KR20170040769A - Bonding method of material and bonded material using the same - Google Patents

Abstract

According to the present invention, a method of bonding materials relates to a method of bonding a first material and a second material, comprising: a step of spraying droplets of melted bonding materials to a first bonding surface of a first material and a second bonding surface of a second material; a stacking starting step of forming a thermal spraying layers on the bonding surfaces by stacking splats generated by collision of the droplets on the first bonding surface and the second bonding surface; and a step of connecting each of the thermal spraying layers after the stacking starting step or at the same time as the stacking starting step. As such, the present invention aims to provide a method of bonding materials using a thermal spraying technique.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of bonding a material,

One aspect relates to a method of joining materials and a bonded body of materials using the same, and more particularly, to joining materials by thermal spray.

The present invention also relates to a cylindrical steel pipe in which stainless steel is clad and a manufacturing method thereof, and more particularly, to a cylindrical steel pipe produced by high frequency welding using a stainless steel clad steel plate formed by cladding a stainless steel plate to a steel plate , A high-performance stainless steel clad steel pipe superior in corrosion resistance, abrasion resistance, durability and the like compared to existing steel pipes and a method for manufacturing the same.

A thermal spray is a method of melting and injecting a metal, and a splat is generated on the surface of a sprayed article by colliding with a molten droplet. The splat is formed while being infiltrated or flattened along the surface of the surface to be irradiated, and the later formed splat forms a sprayed layer while being laminated on the previously formed splat.

Typically, the sprayed layer is used to form a film for surface modification such as rust prevention, corrosion resistance, high temperature resistance, hardness, abrasion resistance, insulation, etc. The materials used for spraying are aluminum, chromium, zinc, Boron and the like are used.

On the other hand, the properties of the sprayed layer are often distinguished from ordinary bulk materials or plated layers and, in ideal conditions, they usually form a lamellar structure of a non-isotope parallel to the interface, Permeated oxygen, and the like.

The thickness of the film can be controlled regardless of the size of the workpiece. The thickness of the film can be easily adjusted by repeating the number of spraying, and it is possible to coat most of the solid materials. I can do it.

In addition, since the metal spray is a porous coating, it has excellent lubricity, lubricity, and abrasion resistance because it has an oxide. Also, the spraying apparatus can be relatively easily performed since it is small, can be moved easily, does not require a lot of equipment cost, and can be skillfully performed in a short time.

However, spraying is used only as a method for forming a spray coating film on one side as described above, and there is no case where the bonding force for attaching two objects to each other is used.

On the other hand, steel structures, especially steel for piping, have a fatal disadvantage of being easily knocked. Therefore, there are many national and social economic losses due to the unsanitary problem that the rust in the drinking water comes out due to aged corrosion corrosion water pipe in the country and the breakdown of the pipe in the underground ground. Currently, the most widely used stainless steel plate for piping is 304 austenitic stainless steel plate, which is made of 18 wt% nickel. Such stainless steel plate shows excellent corrosion resistance and processability and is excellent in welding.

However, the austenitic stainless steel has a disadvantage of high price because it contains expensive nickel.

On the other hand, Korean Patent No. 10-1353815 proposes a clad steel plate made of stainless steel / aluminum / stainless steel, which is known to be mainly used in the manufacture of kitchen containers. However, it is not easy to produce a clad steel pipe in the form of a container formed by deep drawing. The reason is that aluminum is dissolved due to the high thermal conductivity (60%) of aluminum due to the high heat generated in high frequency welding, and the aluminum moves to the outside of the welded portion of the stainless steel, thereby causing interference with the welding. That is, fusion of stainless steel and aluminum does not occur.

Therefore, when a clad steel pipe is manufactured by the above-described method, a space is formed in which the aluminum is not filled around the outer periphery of the intermediate aluminum and the clad steel pipe, so that the structural function of the clad steel pipe, such as bonding strength, hardness, corrosion resistance, It does not have high functionality. Also, since the aluminum is thickly inserted into the intermediate side base material, the manufacturing cost is high.

BACKGROUND ART [0002] In general, as a technology of a structure in which a conventional stainless steel is laminated, Korean Patent Laid-Open No. 10-1997-0073462 discloses an induction heating cooking vessel and a method of manufacturing the same, in which a metallic steel plate or a stainless steel plate is firmly and efficiently bonded and bonded Conventionally, a method of spraying an iron-based powder having a magnetic substance on the surface of an aluminum or alumyrinium alloy, or a method of embedding a wire mesh or the like into a magnetic body is introduced.

In Korean Patent Laid-Open No. 10-1998-0051094, a copper layer having a high heat transfer coefficient is coated on the surface of a centrifugally cast roll, and a stainless steel layer having a low heat transfer characteristic is formed on the copper-coated surface by a spray coating method And coating the surface of the spray-coated stainless steel with either a chromium carbide or a Co-based alloy.

In addition, Japanese Utility Model Registration No. 3013825 discloses a coating film of a metal or alloy selected from zinc plated steel and a low-temperature sprayed zinc, zinc alloy, aluminum, aluminum alloy, magnesium, magnesium alloy, , Or a metal coating film having a metal low-temperature plastic coating film characterized by comprising a coating film of a fluorocopolymer containing a hydroxyl group, which is applied to the primer coating film without using the primer coating, as a vehicle Japanese Unexamined Patent Application Publication No. 2004-249367 discloses an austenitic stainless steel plate, an iron or iron alloy plate having magnetic properties coated with aluminum, an aluminum or aluminum alloy plate, and an austenitic stainless steel plate, Thereby forming an aluminum / stainless steel clad sheet The technology that sex has been proposed.

Japanese Patent Application Laid-Open No. 1995-054367 proposes a manhole cover composed of a clad material formed by pressing a stainless steel plate to an iron plate serving as a substrate.

However, the clad plates coated or bonded with such stainless steel have very low practicality due to the inconvenient problems such as the manufacture of steel pipes, the manufacture of various shapes, to be.

As a conventional method for manufacturing a cylindrical steel pipe, Korean Patent Laid-Open Publication No. 2001-67599 discloses a feed mechanism for feeding a proper amount of steel strip, an open-tube forming mechanism that gradually forms a circular tube shape while the steel strip is continuously moved, A method of manufacturing a steel pipe having a drawing mechanism for continuously moving a welded pipe, the method comprising: guiding both ends of the open pipe to be continuously moved while accommodating the open pipe to be continuously moved; So that the welding electrode can be changed at the same time as the head portion.

Generally, the manufacturing principle of the cylindrical pipe is such that the first and second rollers constituting the forming machine are passed through the metal plate to gradually form a pipe shape, and the welding is performed at the last step, However, in the case of a steel sheet in which a heterogeneous sheet material is clad other than a single material, research on the manufacturing method of a cylindrical pipe is not actively carried out, and its manufacture is not easy.

Korea Patent No. 10-1353815 Korean Patent Publication No. 10-1997-0073462 Japanese Registered Utility Model No. 3013825 Japanese Patent Application Laid-Open No. 2004-249367 Japanese Patent Laid-Open No. 1995-054367 Korean Patent Publication No. 2001-67599

An object of one aspect of the present invention is to provide a bonding of materials using a thermal spray.

Another object of the present invention is to solve the problem of cladding a stainless steel plate to a steel plate and to solve the problem of poor bonding which occurs when a steel pipe or various sections are manufactured.

Another object of the present invention is to provide a cylindrical steel pipe manufactured by using a stainless steel clad sheet having a clad of a stainless steel plate on a steel plate.

Another object of the present invention is to provide a method for continuously and continuously producing a cylindrical steel tube clad stainless steel by high frequency welding so as to have excellent physical properties such as corrosion resistance and excellent bonding properties.

In order to solve the problems of the present invention as described above, the present invention provides a bonding method of a first material body and a second material body, wherein a droplet of the molten bonding material is bonded to a first bonding surface of the first material body, A spraying step of spraying the sprayed powder onto a second joint surface of the sprayer; And a splitting start step of forming a sprayed layer on the joining surfaces by laminating splats caused by collision of droplets on the first joining surface and the second joining surface; And a joining step of joining the sprayed layers together after or simultaneously with the start of the lamination step.

The present invention also provides a method of manufacturing a semiconductor device, A second material body; And a thermal spraying bonding layer provided between the first material body and the second material body, wherein the thermal spray bonding layer includes a laminate of splats generated when droplets of the molten bonding material collide with each other, A joined body of a material having a sprayed joint surface is provided on both of the joint surfaces of the material body and the second material body.

The present invention also relates to a method of manufacturing a cladding material, comprising the steps of: cladding a second tube on a surface of a first plate, wherein the cladding layer is provided between a first plate and a second plate, And a sprayed joint surface is provided on both the joining surfaces of the first plate and the second plate.

The present invention also relates to a steel tube having a second tube clad on the surface of a first tube, the spray tube comprising a sprayed bonding layer provided between the first tube and the second tube, A cladding tube including a laminate of splats caused by collision, the cladding tube having a sprayed joint surface on both joint surfaces of the first and second tubes.

The present invention also provides a stainless steel clad cylindrical steel pipe including a structure in which a steel plate is used as a base material and a stainless steel plate is clad-rolled.

According to another aspect of the present invention, there is provided a method of manufacturing a stainless steel clad steel sheet, comprising the steps of: preparing a stainless steel clad sheet by cladding a stainless steel sheet on a surface of a steel sheet; Forming a cylindrical open pipe so that both ends of the stainless steel plate are in contact with each other while forming a cylindrical pipe; Forming a steel pipe by high frequency welding the welded portion of the open pipe; And rolling the welded portion welded by the high frequency welding so that the welded protruded portion is in the same plane as the inner and outer surfaces of the steel pipe, and a method of manufacturing the cylindrical steel pipe clad with stainless steel.

According to the method of joining materials according to the present invention, conventional materials can be bonded by a simple method called thermal spray, so that the production cost can be remarkably reduced and a strong bonding force can be obtained. As a result, it is applicable to a large number of products.

For example, in the stainless steel clad steel pipe according to the present invention, steel pipe and stainless steel pipe are steel-clad-rolled steel pipes, and the steel pipe is formed into a cylindrical shape by an effective method. Thus, a clad steel pipe can be mass- , The heterogeneous plate materials of the respective clad plates are bonded by high-frequency preheating and high frequency welding, and the bonding property of the stainless steel clad steel tube is very excellent.

