipitated and the hardness of the plating layer increases. However, if the Cr content is less than 15% by weight, the hardness of the Al—Cr alloy vapor-deposited plating layer does not sufficiently increase, so that the friction coefficient becomes large and good slidability cannot be obtained. On the other hand, when the Cr content exceeds 30% by weight, the plating layer has a crystal structure consisting of only intermetallic compounds and the above effects are saturated. Also Cr
In order to obtain Al-Cr alloy vapor deposition plating with a high content, it is necessary to increase the Cr content in the Al-Cr alloy bath in the evaporation tank. In this case, Al-C is added together with Cr.
Since the melting point of the r-alloy bath rises and it becomes difficult to form a uniform bath in the evaporation tank, even from this viewpoint, Cr
The content should be 30% by weight or less. Al-C
Si, T as the third element in the r-based alloy vapor deposition plating layer
It is also possible to add i, Ni, Zr, Mg, Fe, Mn or the like, and by adding these elements, the hardness of the plating layer can be further improved.

The amount of deposition of the Al-Cr alloy vapor deposition plating layer as described above must be in the range of 0.5 to 10 g / m ² . If the coating weight is less than 0.5 g / m ² , the effect of reducing the friction coefficient is not exhibited because the plating layer is thin, and if it exceeds 10 g / m ² , Al-C during press molding is used.
The r-based alloy vapor deposition plating layer itself peels off.

In the present invention, in addition to the above requirements, the center line average roughness Ra of the surface of the Al—Cr alloy vapor deposition plated layer must be 0.7 μm or more. That is, when press-molding an Al-based plated metal material, rust preventive oil or processing oil is generally applied, but the center line average roughness Ra is 0.7 μm.
At less than 1, the oil storage capacity between the Al-based plated metal material and the mold becomes small, and even if the hardness of the plating layer surface is sufficiently high, the oil between the Al-based plated metal material and the mold is low. Will be exhausted and it will not be possible to secure a low coefficient of friction.

Regarding the type of the Al-based plating layer below the Al-Cr-based alloy vapor-deposited plating layer, various Al-based alloy vapor depositions other than molten Al plating and vapor-deposited pure Al can be used depending on the required characteristics of the metal material. Plating can be adopted and is not particularly limited as long as it is Al-based plating. For example, if an Al-Cr alloy vapor deposition plating containing an appropriate amount of Cr as an alloy element is adopted as the lower layer, better corrosion resistance can be expected, and if Al-Si alloy vapor deposition plating containing Si is used for the lower layer plating. Has a better heat resistance. In addition, as the plating structure of the Al-based plated metal material of the present invention, the lower Al-based plating layer and the upper Al-based plating layer are used.
-It is not essential to have a two-layer structure of a Cr-based alloy vapor deposition plating layer, but a lower Al-based plating layer and an upper Al-
It also includes a configuration in which a diffusion layer as an intermediate layer is formed during the Cr alloy vapor deposition plating, and such a configuration improves the adhesion between the lower plating layer and the upper plating layer. It works effectively.

The amount of the Al-based plating as the lower layer is not particularly limited, and the amount can be changed according to the required characteristics of the metal material. For example, in order to sufficiently exert its function as an Al-based plated metal material having excellent corrosiveness, the plating adhesion amount is 5
g / m ² or more, more preferably 10 g / m ² or more.

In producing the Al-plated metal material for press forming according to the present invention, the surface of the Al-plated metal material as the lower layer is cleaned by degreasing, pickling, etc., if necessary, A method of vapor deposition plating by a batch method can also be adopted, but it is considered from the viewpoint of mass production to form Al-Cr alloy vapor deposition plating on an Al-plated metal material with a continuous vapor deposition equipment as shown in FIG. It is advantageous. In Figure 1,
1 is a feeding roll, 2, 14 is a shear, 3 is a welding machine, 4
Is a pretreatment chamber, 5 is an inlet side vacuum lock system, 6 is an electron gun, 7a and 7b are vapor deposition chambers, 8 is an evaporation tank, 9 is an electron beam, 10 is an outlet side lock system, 11 is a nitrogen cooling device,
12 is a post-processing device, 13 is a skin pass rolling machine, 15 is a winding roll, and 16 is a zone to be treated. The deposition chamber 7
As shown in the figure, one evaporation tank 8 is usually installed in each of a and 7b. However, when the lower Al-based plating layer is also formed by vapor deposition plating, for example, as shown in FIG. If continuous vapor deposition equipment having a plurality of vapor deposition tanks 8a and 8b in the vapor deposition chambers 7a and 7b, respectively, is used, the Al of the present invention can be formed by one pass.
It is advantageous because a system-plated steel sheet can be manufactured. Further, in the equipment configuration shown in FIG. 1, since the post-treatment device 12 is mainly for forming a chemical conversion treatment film, the post-treatment device 12 may not be provided when the chemical conversion treatment film is not formed. .

