JP2001167746A - Method of fabricating sheet metal and sheet metal fabricated thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase productivity in surface treatment of a battery can-forming material. SOLUTION: A porous metal is made to contract the surface of a slab, and the slab and the porous metal are then fused to each other. A powder metal consisting of a metal different from the slab is spread or coated to the porous metal, and filled in pores of the porous metal. Next, the resulting structure is pressed until the powder metal filled in the pores can not fall out. Then, the powder metal is fused to the porous metal and the slab, so that a metal layer consisting of the powder metal and the porous metal is formed integrally with the slab. Then, the resulting structure is subjected to hot rolling and cold rolling.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal plate and a metal plate manufactured by the method, wherein the metal plate is used for a large battery container such as a battery can or a fuel cell, a container for accommodating a battery can, and other than a battery. It is suitably used as a material for forming various containers.

[0002]

2. Description of the Related Art Conventionally, as a material for forming a battery can, a cast slab is first hot-rolled, then cold-rolled and rolled to a target thickness, and the cold-rolled steel sheet is plated with nickel or the like. Has been plated. Alternatively, a cold-rolled steel sheet is rolled to a final thickness of 1 to 3% before the final thickness, and then plated, and then subjected to annealing and a skin pass rolling rate of 1 to 3%.
% To obtain the desired thickness. The annealing performed after the plating is performed to form a diffusion layer of metal and iron in the surface layer.

In the above-mentioned conventional manufacturing method, since a thin plate (for example, a plate thickness of 0.2 mm to 0.60 mm) after cold rolling is plated, the electric resistance is high because the plate is thin. And the current during plating (current density A / d
It is very difficult to increase m ² ). Therefore, in order to increase productivity, it is necessary to increase the length of the electrolytic cell from several tens of meters to several hundreds of meters, in which case the chemicals required for the plating process and the electrical equipment become large, and the amount of electricity used is increased. Etc. have a huge problem. In addition, when the sheet thickness is small, the length per weight becomes very long, and the productivity is deteriorated.

[0004] In order to solve the above-mentioned problem, the present applicant previously disclosed in Japanese Patent Application Laid-Open No. Hei 10-92395, a lamination material made of a metal plate was laminated on at least one side of a slab, and hot rolling was performed while performing width tightening. Cold rolling is performed to provide a battery can forming material made of clad steel. Thus, in the case of clad steel, the metal layer formed by plating is formed by attaching a bonding material at the slab stage,
Basically, the plating process is not required, and the poor productivity due to the plating process can be eliminated.

[0005]

However, in the case of clad steel, when the cladding material is laminated on the base material (slab), it is difficult to deaerate, and oxygen in the air is generated between the base material and the cladding material. If mixed, the adhesion between the base material and the composite material is deteriorated, and the base material and the composite material are difficult to be integrated even when hot rolling or cold rolling is performed after lamination, and there is a problem that they are easily separated.

[0006] Further, when welding a joining material to a slab, the thickness of the joining material is required to be 4-5 mm or more, and even if it is attempted to make it thinner, a hole is formed by welding. Must be performed in a vacuum,
There is a problem that is expensive.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has an object to provide a metal layer having a good adhesion to a slab and having an arbitrary thickness different from the slab on the surface of the slab. Is an issue.

[0008]

In order to achieve the above object, the present invention provides, as a first method, a method in which a porous metal is brought into contact with the surface of a slab, and then the slab and the porous metal are welded to each other. Then, a metal powder made of a metal different from the slab is sprayed or applied to the metal porous body, and the metal powder is filled in the pores of the metal porous body, and then the metal powder filled in the hole is filled with the metal powder. Press tightly until it is impossible to drop off and fasten, then weld the metal powder to the metal porous body and the slab, form a metal layer composed of the metal powder and the metal porous body integrally with the slab, and then And hot rolling and cold rolling are provided.