In addition, since the stainless steel clad sheet according to the present invention has excellent bonding properties between steel and stainless steel, it is possible to maintain the excellent physical properties of the stainless steel clad sheet as the base material even in the course of processing into a steel tube, and has excellent hardness, corrosion resistance and abrasion resistance So that it is widely applicable to steel structures requiring corrosion resistance.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram illustrating a method of joining materials according to an embodiment of the present invention. FIG.
2 is an explanatory view for explaining a pressurizing process of the embodiment according to the present invention.
3 is a cross-sectional view of one embodiment of a bonded body of material according to the present invention.
Figure 4 is a cross-sectional view of another embodiment of a bonded body of material according to the present invention
FIG. 5 is an example of a stainless steel clad steel sheet used for manufacturing a cylindrical steel pipe according to the present invention, showing a steel sheet structure in which the thermal spray bonding layer is formed by a single thermal spray bonding layer in a single region.
FIG. 6 is an illustration of a steel sheet structure showing a structure in which a thermal sprayed layer is formed as a single thermal sprayed joint layer region at both side ends and a composite sprayed joint layer region at the center, according to an embodiment of the stainless steel clad sheet according to the present invention.
FIG. 7 illustrates a structure of a stainless steel clad sheet according to an embodiment of the present invention, in which the structure of the thermal sprayed bonding layer has a single thermal sprayed joint layer region at both side ends and a single thermal sprayed joint layer region and a composite sprayed joint layer region alternately formed Fig.
FIG. 8 is a schematic view illustrating a method of applying a cutting device to a steel pipe end according to the present invention.
Fig. 9 is a view showing a partially cut steel pipe structure (a) and a steel pipe cross-sectional shape (b) before cutting the front end portion of the steel pipe manufactured according to the present invention.
Fig. 10 is a view showing a structure in which the tip end of a steel pipe is cut, showing a partially cut-out three-dimensional structure (a) and a cross-sectional shape (b) of the steel pipe front end before the finishing process.
Fig. 11 is a view showing the partially cut-out three-dimensional structure (a) and the cross-sectional shape (b) of the steel pipe front end after the finishing process of the front end of the steel pipe.
12 is a process diagram illustrating a manufacturing process of a stainless steel clad pipe according to the present invention.

Hereinafter, the present invention will be described in more detail as an embodiment.

It should be understood, however, that there is no intent to limit the scope of the present invention to the particular embodiments or examples disclosed, and that ordinary skill in the art, having the benefit of the teachings of the present invention, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Fig. 1 is an explanatory view for explaining a method of joining materials. Fig. According to this aspect, a method of joining materials according to one aspect of the present invention includes a spraying step, a lamination starting step, and a connecting step.

The spraying step is a step of spraying the droplets of the molten bonding material simultaneously or individually onto the bonding surface of the first material body 1 and the bonding surface of the second material body 2 (Fig. 1A). At this time, A minute event or two or more minute events can be used.

At this time, the materials of the first material body 1 and the second material body 2 to be bonded are not limited, but usually metals, ceramics, alloys, and the like can be bonded. On the other hand, the bonding material to be sprayed is not limited as long as it is a material which can be sprayed. Generally, metals, ceramics, alloys, composites and the like can be used as the spraying material.

As the injection method, a known injection method can be used. For example, wire spraying, electric arc spraying, powder flame spraying, high velocity recycling process, arc plasma process, induction plasma spray, and the like can be selectively used.

The size and speed of the droplets to be sprayed can be varied by those skilled in the art depending on the type of the material to be bonded.

The lamination starting step is a step of laminating splats generated by collision of the bonding material droplets with the bonding surface 1a of the first material body 1 and the bonding surface 2a of the second material body 2, The first sprayed layer 3 and the second sprayed layer 4 are formed on the substrate 1. (Fig. 1B)

The droplets ejected on the respective bonding surfaces deform as they are collided with each other, deformed according to the surface shape of the bonding surface, or flattened to form a splat to be coated, another splat overlaps on each splat, And cooled to form a first sprayed layer 3 and a second sprayed layer 4, respectively.

The first sprayed layer 3 and the second sprayed layer 4 may be a single sprayed layer connected to each other at the start according to the spraying conditions. However, for convenience, the first sprayed layer 3, when formed on the first joined surface 1a, And the second sprayed layer 4 when formed on the second joint surface 2a.

The spray guns forming each sprayed layer may be the same or different, and the bonding materials may be the same or different.

In order to prevent the oxidation of the bonding material during spraying, the thermal spray may be conducted in a vacuum or an inert atmosphere, or an inert gas may be used as the carrier gas.

The connecting step is a step of connecting the first sprayed layer 3 and the second sprayed layer 4 to each other. The first sprayed layer 3 is formed on the joint surface 1a of the first material body and the second sprayed layer 4 is formed on the joint surface 2a of the second material body in the lamination start step, Connect the layers together. (Fig. 1C)

The connection between the two sprayed layers can be connected to each other while connecting the stacks of spatters by continuous spraying. As a result, the first sprayed layer 3 and the second sprayed layer 4 form a single sprayed bonding layer. In this case, the layers are not physically distinguished, but form one layer, the first sprayed layer 3 is bonded to the first material body, and the second sprayed layer 4 is bonded to the second material body And the first sprayed layer 3 and the second sprayed layer 4 are connected by the same spray so that the first material body 1 and the second material body 2 are bonded to each other.

Alternatively, it is not excluded that the sprayed layers formed on the bonding surfaces of the respective material bodies are connected to each other by a known method.

It may further comprise a pressing step after the connecting step or simultaneously with the connecting step (Fig. 1d). The pressing step is a step of sintering the bonded body by applying pressure inward from both the first material body 1 and the second material body 2 after the formation of the thermal spray bonding layer or at the same time to further increase the bonding force between each other.

The method of pressing is not limited, and rolling (roller) can be easily applied. The rolling after the formation of the thermal spray bonding layer, or depending on the material, may be hot rolling or cold rolling.

2 is an explanatory view for explaining in detail the pressing process. According to this, in the embodiment shown in Fig. 2A, the spraying liquid is sprayed between the first material body and the joint surfaces of the first material body and the second material body in the use case, and the first spray layer 3 and the second spray layer 4 are formed and connected to each other, and the first material body 1 and the second material body 2 are pressed and joined by a roller immediately after or simultaneously with the injection.

According to this, the rolling can proceed substantially simultaneously with the formation of the thermal spray bonding layer (5). That is, since the droplet is injected at the point of application of the first material body 1 and the second material body 2 to the rolling roll, the formation and rolling of the thermal spraying layer 5 are performed almost simultaneously .

On the other hand, in the case of spraying the sprayed liquid between the first material body 1 and the second material body 2, the first sprayed layer (the second sprayed material) The second sprayed layer 4 is laminated on the joint surface of the first material layer 3 and the second material body 2 and is connected to each other according to the subsequent spraying (Fig. 2B) And the second sprayed layer 4 may be connected and laminated (FIG. 2C), but the present invention includes all of them.

On the other hand, FIG. 2D is an explanatory view showing that the third material body 2 'is jointed to the first material body 1 and the second material body 2 together.

According to this, one surface of the first material body 1 is bonded to the second material body 2, and the other surface is bonded to the third material body 2 '. The thermal spray bonding layers 5 and 5 'are formed on the respective bonding surfaces to bond the first material body 1, the second material body 2 and the third material body 2' together.

On the other hand, in order to strengthen the bonding force to attach the first sprayed layer 3 and the second sprayed layer 4 to the first material body 1 and the second material body 2, 2 surface of the material body 2, as shown in Fig. 2E is an explanatory view showing a joining method further including a surface modification step.

The surface modification is performed by forming separate spray coating layers 8 and 9 on the joint surfaces of the first material body 1 and the second material body 2 with the use case 7b and 7c before the above-described injection step. The welding material capable of strengthening the bonding is melted and sprayed to form spray coating layers 8 and 9, and the spray coating layers 8 and 9 become the bonding surfaces of the respective materials.

The spray coating layers 8 and 9 may be formed of the same material as that of the sprayed layer to be formed later, or may be formed of other materials.

3 is a cross-sectional view of an embodiment of a bonded body of the material according to the present invention, wherein a bonded body of materials according to another aspect of the present invention comprises a first material body 1, a second material body 2, (5).

The materials of the first material body 1 and the second material body 2 to be bonded are not limited, but usually metals, ceramics, alloys, composites and the like can be bonded. On the other hand, the thermal spray bonding layer 5 is not limited as long as it can be sprayed. Similarly, metals, ceramics, alloys, composites, etc. may be used as the spraying material.

The thermal spray bonding layer 5 includes thermal sprayed faces 3a and 4a on the faces 1a and 2a which are in contact with the first material body 1 and the second material body 2, respectively. The thermal sprayed joint surface is a joint surface generated by colliding droplets with the shapes of the surfaces of the first material body 1 and the second material body 2 and exhibits characteristics of joint surfaces different from ordinary plating or other coating methods.

The thermal spray bonding layer 5 includes a thermal spray layer 3, 4 formed by spraying between the thermal spray bonding face 3a and the thermal spray bonding face 4a. The sprayed layer includes a first sprayed layer 3 of the first material body 1 and a second sprayed layer 4 of the second material body 2. [ It is to be noted that the first sprayed layer 3 and the second sprayed layer 4 are only classified according to their positions and may be substantially the same layer as described above. As described in the above-mentioned manufacturing method, when the spraying method is used to connect the first sprayed layer 3 and the second sprayed layer 4, the sprayed bonding layer 5 has the first sprayed joint surface 3a and the second sprayed layer 4, The first sprayed layer 3 and the second sprayed layer 4 are connected only by the sprayed layers 3 and 4 between the two sprayed surfaces 4a. However, when the first sprayed layer 3 and the second sprayed layer 4 are connected by another method, .

