KR20160036472A - Stainless steel clad sheet and a method of manufacturing the same - Google Patents

Abstract

The present invention relates to a stainless steel clad sheet and a method for manufacturing the same. According to the present invention, a stainless steel clad sheet is formed as a sprayed coating layer is formed on a steel sheet, and a stainless steel sheet is clad thereon. According to the present invention, provided are the stainless steel clad sheet and a method for manufacturing the same, wherein a binding force, corrosion resistance, wear resistance, durability, or the like of the stainless steel clad sheet is superior to that of a conventional steel sheet, a galvanized steel sheet, or the like.

Description

[0001] Stainless steel clad sheet and manufacturing method thereof [0002]

The present invention relates to a stainless steel clad steel sheet and a method of manufacturing the same. More particularly, the present invention relates to a stainless steel clad sheet which is formed by forming a spray coating layer on a steel sheet material and cladding a stainless steel sheet thereon, , Corrosion resistance, abrasion resistance, durability and the like, and a method for producing the same.

Steel structures, especially steel for piping, have a fatal disadvantage of being easily knocked out. Therefore, there are many national and social economic losses due to the unsanitary problem that the rusty water comes out from the drinking water due to the aging corrosion corrosion water pipe in the domestic and foreign countries and the pipe is broken 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, austenitic stainless steels contain expensive nickel and are expensive.

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 containing a hydroxyl group-containing fluorocopolymer coated thereon without using the primer coating as a vehicle Japanese Unexamined Patent Publication (Kokai) 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, To form an aluminum / stainless steel clad plate It has been proposed in the art of forming ashes.

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, clad plates coated or bonded with such stainless steel have very low practicality due to the inconvenient problems such as steel tube manufacturing, application of various shapes of steel or joint structures using such basic coating technology, and failures .

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

In order to solve the problems of the prior art as described above, it is an object of the present invention 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 steel bars are manufactured.

Accordingly, an object of the present invention is to provide a stainless steel clad sheet having a metal spray coating layer on a steel sheet and a stainless steel sheet clad on the metal spray coating layer.

Another object of the present invention is to provide a stainless steel clad sheet having excellent bonding properties and having excellent bonding properties in the production of steel tubes and various sections.

It is still another object of the present invention to provide a method of manufacturing a stainless steel clad sheet having a metal spray coating layer on a steel plate, and a stainless steel plate on which the stainless steel plate is clad-rolled and brazed.

In order to solve the problems of the present invention as described above, the present invention provides a method of manufacturing a stainless steel sheet, which comprises a steel plate as a base material, a spray coating layer formed on the stainless steel plate and a stainless steel plate, Clad steel sheet is provided.

According to another aspect of the present invention, there is provided a method of manufacturing a 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; Rolling and brazing a stainless steel plate onto a sprayed coating surface of a steel plate to perform clad rolling; The present invention also provides a method for producing a stainless steel clad sheet.

The stainless steel clad sheet according to the present invention can be produced by clad rolling and brazing a steel sheet material and a stainless steel sheet material by a metal spray coating layer so that a clad sheet can be mass produced by an automated process and a metal including stainless steel By spray coating using a wire and bonding the stainless steel plate to the spray coating layer, the bonding properties of the stainless steel clad sheet are excellent.

In addition, the stainless steel clad sheet according to the present invention has excellent bonding properties between steel and stainless steel, and because of the presence of the stainless steel thermal spray coating layer, it is possible to maintain excellent physical properties in the process of forming various shapes of steel, And is excellent in abrasion resistance and widely applicable to steel structures requiring corrosion resistance.

FIG. 1 is a view showing an example of a stainless steel clad sheet according to the present invention, in which a spray coating layer is formed as a single spray coating layer in a single region.
FIG. 2 is a view showing an example of a stainless steel clad sheet according to the present invention, in which a thermal spray coating layer is formed as a single thermal spray coating layer region and a central composite thermal spray coating layer region at both ends.
FIG. 3 is an example of a stainless steel clad sheet according to an embodiment of the present invention showing a structure in which a sprayed coating layer structure has a single sprayed coating layer region at both sides and a single sprayed coating layer region and a composite sprayed coating layer region alternately formed.
FIG. 4A is an exemplary view illustrating one embodiment of conceptually illustrating a process portion for forming a spray coating layer between a steel sheet material and a stainless steel sheet material in the process of manufacturing a stainless steel clad sheet according to the present invention. FIG.
FIG. 4B is an exemplary view showing still another embodiment of conceptually illustrating a process portion for forming a spray coating layer between a steel sheet material and a stainless steel sheet material in the process of manufacturing a stainless steel clad sheet 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.