A porous metal body is simultaneously brought into contact with both sides of the slab and welded to the slab, and a metal powder is adhered to the metal slab. The porous metal body and the metal powder are formed on both sides of the slab. A metal layer may be formed, but the wide surface of the slab is transported horizontally, a porous metal body is placed on the upper surface and welded, and then the metal powder is sprayed or applied to the upper surface side of the slab. It is preferable to form the metal layer by filling the pores of the porous metal body. When metal layers are formed on both sides of the slab, it is preferable to form the metal layer on each side of the slab. That is, welding of the porous metal body to the upper surface of the slab, filling of the pores of the porous metal body with the metal powder, compaction pressing of the metal powder, and welding of the metal powder to the porous metal body and the slab are performed. After that, the slab is turned over, the porous metal body and the metal powder are welded to the slab surface on the other surface of the slab on the upper surface side in the same procedure as above, and the metal comprising the porous metal body and the metal powder is provided on both surfaces of the slab. Layers are provided.

Welding a porous metal body to the slab;
The welding of the metal powder to the metal porous body and the slab is performed by sintering, induction heating, seam welding or spot welding.

The porous metal body has a lattice shape, a shape provided with round holes and polygonal holes, or a foamed shape. These metal porous bodies have a porosity of 50% to 99%, preferably 90% to 98%. The thickness is 0.5m
m to 50 mm.

As described above, if the porous metal body is first attached to the surface of the slab, when the metal powder is sprayed or applied, the pores of the porous metal body are filled with the metal powder and the metal powder falls off. It is possible to provide a metal layer made of a metal powder and a metal porous body having a predetermined thickness according to the thickness of the metal porous body without performing the above.

Instead of the method of attaching the porous metal body to the surface of the slab as described above, the metal powder may be directly sprayed or applied to the surface of the slab without using the porous metal body. That is, the present invention provides, as a second method, spraying or applying a metal powder of a different type from the slab, pressing the sprayed or applied metal powder, and then welding the metal powder to the slab to form a slab. A metal layer made of a metal powder is integrally formed on one surface, and then the slab is inverted and the metal layer is integrally formed on the other surface of the slab in the same procedure as described above. A method for producing a rolled metal sheet is provided.

The method of welding the metal powder and the slab is performed by sintering, induction heating, and seam welding as described above.

The pressure applied after the metal powder is filled into the pores of the porous metal body according to the first method or after the metal powder is applied or sprayed on the surface of the slab according to the second method is from 1 kg / mm. While gradually increasing the load with a load of 500 kg / mm, the gap between the metal powders is substantially eliminated, and the pressurization is repeated until the metal powders cannot drop off.

As described above, when the porous metal body and the metal powder or the metal powder are pressed and then welded to the slab, they can be firmly fixed and integrated with the slab, and can be integrated in a reducing gas atmosphere at about 1250 ° C. in the next step. During the hot rolling, no oxide film is formed on the surface of the slab, and the adhesion between the slab, the porous metal body, and the metal layer composed of the metal powder or the metal powder alone can be improved.

When the metal layer is formed on the surface of the slab as described above, the surface area of the slab is smaller than that of a hot-rolled steel plate or a cold-rolled steel plate, so that the formation of the metal layer is short. It can be performed in a short time, and productivity can be increased. In addition, since hot rolling and cold rolling are performed after forming the metal layer on the slab surface, the thickness of the metal layer can be made extremely thin, for example, about 2 μm. Further, a metal layer made of a metal powder that is difficult to form by plating, for example, a metal powder such as aluminum can be easily formed on the surface.

Specifically, conventionally, for example, a plate thickness of 250 mm
When the slab is hot rolled and cold rolled to a plate thickness of 0.25 mm, the surface area per weight is about 1000 times. In other words, the surface area of the slab is 1/1000 of the cold-rolled steel sheet. Therefore, when the metal layer is formed on the surface of the slab, compared with the case where the metal layer is formed on the surface of the cold-rolled steel sheet, the metal layer only needs to be formed on a surface area of 1/1000. A metal layer can be formed in a short time with high productivity.

The average particle size of the metal powder is 1 μm to 300 μm.
μm of Ni, SUS, Cu, Al, Ti, Fe or In, Ca, Ag, Ge, Co, Sn, Sr, Se, P
b, Ba, Bi, B, Be, Mn, P, Cr, Si,
Metal powder of C, Fe, Zn, La, W, Mo, Ga
It is preferable to use one or more kinds mixed with metal powder composed of Ni, SUS, Cu, Al, Ti or Fe. Among these metal powders, those having a large bulk density are preferably used. That is, when the bulk density is high, the gap between the metal powders can be reduced when sprayed on the slab surface,
The area that comes into contact with air during compression can be reduced, and oxidation can be suppressed. As this metal powder, Ni carbonyl powder having a small particle size and a large bulk density is most preferably used.