Further, as shown in Fig. 4, when surface modification is performed on the bonding surfaces of the material bodies, additional spray coating layers 8 and 9 may be further provided. For example, when surface modification is performed on both the first material body 1 and the second material body 2, one surface of the spray coating layer 8 is formed on the joint surface 1a of the first material body, The other surface of the coating layer 8 is provided on the sprayed joint surface 3a of the first sprayed layer 3 and one surface of the sprayed coating layer 9 is formed on the joint surface 2a of the second material body 2, The other surface of the spray coating layer 9 is provided on the sprayed joint surface 4a of the second sprayed layer 4. [

At this time, the spray coating layers 8 and 9 included for the surface modification may be differentiated or not distinguished from the first sprayed layer 3 or the second sprayed layer 4 depending on the kind of the material or the spraying method .

As described in the above-described production method, it is possible to carry out the sintering process at the same time as or after formation of the thermal spray bonding layer, while pressing and forming the sprayed layer. In this case, the bonding force is strengthened as the thickness and crystallinity of the joined body of the material change.

According to a preferred embodiment of the present invention, essentially the cylindrical steel tube of the present invention is manufactured using a stainless steel clad steel sheet.

The stainless steel clad steel sheet used in the present invention is a steel sheet which has not been proposed in the past, and preferably a steel sheet formed by the following method can be used.

The present invention relates to a cladding steel sheet having a thin stainless steel sheet joined to a steel sheet as a base material and having a thermal spraying layer comprising stainless steel between the steel sheet and the stainless steel sheet to significantly improve the adhesive strength of the clad sheet, It is possible to use those made of a stainless steel clad sheet which is very useful for various required structures.

According to a preferred embodiment of the present invention, the thermal spray bonding layer and the stainless steel plate include those applied to one side or both sides of the steel plate. Therefore, according to a preferred embodiment of the present invention, the stainless steel clad sheet has a cross-sectional structure of a stainless steel layer / thermal spray bonding layer / steel layer or a stainless steel layer / thermal spray bonding layer / steel layer / spray bonding layer / stainless steel layer Sectional layer structure. Further, such a multilayered structure may be a continuous multilayered structure in which stainless steel is located on the entire outermost surface of one or both sides.

According to a preferred embodiment of the present invention, two stainless steel clad plates having, for example, a stainless steel layer / thermal spray bonding layer / steel layer laminated structure are manufactured, and the steel layers are bonded to each other so as to be adjacent to each other. A stainless steel clad steel sheet having a cross-sectional structure of a thermal sprayed layer / a thermal sprayed layer / a steel layer / a thermal sprayed layer / a steel layer / a thermal sprayed layer / a stainless steel layer may be manufactured and used.

According to a preferred embodiment of the present invention, the steel plate may have a thickness of 1-50 mm, more preferably 1-25 mm.

According to a preferred embodiment of the present invention, the stainless steel plate is made of austenitic stainless steels STS 316 (1371 ° C to 1399 ° C), stainless steel or 303 STS (1399 ° C to 1399 ° C) consisting of 18wt% chromium and 8wt% 1421 DEG C), 304 STS (1399 DEG C to 1454 DEG C), and the like.

According to a preferred embodiment of the present invention, a stainless steel plate having a thickness of 0.3-2 mm can be used.

According to a preferred embodiment of the present invention, the thermal spray bonding layer includes a single thermal spray bonding layer region made of stainless steel and a complex thermal spray bonding layer region made of stainless steel, steel layer or other metal.

According to a preferred embodiment of the present invention, the thermal spray bonding layer includes an area in which a composite thermal spraying layer region composed of a metal different from the thermal spraying layer region exists alternately between the steel sheet and the stainless steel sheet. In addition, the composite spray joint layer region composed of the single spray joint layer region and the other metal may be continuously and regularly arranged, and each of them may have at least two or more regions. That is, the thermal spray bonding layer may be constituted such that at least one region of the two or more combined thermal sprayed bonding layers made of the metal different from the thermal sprayed layer region is present alternately between the steel sheet and the stainless steel sheet. According to the present invention, in the case where the thermal spray bonding layer is formed such that the single thermal spray bonding layer and the complex thermal spray bonding layer region coexist, it is preferable that a single thermal spray bonding layer region is present in the outermost region of both end portions.

5 to 7 show various embodiments of the stainless steel clad sheet according to the present invention and various embodiments of the thermal spray bonding layer structure.

FIG. 2 is an exemplary view showing a structure in which the thermal spraying layer is formed on the steel plate 10 only by a single thermal spray bonding layer 21 in a single region. At this time, it is preferable that the single thermal spray bonding layer 21 is spray bonded with a stainless steel component. The stainless steel plate 30 is rolled on the thermal spraying layer 21.

FIG. 6 shows another embodiment of the stainless steel clad sheet according to the present invention. In the stainless steel clad sheet according to the present invention, the spray bonding layers 21 and 22 formed on the steel plate 10 are divided into a single spray bonding layer 21 region at both ends, (22), and a stainless steel plate (30) is clad-rolled thereon. It is preferable that the single thermal spray bonding layer 21 is made of stainless steel and the composite thermal spray bonding layer 22 is made of one or more components selected from stainless steel, iron, aluminum and nonferrous metals, preferably iron or a mixture of iron and aluminum .

7 shows a state in which the single spray bonding layer 21 region is formed at the both ends of the steel sheet material 10 on which the thermal spray bonding layers 21 and 22 are formed and the single thermal spray bonding layer 21 region and the multi- And the bonding layer 22 regions are alternately formed. The stainless steel plate 30 is clad-rolled on the thermal spray bonding layers 21 and 22. According to the present invention, the stainless steel clad sheet having such a structure can be slit in the direction of the arrows (100, 200) and separated into several steel sheets. In this case, even if the steel sheets are separated by slitting, And a single sprayed bonding layer can always be present in the outermost region where the single sprayed bonding layer is located.

According to a preferred embodiment of the present invention, it is preferable that the thermal spray bonding layer is formed by one more than the area of the combined thermal spray bonding layer in which the single thermal spray bonding layer region is made of another metal. It is preferable that a single coating layer is located in the thermal sprayed layer at both tip portions of the stainless steel clad sheet. This is because when a steel sheet is cut and used by a slitting step of cutting the stainless steel sheet according to the present invention to an arbitrary size or width, a single coating layer is always placed on the cut end of the steel sheet. This is advantageous for bonding.

According to a preferred embodiment of the present invention, it is preferable that the thermal spray bonding layer is formed so that the area of the single thermal spray bonding layer is wide enough to allow the steel sheet to be slitable.

According to a preferred embodiment of the present invention, the single spray bonding layer in the thermal spray bonding layer may be made of stainless steel or stainless steel as a main component, and a mixture of one or more of steel or other metals may be used. The composite spray bonding layer may be made of steel, aluminum, or a mixture thereof. In addition, a single or a mixture of mixed metals and non-ferrous metals applicable to other spray coatings may be used.

According to a preferred embodiment of the present invention, the thickness of the thermal spray bonding layer is preferably from 10 탆 to 500 탆. If the thickness is less than 10 탆 or more than 300 탆, unevenness of the layer thickness may occur and bonding force to the plate material may relatively decrease. More preferably, the thickness is 100 mu m to 300 mu m, which is most advantageous in terms of maximizing the bonding force between the clad-bonded plate materials.

The process of manufacturing the stainless steel clad sheet according to the present invention will be described in detail as an embodiment.

A manufacturing method according to a preferred embodiment of the present invention can be manufactured including a steel plate preparing step, a spray coating step, and a clad rolling brazing step of a stainless steel plate.

As a more specific embodiment, a method of manufacturing a stainless steel clad steel sheet includes the steps of: preparing a steel plate as a base material; A method of manufacturing a steel plate, comprising the steps of: applying a spray coating to a surface of a steel plate using a metal wire including stainless steel; And rolling and brazing the stainless steel plate onto the spray coating surface of the steel plate to perform clad rolling.

According to a preferred embodiment of the present invention, stainless steel clad steel sheet manufacture is carried out through preparation steps for advancing each plate material released from a coil, and a steel plate material subjected to sanding, surface treatment, Preferably, the step may include a step of continuously applying a rolling brazing process such as a step of spraying a metal wire by at least two kinds of materials on the joining surfaces of the plate members, and the like.

According to a preferred embodiment of the present invention, after performing the rolling brazing process, the clad steel sheet may be successively produced through a step of slitting the clad steel sheet to a predetermined width.

According to a preferred embodiment of the present invention, the step may include winding the steel sheet with a coil after performing the process.

According to a preferred embodiment of the present invention, the preheating step, the metal wire arc spray coating, and the rolling step may be further included in the preheating step.

According to a preferred embodiment of the present invention, after the clad steel sheet manufacturing process is performed, the clad steel sheet coil produced in the above process through a separate tube production line is loosened from the coil to prepare a steel pipe, A high frequency preheating step, a high frequency welding step, and a steel pipe cutting step to continuously produce a multi-layered steel pipe having a stainless steel clad cross-sectional structure.

According to a preferred embodiment of the present invention, a high-frequency preheating step may be carried out for favorable joining of the stainless steel clad sheet during the tube making process or various structures. In the high-frequency preheating step, for example, stainless steel (1371-1454 ° C) (1500-1530 ° C), there is a difference in the melting point between the clad steel sheets before and after the high frequency welding to locally heat the welded surfaces, It is possible to carry out the welding with the joint portion of excellent physical properties by having the same point in time at which the molten state is formed. However, the high-frequency welding may be performed directly without performing the high-frequency preheating step depending on the configuration and thickness of the stainless steel clad sheet to be used.

According to a preferred embodiment of the present invention, after performing the above-described process, the cut clad steel pipe is cut in another separate manufacturing line, and a cut surface treatment process is performed as a cut surface finishing process in which both ends of the cut steel pipe are cut from the inside stainless steel to the cut surface The stainless steel clad steel pipe can be preferably used as a clad steel pipe for water supply, industrial use and the like.

Hereinafter, a method of manufacturing a stainless steel clad steel sheet used for manufacturing a stainless steel clad pipe according to the present invention will be described in more detail.

According to a preferred embodiment of the present invention, the step of preparing the steel plate as the base material may further include a sanding process of sanding the surface of the steel plate, and a process of cleaning the surface of the sanded steel plate.