By the way, in the Al-based plated steel sheet of the present invention, from the viewpoint of further improving the press workability, a hydrated oxide of Al is contained as a main component on the surface of the Al-Cr alloy vapor deposition plated layer. As described above, it is effective to further form a chemical conversion coating, but such a chemical conversion coating prevents direct contact between the mold and the plating layer during press molding, and prevents the plating layer from forming a mold. Prevents pickup and burn-in. Further, when rust-preventing oil is applied to the surface, the rust-preventing oil permeates into this film, and the effect of improving lubricity is also exhibited. Due to these effects, the limit of deep drawing at the time of press forming becomes large, and good press workability is achieved. Further, the chemical conversion treatment film exhibits the effect of improving the white rust resistance of the plating layer itself. When forming the chemical conversion coating, the center line surface roughness Ra of the surface of the Al—Cr alloy vapor deposition plated layer is not necessarily 0.7 μm, because the effect of improving the lubricity is exhibited by itself.
There is no need to go above.

In forming the chemical conversion coating as described above on the surface of the Al-Cr alloy vapor deposition plated layer, Al-C is used.
The surface of the r-based alloy vapor deposition plated layer may be brought to an appropriate temperature to bring the surface of the plated layer into contact with water. At this time, the surface temperature of the Al—Cr alloy vapor deposition plated layer is preferably in the temperature state of 200 to 70 ° C. That is, when the surface temperature of the Al—Cr alloy vapor deposition plated layer exceeds 200 ° C., the reaction due to contact between water and the plated layer proceeds too rapidly, so that the thickness of the chemical conversion treatment film to be formed becomes too thick, The chemical conversion treatment film comes to be peeled off at the time of molding, and below 70 ° C., the chemical conversion treatment film is hardly formed. Further, the means for bringing the surface temperature of the Al—Cr alloy vapor deposition plated layer into the above temperature state is not particularly limited, but in view of productivity, the surface temperature raised by the vacuum vapor deposition treatment is positively increased. You can use it. To this end, A deposited in vacuum
Since it is necessary to introduce the l-plated metal material into the atmosphere until the temperature of the l-plated metal material is lowered and to bring it into contact with water, a lock system for continuously introducing the Al-plated metal material from the vacuum into the atmosphere (Fig. 1). The outgoing lock system 10) shown in FIG.

As described above, by contacting and reacting the high temperature Al-based plating layer with water, a chemical conversion coating film mainly composed of Al hydrated oxide is formed on the surface of the plating layer. The chemical conversion treatment film improves the press workability as described above. This treatment film, when the Al-based plated metal material is exposed to a corrosive environment, has the Al-based plating layer itself as described above. It also functions as a protective film that suppresses corrosion (especially white rust).

The form of water in forming the chemical conversion coating as described above may be gas or liquid, but the surface temperature of the plating layer at the time of contact is required to be about 200 to 70 ° C. Spraying with steam, immersion in hot water, spraying with hot water, or a combination thereof is preferable. Further, if the water to be contacted contains a soluble phosphoric acid compound, the chemical conversion treatment film to be formed will contain an Al phosphate compound, and the chemical conversion treatment film will become stronger and the friction coefficient during press molding will be increased. Not only decreases and press workability improves, but
Corrosion resistance is further improved. As the soluble phosphoric acid compound added at this time, condensed phosphoric acid such as orthophosphoric acid, metaphosphoric acid and pyrophosphoric acid, various phosphoric acid compounds such as phosphorous acid and hypophosphorous acid, and their sodium salts, potassium salts, ammonium salts and the like can be used. . Of these, sodium dihydrogen phosphate is preferable in consideration of the pH and solubility of the solution. Further, the concentration of the soluble phosphoric acid compound is preferably about 0.1 to 50 g / liter. That is, if the concentration of the soluble phosphoric acid compound is less than 0.1 g / liter, the addition effect is not exhibited, and if it exceeds 50 g / liter, not only the effect of the addition of the phosphate compound is saturated, but also the water content in the treatment tank or the spray device is increased. Phosphate crystals generated by evaporation increase and various inconveniences occur.