On the other hand, the base material composed of the slab is F
e, SUS, Al, Cu, Ti, and Ni. The base material differs from the metal powder in the type of metal. The metal layers made of metal powder provided on both surfaces of the slab surface serving as the base material may have the same or different types of metal and the same or different thicknesses of the metal layers.

Further, the surface of the metal powder layer may be plated after hot rolling or cold rolling. According to this method, the thickness of the plating layer can be reduced, and a metal layer composed of a plating layer different from the metal powder layer can be provided.

When plating, Ni plating or Ni, Mn, Ag, Ge, Co, Sn, Se, B,
Alloy plating of one or more of P, Si, Fe, Zn, La, W, Ti, Mo, and Ga is preferably used. Also, for example, when forming a prismatic battery can,
If the metal layer formed from the powder is soft, slippage during pressing is poor and the abrasion of the mold is large. Therefore, it is preferable to apply hard plating.

The present invention also provides a metal plate manufactured by the above method. In addition, at least one surface of a base material formed from a slab manufactured by a method other than the above method is provided with a metal layer formed of a porous metal body and a metal powder, or a metal layer formed of a metal powder, and the metal layer is formed of a slab. A metal plate made of a metal different from the metal of the metal layer and the metal of the slab is also included in the scope of the metal plate of the present invention.

The total thickness of the metal plate, the thickness of the base material composed of the slab, and the thickness of the metal layer formed on the surface of the base material differ depending on the use of the metal plate. For example, if the thickness of the base material made of the slab is 0.01 mm to 3 mm and the thickness of the metal layer made of the metal powder is 30 μm or less, it is suitably used as a battery can material.

When metal layers are formed on both surfaces of the slab, the metal layers on both surfaces are made of the same or different metal and have the same or different thickness. For example, the slab is Fe, SUS, and Ni is
When a metal layer is provided, it is suitably used as a material for forming an alkaline dry battery can or an alkaline storage battery can. When the slab is made of Fe or SUS, one surface is made of a Ni metal layer, and the other surface is made of a Cu metal layer, it is suitably used as a material for forming a button type battery or a negative electrode case. When the slab is made of Al and a metal layer made of Ni, Fe, Cu, SUS or Ti is provided on one side, it is suitably used as a material for forming a battery can for a lithium battery. Further, when a slab is provided with Cu, a Ni metal layer on one surface and a SUS metal layer on the other surface, the slab is suitably used as a terminal forming material.

The present invention further provides a battery can formed from the above-described battery can-forming material, and a battery provided with the battery can.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. In the first embodiment, as shown in the flowchart of FIG. 1, in a first step, a porous metal body is placed on the slab surface, in a second step, the porous metal body is welded to the slab, and in a third step, the metal powder is removed. The metal powder is filled into the pores of the porous metal body by spraying, and pressure is applied until the metal powder does not fall off in the fourth step, and the metal powder, the slab and the porous metal body are welded in the fifth step, and one side of the slab is formed. Then, a metal layer is formed. Then, in the sixth step, the slab is turned over and the first
Perform the same seventh to eleventh steps as the fifth to fifth steps to form metal layers on both surfaces of the slab. Thereafter, a hot-rolled steel plate is subjected to hot rolling in a twelfth step, cold-rolled in a thirteenth step, and temper-rolled in a fourteenth step. We manufacture metal plates consisting of

More specifically, in the first step, as shown in FIG. 2A, the cast slab 1 is cut into a predetermined length to obtain a fixed length, and the wide surface of the slab 1 is horizontally set. The metal porous body 2 is placed over the entire upper surface of the slab 1. The thickness of the porous metal body 2 is 0.5 mm to 50 mm.
mm, and the porosity is 50% to 99%, preferably 9%.
0% to 98% is used. In this embodiment, a foamed metal body formed by plating a urethane foam sheet and then removing and sintering it is placed. After placing the porous metal body 2 on the slab 1 in this way, spot welding in the second step is performed to partially weld the porous metal body 1 to the slab 2,
The porous metal body 1 is fixed to the slab 2.