According to a preferred embodiment of the present invention, the sanding process can be performed by striking the surface of the steel plate with the sanding particles to form irregular irregularities on the surface of the steel plate. More specifically, the sanding process is a process of sanding both sides of a steel sheet material having a thickness of, for example, 1 mm to 25 mm or more, and continuously supplying steel sheet materials through a driving roll, for example, , And the upper part of the sanding room has a storage space for storing the sanding particles of brown aluminum oxide (sanding wood) having, for example, the sanding particles of 1000 mu m to 2000 mu m, and the sanding particles stored in the storage space are led down to the lower end of the storage space So that the sanding particles can be dropped. And the duct can serve as a guide tube for minimizing the influence of the wind caused by the rotation of the notary roll installed at the lower end. Since the notary rolls rotate at a high speed, the falling sanding particles are received by the blades of the notary rolls, and the one surface of the steel plate is continuously heated by the rotating force by using the sanding particles while rotating, so that the surface structure of the steel plate is formed into a multi- It can be formed into surface irregularities. At this time, the wings of the notary roll are made with special metal treatment at the end and bent at a certain angle in the opposite direction of rotation instead of the rectangular shape at the center of the notarial roll axis. This is to allow the sanding particles to strike the surface of the steel plate while rotating by receiving particles falling through the channel.

According to a preferred embodiment of the present invention, in order to sandwich both surfaces of the steel plate, an apparatus configured in the same shape may be installed on each surface. In this case, any one apparatus may not be used according to the characteristics of the product.

According to a preferred embodiment of the present invention, when the sanding process is performed using the above-described process and apparatus, the energy consumption is less than that of the sand-pressing process by the air compression injection method, Can be performed.

According to a preferred embodiment of the present invention, the sanding particles may be recycled after the sanding process. More specifically, the recycling system of the sanding particles subjected to the sanding process can be configured to fall and fall into the front and rear spaces through the structural form of the lower end of the sanding room. At this time, as the means for reusing the sanding particles by continuously returning the sanding particles to the upper accommodating space, and the conveying method, a conveying apparatus of the upper and lower conveyor belt type can be used. In addition, the plurality of agglomerated particle conveying members fixed to the belt can be used to return the collected sanding particles. Here, a screw-shaped rotating body for assisting the circulating system of the sanding particles may be laid out to divide the sanding particles into two parts in the front-back direction so as to be in a preferable circulating state. It is also possible to provide a notary device for uniformly dispersing the sanding particles moved to the upper storage space and a lever device for adjusting the sanding particles to fall in proportion to the width of the steel plate to be processed in the falling opening of the sanding storage space . Such a sanding particle recycling system is capable of continuously performing a sanding process on a steel plate.

According to a preferred embodiment of the present invention, the cleaning process for the steel plate having the surface irregularities formed after the sanding process is performed is such that compressed air is sprayed on the surface of the steel, for example, It can be applied as a cleaning method for removing dust and sludge. The compressed air fraction event used in such a purification process may be, for example, at least two pairs of symmetrically arranged pairs of upper and lower portions of the steel plate. In addition, the compressed air blowing event can be applied to the inside of the clean room in contrast to the steel plate which is moved in the continuous movement by being configured to be attached to the fixed table having the adjustable function, The cleaning method as described above allows the symmetrically compressed air fraction events to be angled to either edge of the steel plate so as to be located in the form of facing the nozzles of the fraction event. At this time, the pressure of the compressed air injected in the compressed air blowing event can be preferably 6 kg / cm 2 to 10 kg / cm 2, and the frictional pressure appearing when the compressed air collides with the surface of the steel plate material is transferred to the steel plate, Is lifted while being transported toward one edge of the steel plate. At this time, the cleaned process can be continuously performed by a method in which dust and sludge that have been floated are absorbed and collected by a dust collecting apparatus.

According to a preferred embodiment of the present invention, the steel plate subjected to the cleaning process is arranged in a triangular position so that it can be stably conveyed by the conveyance adjusting means including the three conveyance rolls to which the tension force is applied. The first conveying roll and the second conveying roll in the conveying adjusting means are located below or above the third conveying roll located at the center thereof, and can be used as a facility for conveying the steel plate material uniformly while preventing the left and right warping of the steel plate material. . Preferably, hydraulic cylinders are mounted on both ends of the first and second transport rolls so as to be capable of automatic precision adjustment so as to maintain the hydraulic pressure of 100 kg / cm 2 to 150 kg / cm 2, . According to the present invention, for example, the third conveying roll positioned above the first and second conveying rolls can be moved in the direction of the rotation of the process rolling rolls while the steel plate passing through the second conveying roll passes between the pair of process rolling rolls The third conveying roll may be installed above the first and second conveying rolls so that the tension force of the steel sheet conveyed by the first conveying roll can be maintained. To this end, the position of the third conveying roll may be adjusted so as to maintain the tensing force. . That is, the third conveying roll has a control function of controlling the conveying speed of a certain amount by adjusting the interval between the first and second conveying rolls located at the lower side in the lower portion and using the repulsive force of the steel plate material, And the function of maintaining the tension force of the steel plate material can be continuously performed.

According to a preferred embodiment of the present invention, the steel plate material to be pretreated and transported is subjected to spray coating using a metal wire including stainless steel on its surface.

According to a preferred embodiment of the present invention, in the spray coating process, the joining of the stainless steel sheet to be clad bonded to the progressive base steel sheet is performed in two stages of the brazing rolling rolls (the first rolling roll and the second rolling roll) At this time, the steel plate is transferred by the second rolling roll and the conveying roll of the stainless steel plate in a state where it is opened at a predetermined angle from the portion where the steel plate contacts with the horizontal state, thereby securing a space for performing the thermal spraying At a predetermined position corresponding to a point immediately before lamination or simultaneously with lamination on the steel plate, or both of these methods can be successively carried out in a continuous spray coating. In addition, the method of forming the space may be symmetrically formed on the upper and lower portions of the steel plate, which is transported in the process depending on the type of the product, so that coating and brazing can be simultaneously performed on the upper and lower surfaces of the steel plate.

According to a preferred embodiment of the present invention, at least one or more pairs of coating and rolling brazing process methods are provided at the ends of the pair of first and second rolling rolls by the space securing method for the spray coating process, Layered clad steel sheet.

According to a preferred embodiment of the present invention, the spray coating process is preferably carried out in a coating room by means of a metal wire arc spray coating process. In the spray coating process, it is generally desirable to use two metal wires of the same composition as the coating feedstock. For example, wires wound with two coils have opposite polarity charges, . At this time, when two wires meet at the contact point, the opposite polarity of the wire creates an arc to continuously melt the wire end. Here, the sprayed coating material, which is melted using the gas pressure supplied by supplying the gas and air mixture gas, is applied to the steel plate as the clad base material at a point just before the stainless steel plate is laminated and from the center point where the plate materials are stacked It is possible to uniformly spray a certain amount and a certain portion continuously to perform spray coating.

According to a preferred embodiment of the present invention, the spray coating material in the metal wire arc spray coating step may be stainless steel, steel, aluminum, other mixed metals and non-ferrous metals, for example. That is, a single spray bonding layer can be formed by using stainless steel as a spray coating material. For example, when a single spray bonding layer and a multi-spray bonding layer are alternately spray coated to form a composite spray coating material, Spray coating can be performed by applying aluminum or other mixed metal components. The spray coating material may be prepared and supplied in the form of a wire wound in a circular coil.

According to a preferred embodiment of the present invention, the stainless steel plate continuously running on the steel plate continuously running in the metal wire spray coating step is stacked and stacked at the time when the rolling is started or just before the stacking, Method, and two or more spray coating guns may be installed at each position. Such a spray coating step may be carried out at least once. In the case where the spray coating step is carried out more than once, it may be applied to a case where the spray bonding layer is to be composed of a plurality of single spray bonding layers and one or more composite spray coatings.

The application point of this spray joining process can be applied to a process of spray coating using a spray coating gun at the same time that stainless steel sheets continuously running on a steel sheet continuously running in a metal wire spray coating step are laminated and rolled have. In addition, a step of forming a spray-bonded layer by installing a spray coating gun at a predetermined position at a predetermined point immediately before stacking of a continuously progressing stainless steel plate in a steel plate continuously running in a metal wire spray coating step is performed It is possible. Here, the thermal spray bonding layer means a case including a single thermal spray bonding layer or a composite thermal spray bonding layer.

According to a preferred embodiment of the present invention, this thermal spray coating method may be a method for maintaining the uniformity of the grain size of the thermal spray bonding layer between the steel sheet material and the stainless steel sheet as the clad base material. Preferably, The sprayed coating regions sprayed with the material may be divided into at least one width in the traveling direction of the plate materials so that the sprayed bonding layer regions can be separately coated and coated with at least two or more kinds of materials.

According to the embodiment of the present invention, spray coating may be applied by dissolving metal in addition to arc spray coating using a metal wire. The spray coating in the present invention is meant to include various methods of spray coating, including arc spray coatings using metal wires.

According to the present invention, such a spray coating method can effectively increase the production amount of the clad steel sheet. In addition, it is a remarkably effective method in that a technological alternative necessary for high-frequency welding in which the ends of the tube and the clad steel sheet are joined together in a separate production process using the manufactured clad steel sheet is proposed and a highly effective configuration is provided.

According to a preferred embodiment of the present invention, when a stainless steel plate to be applied to one surface or both surfaces of a clad sheet is a thin plate having a thickness of 0.3 mm to 1 mm or less, even if a clad sheet is manufactured, There is a problem in that it is not possible to jointly bond the both ends of the clad steel sheet together for high frequency welding. Therefore, according to the present invention, a single thermal spray bonding layer region in which a wire arc thermal spray coating is performed on a stainless steel metal in a high frequency welding portion, that is, in a predetermined region of a peripheral portion of the clad steel sheet where high frequency welding is performed is positioned, When spray coating is performed so that the surface of the steel plate in the region other than the adjacent region is sprayed with other metal components such as aluminum or steel alloy so that the area of the composite spraying joint layer is located, at least the tip of the clad steel sheet In addition to the thickness of the stainless steel sheet, the thickness of the thermal sprayed joint layer including stainless steel constituting the single thermal sprayed joint layer is further increased, so that a compensation effect of relatively thickening the thickness of the stainless steel steel sheet due to the same metallic coating of the stainless steel can be obtained All.