In the present invention, in forming a clad steel sheet by bonding a thin sheet-like stainless steel sheet to a steel sheet material as a base material, there is a sprayed coating layer containing stainless steel between the steel sheet and the stainless steel sheet, The present invention relates to a stainless steel clad sheet useful for various structures requiring corrosion resistance and rigidity.

According to a preferred embodiment of the present invention, the spray coating 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 may have a cross-sectional structure of a stainless steel layer / a spray coating layer / a steel layer or a cross-sectional structure of a stainless steel layer / spray coating layer / steel layer / spray coating layer / stainless steel layer Lt; / RTI > 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, for example, two stainless steel clad plates each having a cross-sectional structure of a stainless steel layer, a spray coating layer and an iron steel layer can be produced in different widths and thicknesses, respectively. Further, the stainless steel clad sheet having the cross-sectional structure of stainless steel layer / spray coating layer / steel layer / spray coating layer / steel layer / stainless steel layer can be manufactured in such a manner that these steel layers are laminated adjacent to each other and spray- have. Also, it may be manufactured as a stainless steel layer / spray coating layer / steel layer / spray coating layer / stainless steel layer.

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 spray coating layer includes a single spray coating layer region made of stainless steel and a composite spray coating layer region made of another metal.

According to a preferred embodiment of the present invention, the thermal spray coating layer includes a composite thermal spray coating layer region consisting of a single thermal spray coating layer region and another metal, alternating between the steel sheet and the stainless steel sheet. Further, the composite spray coating layer region composed of the single spray coating layer region and the other metal may be arranged so as to have at least two or more regions, each of which is continuously and regularly arranged. That is, the spray coating layer may be constituted such that at least one composite spray coating layer region composed of two or more single spray coating layer regions and another metal is alternately and continuously present between the steel sheet material and the stainless steel sheet material. According to the present invention, when a spray coating layer is formed in a form in which a single spray coating layer and a composite spray coating layer region coexist, it is preferable that a single spray coating layer region exists in an outermost region of both tip ends.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a stainless steel clad sheet according to an embodiment of the present invention; FIG.

FIG. 1 is an exemplary view showing a structure in which a thermal spray coating layer is formed on a steel plate material 10 by only a single thermal spray coating layer 21. At this time, it is preferable that the single spray coating layer 21 is spray-coated with a stainless steel component. On the spray coating layer 21, the stainless steel plate 30 is rolled.

2 is a view showing another embodiment of the stainless steel clad sheet according to the present invention in which spray coating layers 21 and 22 formed on a steel plate 10 are coated with a single spray coating layer 21 region at both ends and a composite spray coating layer 22 at the center, And the stainless steel sheet is clad-rolled on the stainless steel sheet. Here, it is preferable that the single spray coating layer 21 is made of stainless steel and the composite spray coating layer 22 is made of one or more components selected from iron, aluminum and non-ferrous metals, preferably iron or a mixture of iron and aluminum.

FIG. 3 is a cross-sectional view of the steel sheet material 10 in which the sprayed coating layers 21 and 22 are formed and has a single sprayed coating layer 21 region at both ends and a single sprayed coating layer 21 region and a composite sprayed coating layer 22 ) Regions are alternately formed. The stainless steel plate is clad-rolled on the spray coating layers 21 and 22. According to the present invention, the stainless steel clad sheet having such a structure can be used by separating into a plurality of steel sheets by britting in the direction of the arrows (100, 200). In this case, even if the steel sheet is separated by brazing, And a single spray coating layer can always be present in the outermost region where the coating layer is located.