Then, as shown in FIG. 2B, the metal powder 3 is sprayed from above the metal porous body 2 in the third step, so that the metal powder 3 is filled in the pores 2a of the metal porous body 2.
The average particle size of the metal powder 3 is about 1 μm to 300 μm,
A material having a large bulk density is used.

Next, as shown in FIG. 2 (C), in order to perform the pressing in the fourth step, a load 4 kg / mm ^{2 to} 100 kg / m ^{2 is} applied by the roll 4 having the same length as the width W of the slab 1.
Pressurization is performed with a reduction amount of m ² . By this pressing, the metal powder 3 and the metal porous body 2 are fastened so that the metal powder 3 cannot be dropped. At this time, the pressure may be increased in a plurality of stages by gradually increasing the amount of reduction.

Then, it is carried into a sintering furnace and heated in a non-oxidizing atmosphere at a temperature equal to or lower than the melting point of the metal powder to be used, and the fifth step of welding is performed. In this annealing step, the metal porous body 2 and the metal powder 3 are welded to the slab 1, the metal porous body 2 and the metal powder 3 are also welded to each other, and the metal powders 3 are also welded to each other. Thereby, the metal layer 10 composed of the metal porous body 2 and the metal powder 3 is fixed to one surface of the slab 1 and can be formed in an integrated state.

Next, as shown in FIG. 2D, the slab 1 is inverted in the sixth step, and the lower surface is set as the upper surface. Thereafter, the same seventh to eleventh steps as the first to fifth steps are performed to form metal layers 10 and 10 made of the porous metal body 2 and the metal powder 3 on both surfaces of the slab 1.

Then, it is passed through a hot rolling machine to reduce the rolling ratio to 9
The twelfth step hot rolling is performed at 7% to 99.9%.
Then, it is passed through a cold rolling machine, and cold-rolled in a thirteenth step at a rolling ratio of 50% to 95%, and rolled to a finished product thickness of 1 to 3% before the final product. After cold rolling,
Temper rolling is performed at a rolling rate of 0.3% to 3% to manufacture a metal sheet 100 made of a target cold-rolled steel sheet.

After the cold rolling, the steel sheet is passed through an annealing furnace and subjected to batch annealing in a reducing gas atmosphere (550 ° C. to 800 ° C., 24 ° C.).
Time to 48 hours) or continuous annealing (600 to 1200)
C. for 0.5 to 3 minutes), followed by annealing and then temper rolling.

The metal plate 10 made of a cold-rolled steel sheet manufactured by the above method has a metal layer 10 formed of a metal porous body 2 and a metal powder 3 on both surfaces of a base material made of a slab 1. The thickness is 0.01 mm to 3 mm, and the thickness of the surface metal layer is 30 μm or less, preferably 10 μm or less.

[0036]

EXPERIMENTAL EXAMPLE 1 A slab having a thickness of 40 mm was formed on one side of a slab.
4 mm, porosity 96%, pore size 400 μm (50 pp
The nickel foam of i)) was placed and fixed to the slab by spot welding. Next, nickel carbonyl powder having a particle size of 8 to 15 μm and a bulk density of 3.5 g / cc was sprayed and filled into the pores of the nickel foam. Then, pressure was applied between the rollers until the metal powder did not fall off, and the metal powder was fixed. Then, it is carried into a sintering furnace, and in a non-oxidizing atmosphere,
Heating was performed at 1100 ° C. for 1 hour to form a metal layer composed of a nickel foam and nickel carbonyl powder on one surface of the slab. Then, the slab was inverted, and a metal layer made of a nickel foam and nickel carbonyl powder was formed on the back surface of the slab on the back surface in the same manner as described above. The step of carrying the sintering furnace on the back side and sintering it is omitted in the subsequent hot rolling step because sintering is performed at an elevated temperature of hot rolling. Next, the temperature was raised to 1250 ° C. to perform hot rolling, then to cold rolling, and finally to temper rolling,
A cold-rolled steel sheet having a thickness of 0.25 mm and having a 3 μm nickel layer on both sides was manufactured.