Therefore, when a high-frequency welding process or a general argon welding process, which is a core process, is performed by connecting a steel pipe or a clad steel plate using the clad steel sheet to which the thermal spraying method according to the present invention is applied, The weldability is remarkably improved in the production of the welded joint.

In order to effectively manufacture the steel pipe using the manufactured stainless steel clad steel sheet, the steel plate material forming the clad base material and the stainless steel plate material are required to have a single sprayed joint layer region of stainless steel in the direction of continuous movement in order to be clad (See slitting in the direction of arrows 100 and 200 in FIG. 3). [0053] When the clad steel sheet is to be slit in the gauging process using the clad steel sheet, It is preferable to perform spray coating so as to have a single spray bonding layer region at intervals.

Therefore, the high frequency welding part may be made of stainless steel to form a single spray bonding layer and the other part may be spray coated with a different metallic material. To this end, in the present invention, a clad steel sheet is manufactured to have a plurality of repeated single and multiple sprayed joint regions so as to allow a plurality of slits (see FIG. 3), thereby producing a stainless steel clad sheet It is applicable in a very effective way.

According to a preferred embodiment of the present invention, when spray coating is performed at various stages of the metal wire spray coating method, it may be necessary to heat the steel plate and the stainless steel plate to a constant low temperature before spraying in the spray coating room. At this time, if the spray coating room is filled with a certain amount of gas, the supplied steel sheet and stainless steel sheet can be protected from being oxidized due to low temperature heating. Further, in this process, densification of the product makes it possible to further improve the spray coating, and the rolling joint strength between the steel plate and the stainless steel plate can be greatly improved, and the method can be applied to an excellent method for increasing the production amount. According to the present invention, a method of spray coating by applying a low-temperature heating and a predetermined amount of gas is performed, for example, in a case where the spray coating is performed at a predetermined position corresponding to a point of time immediately before the steel sheet material and the stainless steel sheet material are joint- Which is a preferred method.

According to a preferred embodiment of the present invention, in the metal wire thermal spray coating method, at least two incident events are located corresponding to the front and back surfaces of the steel plate, so that the upper surface and the lower surface of the plate can be simultaneously spray- . In addition, the spraying process on either side may not be performed depending on the clad steel sheet and the manufacturing process of the steel pipe.

According to a preferred embodiment of the present invention, in the metal wire spray coating method, a spray material supply roll for advancing two wire spray coating materials made of the same metal in one use case and a means for controlling the main power are set as one set And can be used for spray coating. At this time, for example, the use case is fixed by using a bracket, and a device for adjusting the angle of up, down, left and right is arranged on the bracket, so that the bracket is installed so as to be symmetrical at appropriate positions on both sides of the coating of the steel plate, can do. In addition, spray coating can be performed through reciprocating movement in the direction of both edges of the spray coating surface during the transfer of each plate material. Preferably, however, at least two of the spray coating guns can be configured not to perform such section reciprocating motion.

According to a preferred embodiment of the present invention, in the metal wire spray coating method, the main pressure of the gas supplied to the spray coating gun can be supplied using 6 kg / cm 2 to 10 kg / cm 2. In addition, a mixed gas containing air is introduced into the spray coating room through the opening formed in the lower part of the spray coating room, and the mixed gas is mixed with the main gas, which is the gas injected in the first spraying process, and preheated to 100 ° C. to 450 ° C. or higher, Spraying pressure may be used as the spraying pressure.

The means for supplying the mixed gas to the spray coating gun for the metal wire spray coating includes a main gas control portion, a control portion for sucking a mixed gas containing a part of air in the spray coating chamber and controlling the amount of intake air, A chamber for separating the supplied air and the mixed gas, a device for real-time discharging of the air layer separated and raised in the chamber, a chamber for separating the mixed gas from the chamber, A main control unit for controlling the constant supply amount by feeding the main gas to the main gas and reusing mixed gas and re-mixing the supply amount by the control unit for each gas to preheat the mixed gas supplied from the main control unit A gas supply device for supplying the gas supplied through the preheating part to the spray coating gun and injecting the gas .

According to a preferred embodiment of the present invention, the main gas, which is a gas used for the metal wire spray coating, may be nitrogen, argon or other air mixture gas for the purpose of preventing oxidation of metals, which are various spray coating materials, It is heavier than air and sinks to the bottom of the spray coating room when the wire spray coating is applied. In this case, if the air is sucked in a suction opening at the lower end of the spray coating room and mixed and reused with the main gas, the manufacturing cost of the stainless steel clad sheet can be reduced.

The application process of the gas according to the present invention enables the economical and continuous production in that the gas supplied for the spray coating can be recycled.

According to the present invention, the main purpose of the gas preheating used in the metal wire spray coating step is to keep the arc continuously in accordance with the polarity that two wires meet at the contact when the same two metal wires are supplied to the arc spray coating gun And spraying or spraying the material with the preheated gas when it is generated, accelerating the sprayed material on the surface of the steel plate material to perform an effective coating function. That is, since the gas preheating process is a process in which the spray coating process is basically a process of laminating by plastic deformation of the material, the coating rate of the spray coating material is improved as the toughness of the spray coating material is increased, Process. In particular, as the temperature of the metal increases, the toughness of the conditions for the coating increases, so that by using the preheated gas in the spray coating, a high lamination rate and excellent coating can be obtained.

According to a preferred embodiment of the present invention, the gas may not be preheated in the metal wire spray coating step. This is a method of dissolving and spraying the spray coating material in the spray coating gun when the material of the spray coating material is excellent in the ductility of the material and in the case where the dissolved physical property of the spray coating material is the shortest time in the shortest time, And the case of applying the method of rolling adhesion at the same time as coating is applied, the preheating may not be performed in some cases. For the same reason, only compressed air can be used without using a mixed gas.

According to the present invention, a stainless steel clad sheet can be manufactured through a step of rolling and brazing a stainless steel plate onto a spray coating surface of a steel plate to perform clad joining.

According to a preferred embodiment of the present invention, a stainless steel plate is rolled and brazed on a steel plate, and then a clad steel plate is manufactured. At this time, the steel plate is transferred at the same speed as that of the sprayed steel plate, The supplied stainless steel plate can also be applied by performing the surface treatment similarly to the pretreatment process of the steel plate.

According to a preferred embodiment of the present invention, in the surface treatment step of pretreating a stainless steel plate, a stainless steel plate having a thickness of 0.3 mm to 2 mm, which is one of the base materials of the clad plate, is uncoiled from the coil, The process of entering the plate into the room continuously, the step of flattening the plate, the application of the guide device for maintaining and controlling the predetermined entry speed, the process of cutting and connecting the plate material to the plate material, and the process of argon welding .

According to a preferred embodiment of the present invention, a driving roll that performs a process for entering a stainless steel plate entering a surface treatment process into a surface treatment room, includes a roll shaft made of steel that is wider than the maximum width of the entering stainless steel plate . It is possible to arrange such a plurality of iron plates in the form of flanges in such a manner that they can be fitted to the width of the plate material and the width thereof can be adjusted and fixed. The roll shaft of the drive roll may be configured to perform a function of receiving the pressing force of the upper portion generated by the driving of the supply roll on the lower surface and the pressing of the air compression cylinder. ) Wheels (ø350 ~ ø500) can be used in the form of multiple layers in the form of flanges, which are fixed to the width of the stainless steel plate and fixed. The wheels of the fixed feed roll are equipped with rotating rolls, And feed it. The surface to be bonded to the steel plate, which is one side of the supplied stainless steel plate, can be machined by applying a certain pressure through the air compression cylinder which is assembled symmetrically to the surface of the stainless steel plate by the articulated link method. Through this process, surface roughness (30 μm to 200 μm) can be successively performed on the entire surface of one side of the stainless steel plate. According to the present invention, when a pea wheel is abraded by a certain amount during the continuous operation, the central points of the upper and lower drive rolls and the supply rolls can be varied. At this time, the entire constituent of the supply roll rises and the function of continuously replenishing the section by the amount of wear and the direction in which the plate material advances, that is, the entire constituent of the supply roll is repeatedly moved in a certain section in the vertical direction, And to maintain the wear of the wheel constant. According to the present invention, the surface treatment process of the stainless steel plate can be continuously performed while collecting the dust and sludge generated in the course of such a process by the dust collecting apparatus.

According to a preferred embodiment of the present invention, a cleaning process can be performed after the surface treatment of the stainless steel plate. Such a cleaning process can be performed in a manner similar to the cleaning process of the steel plate, and the purifying purpose and function are the same.

According to a preferred embodiment of the present invention, there is provided an apparatus for adjusting a tension force of a stainless steel plate and a constant conveying speed of the plate during the feeding and feeding of the stainless steel plate, So that the feeding and feeding can be performed in the same manner.

According to the present invention, the pretreatment process of this stainless steel plate and the supply process of maintaining the tension force are all performed in a process before being supplied to the spray coating surface of the steel plate for rolling.

According to a preferred embodiment of the present invention, in the step of rolling and brazing a stainless steel plate on a spray coating surface of a steel plate to perform clad joining, the rolling process is a rolling process in which a continuously sprayed coated steel plate and a surface- And then joining them. At this time, the rolling stock amount is preferably from 50 kg / cm 2 to 200 kg / cm 2, and may vary depending on the characteristics and thickness of the two sheets to be rolled.

According to a preferred embodiment of the present invention, in the spray coating process, coating failure may occur due to the acceleration of the rolling roll when the metal wire spray coating is applied to both ends of the steel sheet material. Therefore, in order to prevent this, Thereby performing clad rolling.

According to a preferred embodiment of the present invention, either the cold rolling process or the hot rolling process may be selected as the rolling process. This can be related to the material and production of the clad base materials, steel plate and stainless steel plate. For example, depending on the material of the clad sheet material, the hot rolling process can be performed to increase the quality and the production amount. That is, the plate material of the clad base materials can be pre-heated to 100 ° C to 300 ° C, spray coated and rolled.