When forming the chemical conversion coating as described above, the effect of improving the press formability is achieved by the coating itself. Therefore, the Al-based plating layer on which the coating is formed is the Al-Cr-based coating layer. Pure A as well as alloy deposition plating layer
l plating layer, Al-Ti alloy plating layer and Al-Ni
It is also applicable to various Al-based alloy plating layers such as alloy plating layers, and further to multi-layer plating such as upper layer Al / lower layer Cr, upper layer Al / lower layer Ti, and upper layer Al / lower layer Si. In short, when forming the above-mentioned chemical conversion treatment film, Al-Cr is used as the upper layer.
Even if the vapor-deposited alloy plating layer is not formed, the press workability improving effect in the present invention can be achieved.

The present invention will be described in more detail with reference to the following examples, but the following examples are not intended to limit the present invention, and any modification of the design of the present invention can be made without departing from the spirit of the preceding and the following. It is included in the technical scope.

[0026]

【Example】

Example 1 By the continuous vapor deposition equipment shown in FIG. 1 (however, the post-treatment device 12 is not provided), Al-Cr alloy vapor deposition plating is performed on various Al-based plated steel sheets to produce various Al-based plated steel sheets. did. At this time, the deposition amount of the vapor deposition plating was adjusted by the output of the electron gun and the line speed. Further, the Cr content was adjusted by the Cr content of the molten Al-Cr alloy in the vapor deposition tank. Furthermore, if necessary, two-layer vapor deposition plating was also performed by the two vapor deposition tanks 8a and 8b shown in FIG. In this case, the vapor deposition tank 8b on the rear side in the traveling direction of the steel plate (steel strip)
By inserting an Al-Cr alloy into the
An l-Cr alloy plating layer can be formed. The vapor deposition plating conditions are shown below. Tables 1 and 2 show the configurations of the various Al-plated steel sheets obtained.

(Evaporation plating conditions) Line speed: 10 to 15 m / min Temperature of material to be plated: 250 to 300 ° C. (before plating) Evaporation raw material: Al-Cr alloy Evaporation tank: High-purity fused alumina evaporation tank Heated evaporation Source: Pierce type electron gun (maximum output 300
W) Evaporation chamber vacuum degree: 2 × 10 ^-2 Pa or less

[0028]

[Table 1]

[0029]

[Table 2]

Regarding the various Al-based plated steel sheets obtained,
The friction coefficient and plating adhesion were evaluated by the following methods and standards. The results are collectively shown in Table 3. (Friction Coefficient) Rust-preventing oil was applied to the surface of each Al-plated steel sheet, and the sliding resistance at the time of pulling out by pressing with a jig was measured and obtained. ◯: Small friction coefficient (friction coefficient μ ≦ 0.11) Δ: Medium friction coefficient (0.11 <friction coefficient μ <0.13) ×: Small friction coefficient (friction coefficient μ ≧ 0.13) (plating adhesion ) After performing a ball impact test on each Al-plated steel sheet, the plating layer of the processed portion is taped and peeled off,
The amount of the plating powder adhered to and peeled from the tape was visually evaluated. ◯: No peeling of the plating layer △: Slight peeling of the plating layer ×: Significant peeling of the plating layer

[0031]

[Table 3]

As is clear from Tables 1 to 3, the examples satisfying the specified requirements of the present invention have a small friction coefficient and excellent press formability can be secured, while any of the specified requirements of the present invention. It can be seen that the press moldability is inferior in the comparative example lacking such a point.