According to a preferred embodiment of the present invention, it is preferable that the spray coating layer is formed by one more than the composite spray coating layer region where the single spray coating layer region is made of another metal. In addition, it is preferable that a single coating layer is located in the spray coating layer on 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 present at the tip of the cut end, This is advantageous for welding.

According to a preferred embodiment of the present invention, it is preferable that the spray coating layer is formed so that the area of the single spray coating layer is at least as wide as possible for slitting the steel sheet.

According to a preferred embodiment of the present invention, a single spray coating layer among the spray coating layers may be a mixture of stainless steel or stainless steel as a main component. In addition, the composite spray coating layer may be made of steel, aluminum, a mixture thereof, or the like, or 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, it is preferable that the thickness of the spray coating layer is 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 for manufacturing the stainless steel clad sheet according to the present invention will be described in detail as follows.

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

According to a preferred embodiment of the present invention, stainless steel clad steel sheet manufacture is carried out by preparing a step of 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 performing a rolling brazing process with a step of spraying a metal wire on at least two kinds of joint surfaces of the respective plate materials, 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 process through a separate trench production line is loosened from the coil, , It is also possible to continuously produce a multi-layered steel pipe having a stainless steel clad cross-sectional structure through a high frequency preheating step, a high frequency welding step and a steel pipe cutting step. Further, similarly, a beam-shaped section steel having various bent sections can be produced by slitting the clad steel sheet.

According to a preferred embodiment of the present invention, a high-frequency preheating step can be carried out for joining the stainless steel clad sheet in 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 of the welded surface between the clad steel sheets before the high frequency welding, It is also possible to carry out welding with a junction of excellent physical properties at the same time point at which the molten state is achieved.

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 sheet and the steel pipe can be preferably used as a clad steel pipe for waterworks, industrial use and the like.

Hereinafter, a method of manufacturing the stainless steel clad sheet 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 on each surface may be installed and the apparatus of one surface 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, consumption of energy, consumables, and the like is less compared to the sanding process by the air compression injection method, It is possible to carry out the sanding process.

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 a conveying device 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. In this case, a screw-shaped rotating body for assisting the circulating system of the sanding particles can be laid out to divide the sanding particles into two parts in the forward and backward directions, so that the circulating state can be established. 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 located above the first and second conveying rolls is rotated by the rotation of the process rolling rolls while passing the steel plate passing through the second conveying rolls 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 conveyed steel sheet can be maintained. For this purpose, 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, the spray coating process is a process in which the steel sheet material and the stainless steel sheet material are stacked by the rolling rolls 50a and 50b as illustrated in Figs. 4A and 4B, The spray coating can be continuously performed in a predetermined position or in parallel with the above two methods.

According to a preferred embodiment of the present invention, the spray coating process can be carried out in a coating room by 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. In this process, the melted spray coating material is sprayed uniformly onto the steel plate as the clad base material at a point immediately before the stainless steel plate is laminated by using the gas pressure supplied by supplying the gas and air mixture gas, It can be done.

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 coating layer can be formed by using stainless steel as a spray coating material. For example, when a single spray coating layer and a composite spray coating layer are alternately spray coated to form a composite spray coating material, steel or steel and aluminum Spray coating may be performed by applying a mixed metal component. 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, The spray gun can 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 when the spray coating layer is to be composed of a plurality of single spray coating layers and one or more composite spray coatings.

4A and 4B illustrate the timing of the thermal spray coating process. FIG. 4A shows a state in which a stainless steel plate 30 continuously running on a continuous steel plate 10 in a metal wire thermal spray coating process is laminated FIG. 6 is an exemplary view conceptually illustrating a case where a process portion in which spray coating is performed using the spray coating gun 40 at the beginning of rolling is performed at the top and bottom. 4B is a cross-sectional view of the spray coating gun 40 in a stepwise manner at a predetermined point immediately before the stainless steel plate 30 continuously running on the steel plate 10 continuously running in the metal wire spray coating step And forming a sprayed coating layer 20 on the surface of the base material 20, according to another embodiment of the present invention. Here, the spray coating layer 20 includes a case including a single spray coating layer 21 or a composite spray coating layer 22, and reference numerals 50a and 50b are rolling rolls.