According to the present invention, since the spray coating method employs a method of dissolving and spraying metal wires, it can be applied to both hot rolling and cold rolling between two plates around the spray coating surface. However, in cold rolling, the cold rolled steel can not be preheated because the plate of the clad base material is not preheated. These two rolling brazing methods can be applied to any metal and form in the present invention, which is a breakthrough method compared to other methods that have been invented so far.

According to a preferred embodiment of the present invention, when the rolling process is performed, the heat generated in the wire spray coating may be transferred to the rolling roll through the clad sheet to maintain a heating temperature state in which the heat is continuously accumulated. In order to solve this problem, it is more preferable to carry out cooling by applying cooling water or cooling oil to the rolling roll.

According to a preferred embodiment of the present invention, when the rolling process is carried out, when the wire spray coating is carried out at both ends of the steel plate, that is, at the edge of the rolling roll, The area can be spray coated. In order to prevent this, a metal or plastic film or the like in the form of a film may be mounted on a rolling roll, and the film used herein may be applied to a rolling roll in the form of a belt so as to be in contact with the clad plate at the upper and lower ends of a pair of rolling rolls And is wound around the auxiliary shaft wound around the rolling roll at the same rotational speed as the rolling roll. The apparatus for driving such a film is structured such that the film roll is sandwiched and fixed to the auxiliary shaft, and the auxiliary shafts are controlled to rotate in the same direction according to the rotation speed of the rolling roll and to have a function of being reduced and expanded according to the width of the clad sheet A pair of upper and lower auxiliary shafts may be configured to perform the function simultaneously with rolling.

According to the present invention, a stainless steel clad steel sheet is manufactured through the above-described process, and a cylindrical steel pipe can be manufactured using the stainless steel clad steel sheet.

The present invention may further include a step of slitting the stainless steel clad sheet to produce a predetermined size by slitting along the center of the single sprayed coating surface of the sprayed coating surface.

According to a preferred embodiment of the present invention, it is more preferable to manufacture a steel pipe having a desired standard through such a slitting process, and then to manufacture a cylindrical steel pipe.

According to a preferred embodiment of the present invention, the slitting process is a process of slitting the continuous clad steel sheet after the rolling process is performed to a predetermined width standard. Such a slitting process can be performed by the steps of preparing the clad steel sheet, the tension roll, the rolling roll, and the apparatus for winding the clad steel sheet as the last process. In the case where the clad steel sheet having a constant tension is moved horizontally, A slitting blade (knife) is prepared in an upper roll and a lower roll in a state in which 1 set of horizontal rolls and 1 set of upper and lower horizontal rolls are prepared, and the clad plate is continuously moved by the combined device so that the slitting process can be continuously performed .

According to a preferred embodiment of the present invention, in the slitting step, the functional configuration of each axis of the upper and lower slits is connected to a speed reducer provided with a rotational power, and a flange-shaped blade (knife) It can be carried out by engaging with each other in a proportional correspondence to fit the production specification appropriate to the cutting size and assembling. At this time, in order to prevent twisting or kinking of the clad steel sheet, a certain flange type rubber or the like is used to reinforce and deflect the uncut portion, and the slitting process can be continuously performed and rewound and commercialized.

According to the present invention, it is possible to produce a stainless steel clad steel pipe with excellent physical properties such as corrosion resistance by using the stainless steel clad steel sheet thus prepared.

That is, the present invention includes a step of metal-rolling and brazing a stainless steel sheet material to the surface of a steel sheet material to prepare a clad-rolled stainless steel clad sheet.

According to a preferred embodiment of the present invention, the step of winding the stainless steel clad sheet manufactured in the final stage of the clad sheet manufacturing process with a coil, the step of unwinding the clad sheet wound in the coil form, The steel plate which has been flattened can be introduced into the tube making machine through the auxiliary guide roll installed at the beginning of the tube making machine.

The present invention also includes a step of forming the cylindrical stainless steel clad sheet by forming the cylindrical steel tube using the tube making apparatus and forming the cylindrical open tube so that both ends thereof abut.

According to a preferred embodiment of the present invention, the steel sheet entering the tubular pipe forming apparatus for forming the cylindrical open pipe includes a plurality of step-forming rolls having a step-forming roll, a reduction gear, And can be formed into a cylindrical shape before the high-frequency welding.

According to the present invention, in a gas room having a rectangular shape of a semi-hermetically closed shape having a predetermined section on the upper surface of the tube making apparatus, the untreated cylindrical steel pipe which has been passed through the shear opening is subjected to a high- The welded cylindrical steel pipe can be manufactured as a cylindrical steel pipe while continuing the high frequency welding through the gas room rear room opening. In the cylindrical steel pipe produced by the high frequency welding, the rolling progresses at the inner and outer projecting portions generated during the high frequency welding by the rolling device including the rolling roll at a position of a certain distance from the high frequency welding portion. In addition, the continuously manufactured cylindrical pipe may be further roughened by a step of adjusting the pipe to a rounded shape. In the steel pipe adjusting step, the steel sheet may be further cooled by passing through a roll of a forming step, and then cut by a cutting machine to a predetermined size.

According to the present invention, the manufacturing process of such a stainless steel clad pipe can be carried out in a continuous process.

According to the present invention, after the cylindrical open pipe is formed as described above, the welds at both ends of the cylindrical open pipe may be preheated locally at a high frequency before the high frequency welding.

According to a preferred embodiment of the present invention, the preheating in the high frequency preheating step can be performed at 300 ° C to 900 ° C, and the high frequency preheating step is performed before the both ends of the cylindrical open tube manufactured using the clad steel plate are welded Is a process immediately before joining to a complete cylindrical steel pipe. When a continuous process is performed while passing a gas pipe through a gas pipe and forming a cylindrical open pipe, the amount of the cylindrical open pipe And a step of preheating a welded portion where the tip ends are connected to each other.

According to a preferred embodiment of the present invention, the high-frequency preheating step includes, for example, a high-frequency generator for controlling the applied power to generate high frequency electric power, a coil for heating both ends of the cylindrical open tube to be heated, A high-frequency preheating device, such as a cooling device, which performs heating and cooling.

According to a preferred embodiment of the present invention, in the high frequency preheating step, a high-frequency heating coil is used, but a step of installing and preheating a coil, which is formed in contrast to a contact portion of the butt end of the cylindrical open tube, . In case of preheating at a high heating temperature, a method of preventing oxidation is provided so as not to interfere with the welding by spraying the preheating part of the cylindrical open pipe at the heating part and the rear part thereof or both parts thereof Gas injection can be applied. However, if preheating at low heating temperatures, this gas injection may not be applied.

According to a preferred embodiment of the present invention, the high-frequency preheating step is a step that can be additionally performed as a method for advancing high-frequency welding to a superior stage of high-frequency welding.

According to the present invention, the stainless steel clad sheet used for manufacturing the cylindrical steel tube and the metal constituting the steel sheet are clad with stainless steel having a welding melting point of 1420 to 1450 DEG C inside and outside, for example, Since the intermediate layer is composed of a bonding layer of a heterogeneous material in which steel having a welding melting point of 1450 ° C to 1550 ° C is located, there is a difference in welding melting point according to each metal material when such a heterogeneous metal material is simultaneously subjected to high frequency welding. In the present invention, the heterogeneous metal having such characteristics is locally preheated by using a high frequency preheating apparatus including a coil, so that the welding melting point is made to be at the same time point between the clodially dissimilar metals in the subsequent high frequency welding step, It is a method that can increase the production volume remarkably by making the liver melt firing excellent.

In the present invention, the steel sheet used for manufacturing the stainless steel clad steel tube is made of stainless steel (0.3 mm to 2 mm) on the inner side and steel (2.3 mm to 25 mm) on the intermediate layer, In addition, when the bonding layer coated with stainless steel (0.5 mm ~ 2 mm) is multilayered or the intermediate layer steel is thicker at the outer side, the difference in welding melting point during high frequency welding is large, so that the tip of the cylindrical open tube is welded It is difficult. In the present invention, a clad steel pipe having such a heterogeneous multi-layered metal and multiple layers is locally preheated by using a high-frequency preheating apparatus including a coil, and the welding melting point is the same among the clad- And it is a method that can remarkably increase the production amount by making the melting and calcining between each metal at the time of welding excellent. However, according to a preferred embodiment of the present invention, high-frequency preheating may not be applied when the size of the clad steel pipe is relatively small, from ø27.2 to ø76.3, and the thickness of the steel plate as the intermediate layer is within 2 mm to 5 mm.

According to a preferred embodiment of the present invention, the clad steel pipe material of the present invention is made of stainless steel (0.3 mm to 1 mm) on the inner side and a bonding layer coated on the outer side thereof with steel or the like, Frequency preheating may not be used when the outer metal layer of the clad steel pipe is a magnetic substance or when the thickness of the outer metal layer clad stainless steel is 5 mm or less.

The present invention is a step of forming a steel pipe by welding a welded portion at both ends of a preheated or unheated open pipe by high frequency welding.

According to a preferred embodiment of the present invention, in the high-frequency welding step, the principle described in the high-frequency principle and the heating principle proposed in the high-frequency preheating method using coils are intensively induced to the welded portion of the clad steel pipe, That is, by reaching the welding melting point and welding. Further, in the high frequency welding step of the present invention, a gas injection device for preventing oxidation at the welding and a rolling device including a rolling roll for rolling the welding part protruding inward and outward at the time of welding are connected to each other, A rolling roll may be constructed so as to be compared with the inside and outside of the steel pipe of the steel pipe and subjected to the rolling step.

According to a preferred embodiment of the present invention, in the high-frequency welding step, a ferrite core is formed of a conductive sintered metal which can be intensively induction-heated in a welded portion of a cylindrical open pipe, In this case, a plurality of rubber packings are used in the form of interposing a circular-shaped epoxy insulation on the outer side of the ferrite core. The inner and outer sides of the ferrite core are formed into a sealable structure, The ferrite core device may be inserted into a cylindrical steel pipe to be welded to a certain region of the high frequency welding portion of the clad steel plate, and then high frequency welding may be continuously performed. Thus, stainless steel having excellent corrosion resistance It is possible to continuously produce a clad steel pipe. At this time, the cooling means for cooling the heat generated in the ferrite core can be constituted by circulating the cooling water.