FIG. 3A is a flow chart showing a first modification of the first embodiment, in which plating is performed after cold rolling in step 13 of FIG. 1 to form a metal layer composed of a porous metal body and metal powder. A plating layer made of a metal different from the metal layer is formed on the surface. Annealing is performed after the plating, and finally temper rolling is performed. FIG. 3B is a flowchart showing a second modified example, in which a metal layer composed of a porous metal body and a metal powder is formed only on one surface of a slab.
Therefore, after a metal layer is formed on one surface of the slab, hot rolling and cold rolling are performed. FIG. 3 (C) is a flowchart showing a third modification, in which a porous metal body is brought into contact with both sides of the slab and fixed by spot welding, and then a metal powder is applied to the porous metal bodies on both sides. Fastened between rollers. Next, hot rolling is performed and sintering is performed at the same time.

In the above-described embodiment, a metal plate is manufactured in a batch manner by cutting a slab to a fixed size. However, the slab is continuously conveyed, and a metal sheet formed of a continuous sheet is formed on the slab. The porous body is continuously arranged, and the porous metal body is welded to the slab by passing through an annealing furnace at a required position.Then, the metal is sprayed on the slab and the metal porous body to be continuously conveyed, and then the metal is passed between rollers. After that, the metal sheet may be carried into an annealing furnace and welded to continuously manufacture a metal plate.

FIG. 4 is a flowchart of the second embodiment. In the first step, metal powder is sprayed on the upper surface of the slab.
In the second step, pressurize until the metal powder cannot fall off,
In a third step, the metal powder is welded to the slab to form a metal layer on one side of the slab. Next, the slab is reversed in the fourth step, and the same fifth to seventh steps as those in the first to third steps are performed to form metal layers on both surfaces of the slab. Then, hot rolling is performed in an eighth step, cold rolling is performed in a ninth step, temper rolling is performed in a tenth step, and a cold-rolled steel sheet having a metal layer made of a dissimilar metal on both surfaces of a base material made of a slab We manufacture metal plates consisting of As described above, the method of the second embodiment is different from the method of the first embodiment only in that a porous metal body is not used.

Specifically, as shown in FIGS. 5A and 5B, the slab 1 cut to a fixed size is accommodated in an outer frame 20 having an upper surface opening. At this time, the size of the slab 1 is just fitted to the inside of the outer frame 20, and the outer frame 20 is the surface 1 a of the slab 1.
A required dimension (about 1.4 mm in this embodiment).

Next, the metal powder 3 of the first step is sprayed on the entire surface of the slab 1. The amount of the metal powder to be sprayed is calculated backward from the thickness of the final Ni layer so that the metal powder has a predetermined thickness, and the amount of the metal powder slightly projecting from the upper surface of the outer frame 20 is sprayed. The method of spraying the metal powder is not limited, for example,
The metal may be sprayed through a shaker, or may be sprayed through rollers between chutes.

Next, as shown in FIG. 5C, a plate 21 slightly larger than the surface area of the slab 1 is rubbed on the upper surface of the outer frame 20 so that the thickness of the metal powder 3 is reduced. Approximately match height.

Then, as shown in FIG. 5 (D), the roll 4 having the same length as the width W of the slab 1 is used to load 200 kg.
The metal powder layer 25 is formed by pressurizing at a reduction amount of / kg to 400 kg / mm and tightening so that the gap between the metal powders 3 is substantially eliminated so that the metal powder cannot fall off.

Next, a third step of welding the metal powder layer 25 that has been fastened to the slab 1 is performed. In this embodiment, seam welding is used. That is, as shown in FIG. 5E, a roll-shaped disk electrode 22 connected to the positive terminal of the power supply.
Is moved while rotating the entire surface of the metal powder layer 25 on the surface of the slab 1 connected to the negative side of the power supply to perform seam welding.

At this time, the welding voltage is 10 V to 50 V, and the current is 100 A to 500 A. The disk electrode 22 is moved in the vertical and horizontal directions so as to be in contact with the entire surface of the metal powder layer 25, and is brought into contact with the entire surface of the metal powder layer 25 two to three times to slab the metal powder 3 of the metal powder layer 25. 1 until it is completely welded to the surface. The disk electrode 22 may be connected to the minus side, and the slab may be connected to the plus side.