According to a preferred embodiment of the present invention, the thermal spray coating method may be a method for maintaining the uniformity of the grain size of the spray coating layer between the steel sheet material and the stainless steel sheet as the clad base material. Preferably, The sprayed coating region may be divided into at least two or more sprayed coating regions, and the sprayed coating region may be divided into at least two or more materials.

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 steel sheet is a thin plate having a thickness of 0.3 mm to 0.8 mm or less, even if a clad sheet is manufactured, There is a problem that it is not possible to jointly weld the two ends of the clad steel plate by welding in high frequency welding. Therefore, according to the present invention, a single spray coating layer region in which a wire arc thermal spray coating is performed on a stainless steel metal in a certain region of a high frequency welding portion, that is, a periphery of a clad steel plate around which high frequency welding is performed, The surface of the steel plate in a region other than the region is spray-coated with another metal component such as aluminum or steel alloy so that the spray coating is performed so as to become a composite spray coating layer region. At least at the tip of the clad steel plate, The thickness of the spray coating layer including stainless steel constituting the single spray coating layer in addition to the thickness is added, so that the compensation effect that the thickness becomes relatively thick due to the same metallic coating of the stainless steel on the weld portion can be obtained .

Therefore, the clad steel sheet to which the spray coating method according to the present invention is applied is not limited to the intermetallic fusion of the high-frequency welding process, which is a core process in the process of welding the steel pipe or the clad steel plate using the same, It exerts a remarkable effect of excellence.

In order to effectively manufacture the steel pipe using the manufactured stainless steel clad steel sheet, the steel plate and the stainless steel plate constituting the clad base material are manufactured so as to have a single sprayed coating layer region of stainless steel toward the continuous movement direction When the clad steel sheet is to be slit in the gauging process using the clad steel sheet (refer to the example of slitting in the direction of arrows 100 and 200 in FIG. 3), at least the interval It is preferable to perform spray coating so as to have a single spray coating layer region.

Therefore, the high frequency welding part may be made of stainless steel to form a single spray coating layer and the other part may be spray coated with a different metallic material. To this end, in the present invention, the clad steel sheet is manufactured to have a plurality of repeated single and composite spray coating layer regions so as to allow a plurality of slits (see FIG. 3) Applicable in an 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, the low temperature heating and the method of spray coating with a certain amount of the gas are performed at a predetermined position corresponding to a time point immediately before the steel plate material and the stainless steel plate material are rolled together, This is the preferred method that can be suitably applied in the case of spray coating.

According to a preferred embodiment of the present invention, in the metal wire thermal spray coating method, at least two spray coating guns are positioned on the front and back surfaces of the steel sheet material so that simultaneous thermal spray coating can be performed on the upper and lower surfaces of the sheet material . In addition, the spray coating process on either side may not be performed depending on the manufacturing conditions of the clad steel plate and 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 a two-wire spray coating material made of the same metal to one spray coating gun and a means for automatically controlling the main power And can be used for spray coating. At this time, for example, a spray coating gun is fixed by using a bracket, and a device for adjusting the angle of up and down and right and left is arranged on the bracket so as to be symmetrically installed at appropriate positions on both sides of the coating of the steel plate, Can be configured. 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 chamber through the opening formed in the lower part of the spray coating chamber, 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., 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 that supplies the gas supplied through the preheating section to the spray coating gun and injects it. It can be generated.

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 process can be preferably applied since the laminating rate and coating property are improved as the toughness of the spray coating material increases. Such a spray coating process can be preferably applied to the process illustrated in Fig. 4B. In particular, as the temperature of the metal increases, the toughness of the conditions for the coating increases, and by using the preheated gas for the 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 on the spray coating material when the material of the spray coating material is excellent in the ductility of the metal and the spray coating material is sprayed on the spray coating gun. In the case of applying the coating and simultaneous lamination and the rolling adhesion method, the preheating may not be performed in some cases. Such a spray coating process can be preferably applied to the process illustrated in FIG. 4A. 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 sheet is rolled and brazed on a sphere after a spray coating is applied on the steel sheet to produce a clad steel sheet at the same speed as that of the sprayed steel sheet, 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, It is possible to continuously carry out the step 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 infeed speed, the step of cutting and connecting the plate material to the plate material, have.