According to a preferred embodiment of the present invention, the anti-oxidation process may be further applied in the high-frequency welding step. In the anti-oxidation method of the present invention, the melting points of the metal materials to be welded in the high-frequency welding step for manufacturing the stainless steel clad cylindrical pipe are inner stainless steel (1420 ° C. to 1450 ° C.) and interlayer steel (1450 ° C. to 1550 ° C. ) And outer stainless steel (1420 ° C ~ 1450 ° C) are different from each other, so that these metals are prevented from being oxidized by reacting with air during welding, thereby enabling smooth welding. In this antioxidative method, a semi-hermetic gas chamber is formed of nitrogen, argon and other mixed gases, and a high frequency welding point is applied in the gas room. At least two gas injection holes formed at the rear end of the ferrite core- The gas injection port is used to spray the gas continuously from the inside of the cylindrical steel pipe to the upper side in the direction of the welded part during welding, and can be sprayed at about 2 kg / cm 2 to 10 kg / cm 2. At this time, the injected gas spreads evenly over the welded portion, thereby preventing oxidation. And the remaining amount of gas can spread out to the left and right sides of the inner welding portion of the cylindrical steel pipe, and can escape from the gas room. In addition, a nipple is connected to the shear non-magnetic metal of the ferrite core to supply a certain amount of gas to the device for preventing oxidation, and the nipple is connected to the ferrite core through a metal pipe having a channel formed at the center of the ferrite core It is possible to continuously perform the function of supplying the gas to the gas injection port located at the rear end of the ferrite core and injecting the gas.

According to a preferred embodiment of the present invention, in the high frequency welding step, in order to prevent oxidation of the outside of the stainless steel clad cylindrical pipe, the oxidation prevention method may include at least two jet openings, It is recommended that the end of the weld be fixed to a certain part of the gas room, and nitrogen, argon or other mixed gas should be supplied to the gas supply pipe nipple connected to the fixed part, Lt; 2 > to 10 kg / cm < 2 >. At this time, the injected gas spreads evenly, thereby preventing oxidation. During this gas injection process, some gases can escape to the outside. According to the present invention, this antioxidation method contributes to the continuous production of stainless steel cladded cylindrical steel pipes excellent in corrosion resistance.

As described above, according to the preferred method of the present invention, in the high-frequency welding step, at least two gas injection openings are provided on both inner and outer portions of the welded portion of the cylindrical open end of the pipe for welding, It is possible to further include the application of gas spraying as a method for excellent weldability between metals, that is, oxidation prevention during firing.

In the present invention, after the welding is completed, the welded portion welded by the high-frequency welding is rolled, and the welding protrusion is rolled so as to be flush with the inner and outer surfaces of the steel pipe.

According to a preferred embodiment of the present invention, when the high frequency welding is continuously performed in the high frequency welding step, the weld bead portion inside and outside the cylindrical steel pipe, that is, the portion protruded by welding is welded to the other surface , The roller unit located inside the steel pipe and the rolling roll located in correspondence with the outside of the steel pipe are used to roll the projections protruding inward and outward and to continuously perform molding in the same manner as the inner and outer surfaces can do.

According to a preferred embodiment of the present invention, the welded cylindrical steel pipe is, for example, a steel pipe in which a stainless steel plate is clad-coated and adhered to the inner side, the outer side or the inner and outer side, The part protruding from the part where it is made is stainless steel. Therefore, it is not possible to cut the stainless steel material of the protruded portion by any other method, so that it is preferable to perform the rolling in the same manner as described above.

According to a preferred embodiment of the present invention, in the rolling process after the high-frequency welding, the gas injection hole fixed to the rear end portion of the ferrite core formed on the outer side of the cylindrical steel pipe and the inner roll structure located inside the steel pipe are assembled together The steel pipe rolling apparatus having such a configuration can be used for rolling treatment. According to an embodiment of the present invention, the inner roll structure is formed by integrally fastening a roll to a bent rod with a pin, and is assembled with a second pin to the inner roll structure frame by the rotation function of the roll, And the small roll may be arranged so as to be capable of rolling on the weld projection in a shape comparable to the inner side upper cylindrical surface of the steel pipe. In this case, fine adjustment of the fine adjustment screw located on the upper side of the bent rod end including the small roll to the fine direction adjusts the link action of the fixed rod including the small roll, that is, the force of the lever, It can be operated to have a constant pressing force against the projection. In addition, the lower small rolls are arranged symmetrically with the upper small rolls, and have the same cross-sectional area as the cylindrical surface in the inside of the steel pipe and have a cross-sectional area larger than that of the upper small rolls. As shown in FIG. The upper and lower small rolls in the steel pipe can be rolled together with two upper and lower rolling rolls provided corresponding to the vertical line on the outer side of the steel pipe to perform the rolling process with the function of forcibly pressing the upper surface of the welded portion of the cylindrical steel pipe. In addition, an induction roll, which prevents the inside small-sized roll structural body from being warped rightward and leftward in the inside of the steel pipe, is additionally laid horizontally in the horizontal state of the steel pipe so that the inside upper and lower small rolls can stably perform rolling on the welding protrusions continuously Lt; / RTI >

According to a preferred embodiment of the present invention, in the high-frequency welding post-rolling process, rolling is performed by a small roll and rolling rolls installed inside and outside the welded cylindrical steel pipe. In this case, when the high-frequency welding is continuously performed, the molten bead protruding surface of the welded portion generated at the inside and outside of the steel pipe is driven by a pressing force function which pushes out the rolling force to the outside of the steel pipe by using a small roll, An external rolling roll positioned outside the small roll is subjected to rolling by applying a rolling force in an inner direction of the steel pipe to perform a rolling process so that the welded portion protruding inward and outward of the cylindrical steel pipe is flush with the other surface Process can be performed. At this time, the weld bead protrusion formed on the inner and outer sides of the clad cylindrical steel pipe may have a very fine air layer at the firing portion thereof. However, in the rolling process as described above, rolling is performed at 500 to 800 ° C A cylindrical steel tube cladded with a corrosion resistant stainless steel can be continuously manufactured while rolling is performed so as to have an excellent weld joint fibrillating force at the welded bead surface.

According to a preferred embodiment of the present invention, in order to calibrate a deformed portion, which may occur in a rolling process or the like, on a cylindrical steel pipe manufactured through the rolling process as described above, In the step of adjusting the steel pipe, it is cooled by passing through a roll of a molding step, and thereafter, a process of cutting a predetermined standard and length can be further continuously performed.

According to a preferred embodiment of the present invention, the manufactured cylindrical steel pipe is cut and then further processed in a separate process line to cut both sides of the cylindrical steel pipe with the clad of stainless steel, and the stainless steel layer is cut from the inner side stainless steel A cylindrical steel pipe having a completely corrosion-resistant function can be finally manufactured by proceeding the step of finishing the cut surface of the steel pipe.

According to a preferred embodiment of the present invention, in the finishing process for the cut surface, a jig device for fixing the steel pipe to the clamp function for fixing the steel pipe cut at both sides can be used. According to the embodiment of the present invention, the jig device can be constructed in such a manner that the clamps are opened and closed, and the steel pipe can be coupled and fixed to a certain position by a single structure including a hydraulic cylinder having front and rear transfer guides. Further, by using a device for cutting a steel pipe fixed to a jig device, the cutting device is positioned symmetrically in front of the cutting surface of the steel pipe, and at least two cutting tools are formed in the form of a circular wheel and connected to a rotary motor Can be assembled.

8 is a diagram illustrating a method of applying a cutting device 300 to a front end of a steel pipe 500 according to the present invention. As shown in FIG. 8, the cutting device 300 may include a hydraulic cylinder 310 having a precise moving guide function that moves forward and backward at the time of cutting. At this time, the cutting device 300 may be rotated so as to cut and cut the cut surface of the fixed steel pipe 500 into a certain shape so as to cut the inner-layer stainless steel 31 and the steel 10 while leaving a certain thickness or width of the steel 10 .

9 is a view showing a partially cut steel pipe structure (a) and a steel pipe cross-sectional shape (b) before cutting according to the steel pipe 500 manufactured as described above.

Fig. 10 is a view showing a structure in which the tip of the steel pipe 500 is cut, showing the partially cut three-dimensional structure (a) and the cross-sectional shape (b) of the steel pipe front end before the finishing process.

After the partial cutting of the steel pipe end is completed as described above, the clamping type jig device which moves backward and simultaneously fixes the steel pipe is advanced by the hydraulic cylinder, and the steel pipe is fixed at a predetermined position symmetrical to the front surface of the cutting device 300 500 can be positioned on the same line as the center of the mold in the mold bending apparatus 400 having the hydraulic pressure cylinder 410 and the mold 420, for example. The bending device 400 having the mold advances due to the start of the hydraulic pressurizing cylinder 410 so that a certain portion of the entire surface of the mold 420 enters the inside of the steel pipe 500, The inner stainless steel 31 of the steel pipe is bent, and the end face of the steel pipe is connected to the end of the outer stainless steel 30 and is wrapped. Thus, the finishing process can be completed through the step of bending the metal mold.

According to a preferred embodiment of the present invention, the relatively small-sized steel pipe having a steel pipe diameter of about 25-150 mm in the finishing process can complete the finishing process by the metal bending method. However, in the case of a large steel pipe having a steel pipe diameter of 150 mm or more, In the case of such a large steel pipe, for example, the metal mold 420 combined with the hydraulic pressurizing cylinder 410 is disassembled, and the steel pipe bending molding combined with a rotary rotary type combined with the rotary power is used. It is possible to apply bending molding to the large steel pipe as a finishing process for a steel pipe having the same shape as that of the mold bending method by advancing the pressure of the pressurizing cylinder 410.

And the step of argon welding the front end of the bent end of the clad steel pipe at the outer end portion of the end portion where the stainless steel 31 and the outer stainless steel 30 are joined together.

The thus finished steel pipe has the structure as shown in Fig.