After the metal powder layer 25 is formed into a metal plate 10 ′ integrated with the slab 1 by seam welding as described above, the slab 1 is inverted in a fourth step to perform the first to third steps.
Perform the same fifth to eighth steps as the steps,
A metal layer 10 'is formed on both sides of the slab. Then, the ninth
In the step, as in the first embodiment, hot rolling is performed,
Cold rolling is performed in step 0, temper rolling is performed in the eleventh step, and a metal plate 100 ′ made of a cold-rolled steel sheet having a metal layer 10 ′ made of a dissimilar metal on both surfaces of a base material made of a slab is manufactured. I have.

The metal plate 100 ′ manufactured by the above method is
As shown in FIG. 6, a metal base 10 ′ formed from a metal powder 3 is provided on both sides of a steel base material made of the slab 1, the thickness of the metal plate 100 ′ is 0.1 mm to 3 mm, and the metal layer 10 ′. Has a thickness of 30 μm or less, preferably 10 μm or less.

Also in the case where the method of the second embodiment is adopted, plating may be performed after cold rolling or after hot rolling as in the case of the first embodiment. Further, a metal layer made of metal powder may be provided only on one side of the slab.

[0049]

[Experimental example 2] A slab (Fe) having a thickness of 40 mm was coated with a particle size of 8
A Ni carbonate powder having a thickness of 1.4 mm and a thickness of 3.5 g / cc is sprayed on the plate 21 and cut off with a plate 21. Next, the surface of the metal powder was rolled three times at 100 kg / mmW using a roll 4 having a diameter of 150 mm to fasten the metal powder. Then, the metal powder layer was seam-welded at 15 V and 300 A, and the nickel metal layer 10 ′ was welded to the slab 1 to be provided integrally. Turn the slab upside down,
The same processing was performed on the lower surface side to form a nickel metal layer 10 '. After forming a nickel metal layer on both sides of the slab, the temperature was raised to 1250 ° C., hot rolling was performed at a rolling reduction of 93.75%, and then cold rolling was performed at a rolling reduction of 90% to prepare a metal plate. . This metal plate has a total thickness of 0.25 mm,
A 3 μm thick Ni metal layer was formed on both front and back surfaces.

[0050]

[Evaluation test] For the metal plates (cold rolled steel plates provided with dissimilar metal layers on both sides) manufactured in Experimental Examples 1 and 2,
A 180 degree bending was performed three times, and a peeling test was performed in which the peeling state of the metal layer formed on the steel sheet surface was visually observed.
Further, a salt spray test according to JIS C 0023 was performed.
As a result, in the peel test, the metal plate 1 manufactured in the first experimental example was used.
No peeling of the metal layers 10, 10 'was observed in any of the metal plates 100' manufactured in the second experimental example.

In addition, a salt water spray test was performed on a conventional cold-rolled steel sheet which had been generally manufactured and subjected to Ni plating, annealed and skin-pass rolled, and a comparison was made. And had corrosion resistance equal to or higher than that of a conventional plated steel sheet.

Further, the metal plates 100 and 100 'were press-formed to form a cylindrical battery can. A battery can of a comparative example was also formed from a plated steel sheet obtained by subjecting the above-described ordinary cold-rolled steel sheet to Ni plating, and performing annealing and skin pass rolling, and performed a comparative test of press workability. The test method of the press workability is described in Experimental Examples 1 and 2 of the present invention.
Using the metal plate manufactured in the above and the metal plate of the above-mentioned ordinary comparative example, the battery can is formed by using three types of drawing processes including transfer processing, DI processing, and processing using a combination of transfer processing and DI processing. Formed. As a result, the workability when processing using the metal plate of the present invention was the same as that when processing using the normal metal plate of the comparative example, and the battery can was formed by drawing using the metal plate of the present invention. No problem occurred even if it was formed.

When the metal plate is used as a substrate for a battery electrode, the thickness of the metal plate is 0.1 mm to 0.8 mm, and the thickness of the Ni plating layer on the surface is 1 μm to 5 μm.