According to a preferred embodiment of the present invention, a driving roll for performing a surface treatment process on a stainless steel sheet entering the surface treatment process has a roll axis made of steel that is wider than the maximum width of the entering stainless steel sheet desirable. In this type of roll shaft, a plurality of steel plates (200 to 500 μm) in the form of flanges (? 350 to? 500) are fitted to the width of the plate to be adjusted and the width thereof is adjustably fixed. The air compression cylinder may include an articulated link drive. In addition, the feed roll located on the lower side of the roll roll of the drive roll is a function of receiving the pressing force of the air compression cylinder which is pressed against the plate during the drive operation of the pipe included in the drive roll. A continuous sheet-fed stainless steel plate and a sheet material joined to the steel sheet material The surface scratch of the plate material can be processed with a constant pressing force by using the sheet material driving roll which is opposed to the surface. Through this process, surface roughness (30 탆 to 200 탆) can be successively performed on the entire surface of one side of the stainless steel plate. According to the present invention, the feed roll axis ratio and the driving roll axis point that are supported when the pea wheel is worn by a certain amount during the continuous operation can be varied. At this time, the entire constituent body of the pressurizing driving roll rises, and the function of continuously replenishing the section by the amount of wear and the direction in which the plate material advances, i.e., the edge direction of the plate material, It may include the function of forming a constant scratch on the surface and keeping 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 and the tensioning of such a stainless steel plate, and the supply process of securing a certain space for spray coating from the steel plate immediately before the stainless steel plate is stacked, Lt; RTI ID = 0.0 > before < / RTI >

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, either the cold rolling process or the hot rolling process may be selected as the rolling process. This may 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 clad base materials can be pre-heated to 100 ° C to 350 ° 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, since cold rolling does not preheat the clad sheet, it can be called cold rolling. These two rolling 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, in the spray coating and co-rolling process, the upper and lower rolling rolls 50a and 50b are spray-coated on portions outside the edges of the edges of the stainless steel plate, May be damaged. In order to prevent this, clad rolling can be performed by constructing a film made of a protective coil side-by-side in a rolling mill using a winding shaft and a winding shaft.

By means of a preferred embodiment of the present invention, metal or plastic in the form of a film is picked up and applied in a belt manner in the vertical direction at the midpoint where the rolling rolls are in contact with each other to form a constant portion in contact with the clad plate at the upper and lower ends of the rolling roll The outer periphery of the roll can be wound around the auxiliary shaft which rotates in the same manner as the rotation speed of the rolling roll in the form of surrounding the outer portion of the roll. The apparatus for driving such a film has a control function of holding a film coil on the auxiliary shaft and fixing the auxiliary shaft to the auxiliary shaft and rotating the auxiliary shaft equally according to the rotational speed of the rolling roll, And each of them is constituted by a pair of auxiliary devices on the upper and lower sides of the rolling roll, and can perform the function simultaneously with rolling.

According to the present invention, the stainless steel clad sheet can be manufactured through the above-described process.

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, 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, The slitting process can be continuously performed by continuously advancing the clad plate material by the slitting upper roll and the lower roll in a state in which 1 set of the horizontal rolls and 1 set of the upper and lower horizontal rolls are prepared.

According to a preferred embodiment of the present invention, in the slitting step, the functional configuration of each axis of the upper and lower thrusts is connected to a speed reducer provided with a rotational power, and the slitting blade It can be carried out by engaging and fitting each of them according to the production regulation dimensions. 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.