Fig. 11 is a view showing the partially cut-out three-dimensional structure (a) and the cross-sectional shape (b) of the steel pipe front end after the finishing process of the front end of the steel pipe. Here, the inner layer stainless steel (31) plate is welded at the front end of the steel pipe (500) so as to surround the outer stainless steel (30), so that the steel plate material (10) inside the steel pipe So that corrosion does not occur.

According to the present invention, the above-described finishing process can be repeated continuously. Preferably, the finishing process is performed using the two bending devices 400 disposed on the right and left cut surfaces of the steel pipe, The clad cylindrical steel pipe can be continuously produced.

12 is a diagram schematically illustrating a manufacturing process of a stainless steel clad cylindrical steel pipe according to a preferred embodiment of the present invention.

The process indicated by the dashed line in Fig. 12 means a process that may or may not be performed, or a process that can be performed additionally.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10 - Steel plate
21 - single spray joint layer
22 - Composite spray joint layer
30, 31-Stainless steel plate
100, 200 - Slitting cutting direction
300 - Cutting device
310 - Hydraulic cylinder
400 - Bending device
410 - Hydraulic pressurized cylinder
420 - Mold

Claims (37)

As a method of joining the first material body and the second material body,
A spraying step of spraying a droplet of molten bonding material onto a first bonding surface of the first material body and a second bonding surface of the second material body; And
A lamination starting step of forming a sprayed layer on the bonding surfaces by laminating splats generated by collision of droplets on the first bonding surface and the second bonding surface; And
And a connecting step of connecting the sprayed layers to each other after or simultaneously with the start of the lamination step. The method according to claim 1,
Wherein the splicing of the sprayed layers in the splicing step comprises laminating spatters by collision of droplets. 3. The method of claim 2,
Wherein the joining of the sprayed layers in the joining step is performed by continuing the lamination started in the laminating start step until the sprayed layers are connected. The method according to claim 1,
And a pressing step of bringing the first material body and the second material body into close contact with each other after the connecting step. The method according to claim 1,
Wherein the injection is performed in a vacuum or an inert atmosphere or in an inert gas blowing state in the injection step. The method according to claim 1,
Wherein the surface modification is performed on a surface to be a bonding surface of the first material body and the second material body before the injection step. The method according to claim 6,
Wherein the surface modification is performed by spraying a droplet of the molten coating material onto at least one of a first joint surface of the first material body and a second joint surface of the second material body to form a spray coating layer on the surface Bonding method. A first material body;
A second material body; And
And a thermal spraying bonding layer provided between the first material body and the second material body,
Wherein the thermal spraying layer
A joined body of a material comprising a laminate of splats generated by collision of droplets of molten bonding material and having a thermal spraying interface on both the first material body and the second material body. 9. The method of claim 8,
Wherein the first material body, the second material body, and the spray bonding layer are materials selected from the group consisting of metals, ceramics, alloys, and composite materials. 9. The method of claim 8,
Wherein the thermal spraying layer
A first spray joint surface provided on a joint surface with the first material body;
A second sprayed joint surface provided on a joint surface with the second material body;
A first sprayed layer laminated on the first sprayed joint surface; And
And a second sprayed layer laminated on the second sprayed joint surface. 10. The method of claim 9,
Wherein the first sprayed layer and the second sprayed layer are connected to each other. 10. The method of claim 9,
Wherein a separate connecting layer is further provided between the first sprayed layer and the second sprayed layer. 10. The method of claim 9,
And a spray coating layer is further provided on at least one surface between the thermal spray bonding layers and the material bodies. 14. The method according to any one of claims 8 to 13,
Wherein the joined body of the material is pressed and plastically deformed. A plate-like member in which a second tube is clad on a surface of a first plate,
And a thermal spray bonding layer provided between the first plate and the second plate,
Wherein the thermal spraying layer
A cladding plate comprising a laminate of splats generated by collision of droplets of molten bonding material, and having sprayed joint surfaces on both of the joining surfaces of the first and second plates. A steel pipe with a second tube clad on the surface of the first tube,
And a thermal spray bonding layer provided between the first tube and the second tube,
Wherein the thermal spraying layer
A cladding tube comprising a laminate of splats generated by collision of droplets of molten bonding material, and having sprayed joint surfaces on both the first tube and the second tubes. 18. The method of claim 16,
In the cladding tube,
A stainless steel clad cylinder having a cross section structure of stainless steel / spray coating layer / steel layer / spray coating layer / stainless steel or stainless steel / spray coating layer / steel layer / spray coating layer / steel layer / spray coating layer / stainless steel Steel pipes. The cylindrical steel pipe according to claim 15, wherein the inner side surface, the outer side surface, or the inner and outer side surfaces of the steel pipe are clad in stainless steel. 16. The stainless steel clad tube as claimed in claim 15, wherein both end cut surfaces of the steel pipe are finished so that the inner side stainless steel plate extends to the outer side stainless steel plate and completely encloses the both end cut surfaces. The cylindrical steel pipe according to claim 17, wherein the stainless steel sheet has a thickness of 0.3-2 mm. 17. The stainless steel clad tube according to claim 16, wherein the spray coating layer comprises a single spray coating layer region made of stainless steel and a composite spray coating layer region made of another metal. The stainless steel cladding cylindrical steel pipe according to claim 20, wherein the composite spray coating layer is made of stainless steel, steel, aluminum or a mixture thereof. [Claim 16] The cylindrical steel pipe of claim 16, wherein the metal spray coating layer has a thickness of 10 to 500 mu m. Preparing a clad stainless steel clad steel sheet by metal-spraying a stainless steel sheet on the surface of a steel sheet, followed by rolling and brazing;
Continuously forming an open tube in a cylindrical shape so that both ends of the stainless steel clad steel sheet are in contact with each other while forming the stainless steel clad sheet in a cylindrical tube shape;
Forming a steel pipe by continuously welding the welded portion of the open pipe by high frequency welding; And
Rolling the welded portion welded by high-frequency welding and continuously rolling the welded projections so as to be flush with the inner and outer surfaces of the steel pipe;
Wherein the stainless steel is clad. The method as claimed in claim 24, wherein the step of preparing a clad stainless steel clad sheet by rolling-brazing a stainless steel sheet material by metal spray coating on the surface of the steel sheet material,
Preparing a steel plate as a base material;
Preparing a stainless steel plate;
A method of manufacturing a steel plate, comprising the steps of: applying a spray coating to a surface of a steel plate using a metal wire including stainless steel; And
Rolling and brazing a stainless steel plate onto a sprayed coating surface of a steel plate to perform clad rolling;
Wherein the stainless steel is clad. The continuous manufacturing method of a stainless steel clad tube according to claim 25, comprising a sanding step of sanding the surface of the steel plate in the step of preparing the steel plate, and a cleaning step of cleaning the surface of the sanded steel plate. The method of manufacturing a stainless steel clad tube according to claim 24, wherein a high-frequency preheating step is additionally performed on the welded portion of the open pipe before the step of forming the steel pipe by high frequency welding the welded portion of the open pipe. [27] The high-frequency preheating step may be performed by continuously using a high-frequency heating coil, and preheating the coil by providing a coil formed in a portion of the tip end of the cylindrical open tube, Clamped cylindrical steel pipe manufacturing method. 27. The method of claim 27, wherein the high frequency preheating step comprises providing a gas fraction event at the heating section for preheating and at the back end thereof, or both, to spray the precursor at the tip of the cylindrical open tube to prevent oxidation The method of manufacturing a cylindrical stainless steel clad tube according to claim 1, further comprising applying a gas spraying method. [24] The method according to claim 24, wherein at least two gas injection orifices are provided at both the inner and outer portions of the steel pipe at the welded portion of the cylindrical open end for welding in the step of forming the steel pipe by high frequency welding, Wherein the stainless steel is clad. [24] The method of claim 24, wherein in the step of rolling the high frequency welding portion, rolling is performed by a small roll and rolling rolls installed on the inside and outside of the welded cylindrical steel pipe, An outer rolling roll which is driven by a pressing force function to push out the steel pipe by a rolling force by using a small roll on the inner side of the steel pipe and an outer rolling roll which is located in correspondence with the small roll on the outer side of the steel pipe applies a rolling force to the inner side of the steel pipe, Wherein the step of rolling the stainless steel cladding comprises a step of rolling the steel through the driving. The manufacturing method of a stainless steel clad tube according to claim 24, further comprising a step of calibrating the cylinder to a true circular shape in order to calibrate the deformed portion of the cylindrical steel tube manufactured after the rolling step Way. The method of manufacturing a stainless steel clad tube according to claim 24, further comprising a step of cutting the manufactured cylindrical steel pipe to a predetermined size and length. 34. The method according to claim 33, wherein the cut surface of the cylindrical steel tube is formed by machining both cut surfaces of the cylindrical steel tube clad with stainless steel and bending and wrapping to the stainless steel outside the steel tube using a stainless steel layer as an inner layer of the cut surface, And a finishing process is further performed on the stainless steel clad. 35. The method according to claim 34, wherein the cut surface of the cylindrical steel tube is machined using a cutting apparatus that cuts a fixed steel pipe, the cutting apparatus including a hydraulic cylinder having a precision movement guide function that moves forward and backward at the cutting end, And cutting the cut surface of the fixed steel pipe into a predetermined shape so as to be cut while leaving only a predetermined amount of the inner-layer stainless steel and the parent steel. 35. The method according to claim 34, wherein the step of finishing the cut surface of the cylindrical steel pipe uses a bending device having a hydraulic pressurizing cylinder and a mold, wherein the bending device advances due to the start of the hydraulic pressurizing cylinder, And performing a mold bending process by simultaneously bending the inner stainless steel of the steel pipe by a predetermined shape of the mold and by wrapping the end face of the steel pipe to the end of the outer stainless steel and wrapping the same. ≪ / RTI > The bending apparatus according to claim 21, wherein the cutting step of the cylindrical steel pipe is performed by using a hydraulic pressurizing cylinder and a bending apparatus having two or more roller apparatuses in contrast to a steel pipe bending apparatus combined with a rotary rotary apparatus having rotary power, And a step of bending the steel pipe by advancing by the actuation of the pressurizing cylinder so that the inner stainless steel of the steel pipe is bent and the end face of the steel pipe is connected to the end of the outer stainless steel to be wrapped around the steel pipe. ≪ / RTI >

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