[0054]

As is apparent from the above description, according to the present invention, instead of the conventional method of hot rolling or cold rolling a slab to form a thin plate and then plating, the surface of the slab is coated with metal. Since the metal layer composed of powder or metal powder and a metal porous body is formed, compared to the case where the metal layer is formed by plating after hot rolling and cold rolling to a required thickness and thinning, Since the length per weight of the steel sheet is reduced and the surface area for forming the metal layer is correspondingly small, the metal layer composed of the metal powder or the metal powder and the metal porous body can be formed in a short time. As a result, the productivity is improved, a large amount of surface treatment can be performed in a short time, and the required time can be reduced to 1/4 as compared with a case where a conventional cold-rolled steel plate is plated. According to the present invention, the total manufacturing cost can be reduced by about 25%.

In particular, when a metal layer is formed by spraying or applying a metal powder on the surface of a steel sheet and forming a metal layer by seam welding, an air layer can be eliminated between the slab and the metal layer so that hot rolling can be performed. Is not formed, the adhesion between the slab and the metal layer is improved, and peeling of the metal layer from the slab can be reliably prevented.

In the case where the plating process is omitted, a large-sized plating device required for the plating process is not required.
The power consumption required for the surface treatment can be reduced to substantially zero, and as a result, a significant cost reduction can be achieved. Further, there is an advantage that it is not necessary to manage the plating solution and drainage.

[Brief description of the drawings]

FIG. 1 is a flowchart illustrating a method according to a first embodiment of the present invention.

FIGS. 2A to 2D are schematic views of respective steps.

FIGS. 3A to 3C are flowcharts showing modified examples of the method of the first embodiment.

FIG. 4 is a flowchart of a method according to a second embodiment.

5 (A), 5 (C), 5 (D) and 5 (E) are schematic views showing respective steps, and FIG. 5 (B) is a sectional view of FIG. 5 (A).

FIG. 6 is a sectional view of a metal plate manufactured in a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Porous metal body 3 Metal powder 100, 100 'Metal plate

Claims (10)

[Claims] After the porous metal is brought into contact with the surface of the slab, the slab and the metal porous body are welded, and then a metal powder made of a metal different from the slab is sprayed or applied to the metal porous body. Then, the metal powder is filled in the pores of the porous metal body, and then pressurized and tightened until the metal powder filled in the pores cannot drop off, and then the metal powder is filled with the metal porous material and A method for producing a metal sheet, comprising: welding a slab to form a metal layer composed of a metal powder and a porous metal body integrally with the slab; and then performing hot rolling and cold rolling. 2. A method of welding a porous metal body to one surface of the slab,
After filling the pores of the porous metal body with the metal powder, compacting and pressurizing the metal powder, and welding the metal powder to the porous metal body and the slab, the slab is turned over and the other surface of the slab is inverted. The method for producing a metal plate according to claim 1, wherein the porous metal body and the metal powder are welded to the surface of the slab by the same procedure as above, and a metal layer made of the porous metal body and the metal powder is provided on both surfaces of the slab. 3. The method for manufacturing a metal plate according to claim 1, wherein the porous metal body has a lattice shape, a shape provided with round holes, polygonal holes, or a foamed shape. 4. A metal powder of a different type from the slab is sprayed or applied to one surface of the slab, and the sprayed or applied metal powder is pressurized.
The metal powder is welded to the slab to integrally form a metal layer made of the metal powder on one surface of the slab, and then the slab is inverted and the metal layer is integrally formed on the other surface of the slab in the same procedure as described above. And thereafter performing hot rolling and cold rolling. 5. The welding of the porous metal body to the slab, the welding of the metal powder to the metal porous body and the slab, or the welding of the metal layer to the slab are performed by sintering, induction heating, seam welding, and spot welding. The method for manufacturing a metal plate according to any one of claims 1 to 4, wherein: 6. A metal plate formed by the method according to claim 1. Description: 7. A base material formed from a slab is provided on at least one side with a metal layer made of a porous metal body and a metal powder, or a metal layer made of a metal powder, and the metal layer is welded to the slab and integrated therewith. A metal plate made of a metal different from the metal of the metal layer and the metal of the slab. 8. A battery can-forming material comprising the metal plate according to claim 6. 9. A battery can formed from the battery can-forming material according to claim 8. 10. A battery provided with the battery can according to claim 9.