10: Steel plate
20: spray coating layer
21: Single spray coating layer
22: Composite spray coating layer
30: Stainless steel plate
40: spray coating gun
100, 200: Breeding cutting direction

Claims (22)

A stainless steel clad sheet comprising a structure in which a steel sheet material is used as a base material, a metal thermal spray coating layer including stainless steel is formed thereon, and a stainless steel sheet is clad rolled and brazed thereon.
The stainless steel clad sheet according to claim 1, wherein the metal spray coating layer and the stainless steel sheet material are applied to one side or both sides of the steel sheet material.
The method according to claim 1,
And a cross-sectional 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 / stainless steel.
The stainless steel cladding steel plate according to claim 1, wherein the stainless steel is disposed on the entire outermost surface of one or both surfaces of the steel sheet.
The stainless steel clad sheet according to claim 1, wherein the stainless steel sheet has a thickness of 0.3-2 mm.
The stainless steel clad sheet according to claim 1, wherein the spray coating layer comprises a composite spray coating layer region made of a metal and a single spray coating layer region made of stainless steel.
The stainless steel clad sheet according to claim 1, wherein the spray coating layer has a single spray coating layer region and a composite spray coating layer region alternately and continuously present between the steel sheet material and the stainless steel sheet material.
[7] The method of claim 7, wherein the sprayed coating layer has a single sprayed coating layer always present in the outermost region located at the both ends of the stainless steel clad sheet, and the single sprayed coating layer not in the outermost region is welded Is formed to have a width that is at least as large as possible to include a possible section.
The stainless steel clad sheet according to any one of claims 6 to 8, wherein the composite spray coating layer is made of steel, aluminum, nonferrous metal or a mixture thereof.
The stainless steel clad sheet according to claim 1, wherein the spray coating layer has a thickness of 10 to 500 μm.
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 a stainless steel plate onto a sprayed coating surface of a steel plate to perform clad rolling;
Wherein the stainless steel clad steel sheet is produced by a method comprising the steps of:
The method of manufacturing a stainless steel clad sheet according to claim 11, comprising a sanding step of sanding the surface of the steel plate material in the step of preparing the steel plate material, and a step of cleaning the surface of the sanded steel plate material.
[14] The method according to claim 12, wherein the sanding step is performed by striking the surface of the steel plate with sanding particles to form irregular unevenness on the surface of the steel plate.
The method according to claim 11, wherein the spray coating is carried out by a metal wire arc spray coating method using two metal wires having the same components and charged with opposite polarities in the spray coating room as a coating feedstock. A method of manufacturing a steel sheet.
[12] The method as set forth in claim 11, wherein rolling is started while maintaining a certain space for spray coating on the steel sheet immediately before stacking the continuously progressing stainless steel sheet in the continuous steel sheet in the metal wire spray coating step, Wherein the coating is carried out in a stepwise manner at a predetermined position corresponding to a point immediately before lamination, or by spray coating in parallel with the two methods.
[12] The method of claim 11, wherein, in the step of spraying the metal wire, when spray coating is performed at a predetermined position corresponding to a time point at which the spray coating is performed before the steel sheet and the stainless steel sheet are jointly rolled, Heating the steel plate and the stainless steel plate at a low temperature and filling the spray coating room with gas.
The spray coating according to claim 11, wherein the spray coating is performed by introducing gas, air, or a mixed gas thereof into the spray coating room and preheating the gas, air, or a mixed gas thereof to 100 ° C to 450 ° C, Wherein the step of forming the stainless steel clad sheet is carried out by using a spraying pressure.
The method according to claim 11, wherein the rolling load is 50 kg / cm 2 to 200 kg / cm 2 at the step of rolling and brazing the stainless steel plate on the spray coating surface of the steel plate.
12. The method of manufacturing a stainless steel clad sheet according to claim 11, wherein the step of rolling and brazing the stainless steel plate onto the sprayed coating surface of the steel sheet material is one of cold rolling and hot rolling.
12. The method according to claim 11, further comprising the step of slitting the stainless steel clad sheet produced by rolling and slitting the center of the sprayed coating surface in the spray coating surface.
[12] The method according to claim 11, wherein in the spray coating step, when a simultaneous spray coating and a rolling adhesion method are applied between the steel sheet material and the stainless steel sheet material at the shortest distance in the shortest time, spray coating is performed without preheating the gas, Wherein only compressed air is used without using a mixed gas.
[20] The method of claim 20, wherein at least one of the preheating step, the metal wire arc spray coating, and the rolling step is further performed in the step before the slitting step.

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