Example 2 Using a 0.8 mm cold rolled steel sheet, pure Al plating and Al-5% Cr alloy vapor deposition plating were carried out in the continuous vapor deposition equipment shown in FIG. At this time, the deposition amount of the vapor deposition plating was adjusted by the power and line speed of the input electron beam. Further, the Cr content was adjusted by setting the Cr content of the molten Al-Cr alloy in the vapor deposition tank to 35%. In addition, Al-based plating in which upper layer Al / lower layer Si multi-layer plating was performed by double-layer vapor deposition plating using two vapor deposition tanks shown in FIG. 2 was also performed.

The vapor-deposited steel sheet is passed through a facility for continuously introducing a steel strip from a vacuum to the atmosphere (the above-mentioned output side vacuum lock system 10), and then contacted with water in a post-treatment device 12, A chemical conversion coating was formed on the surface of the plating layer. The contact method at this time is 120 ° C.
Of water vapor and hot water of 90 ° C. were sprayed. Further, sodium dihydrogen phosphate was added to the hot water as needed. The temperature of the steel sheet was adjusted by the rotation speed of a fan (not shown) of the nitrogen cooling device 11, and the temperature was measured at the entrance side of the post-treatment device 12 by an infrared radiation thermometer. Table 4 shows the treatment conditions and the plating layer structure.

[0035]

[Table 4]

The obtained Al-based plated steel sheets were evaluated for lubricity and corrosion resistance by the methods and criteria shown below. The results are shown in Table 5. (Lubricity) Each plated steel sheet was subjected to a cylindrical deep drawing test under the following conditions, and its limit drawing ratio (LDR) was used to evaluate the lubricity. Punch diameter: 50 mmφ Punch shoulder radius: 0.8 mm Wrinkle suppression force: 600 kgf Rust-preventing oil: Noxlite 550 (manufactured by Nippon Parkerizing Co., Ltd.) applied at 2 g / m ² (corrosion resistance) Each plated steel plate was cut into 70 mm × 150 mm, and the end surface was cut. Then, after sealing the back surface, a salt spray test was performed, and evaluation was performed by the time until white rust or discoloration occurred on the surface.

[0037]

[Table 5]

As is clear from Tables 4 and 5, it can be seen that the one in which the chemical conversion treatment film is formed under appropriate conditions has good lubricity and corrosion resistance. On the other hand, it is understood that the above effects are not obtained in the case where the conditions are not appropriate and the case where the chemical conversion coating is not formed.

[0039]

The present invention is constituted as described above, and an Al-based plated metal material for press molding having excellent press workability was obtained. In addition, the technique of the present invention that exerts such an effect leads to the expansion of applications of the Al-plated steel sheet, and therefore has great industrial significance.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing one structural example of a continuous vapor deposition facility for producing an Al-based plated metal material of the present invention.

FIG. 2 is a schematic explanatory view showing another configuration example of the continuous vapor deposition equipment for producing the Al-based plated metal material of the present invention.

[Explanation of Codes] 1 Feeding roll 2,14 Shear 3 Welder 4 Pretreatment chamber 5 Entry side lock system 6 Electron gun 7a, 7b Vapor deposition chamber 8, 8a, 8b Evaporation tank 10 Exit side lock system 11 Nitrogen cooling device 12 After Processing device 13 Skin pass rolling machine 15 Winding roll 16 Processing zone

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tota Ayabe 1 Kanazawa Town, Kakogawa City, Hyogo Prefecture Kadogawa Steel Works Kakogawa Works

Claims (3)

[Claims] 1. A metallic material plated with an Al-based material is provided with Cr.
The Al-Cr alloy vapor-deposited plating layer having a content of 15 to 30 wt% is formed with an adhesion amount of 0.5 to 10 g / m ² , and the center of the surface of the Al-Cr alloy vapor-deposited plating layer. An Al-based plated metal material for press molding, which has a line average roughness Ra of 0.7 μm or more. 2. A metal material plated with Al-based material containing Cr
An Al-Cr alloy vapor-deposited plating layer having a content of 15 to 30% by weight is formed with an adhesion amount of 0.5 to 10 g / m ² , and on the surface of the Al-Cr alloy vapor-deposited plating layer,
An Al-based plated metal material for press forming, characterized in that a chemical conversion treatment film containing a hydrated oxide of Al as a main component is formed. 3. An Al-based plated metal material for press forming, characterized in that a chemical conversion coating film containing a hydrated oxide of Al as a main component is formed on the surface of the Al-based plated metal material.