Corrosion-resistant stainless steel clad steel plate

Abstract

The utility model belongs to the technical field of composite steel plates, and particularly relates to a corrosion-resistant stainless steel composite steel plate which comprises a base material layer, the upper face and the lower face of the base material layer are tightly combined with covering layers through combining layers, and the base material layer and the covering layers are respectively of a carbon steel structure and a stainless steel structure. The edges of the base material layer, the binding layer and the covering layer are provided with anti-corrosion coating layers, the covering layer is internally provided with a thermal expansion coefficient buffer layer, and stepped transition structures are formed at the edges of the base material layer and the covering layer. Through the gradient transition design of the base material layer and the covering layer, the thermal expansion coefficient buffer layer clamped in the binding layer and the anti-corrosion wrapping layer wrapping the edges of the base material layer and the covering layer, the corrosion resistance and the binding strength of the stainless steel clad steel plate are greatly improved, and the stainless steel clad steel plate is suitable for complex and harsh application environments and has wide application prospects.

Description

Technical Field

[0001] The utility model belongs to the technical field of composite steel plates, and in particular relates to a corrosion-resistant stainless steel composite steel plate. Background Art

[0002] Existing stainless steel clad plates are typically constructed by laminating a stainless steel layer with carbon steel or other materials to combine the corrosion resistance of stainless steel with the high strength and low cost of carbon steel. However, while traditional cladding methods such as hot rolling or explosive welding can achieve a bond between the stainless steel layer and the base material, uneven stress at the composite interface can result in a weak bond. In certain harsh environments, particularly those with rapidly fluctuating temperatures, these clad plates can experience cracks or detachment in the bonded layer due to the differential thermal expansion between the base material and the cover layer caused by these temperature fluctuations.

[0003] Furthermore, in applications, the edges and joints of stainless steel composite plates are often key areas of corrosion. Existing technologies lack structural improvements to address these issues, resulting in poor overall durability and performance. Therefore, designing a structurally innovative stainless steel composite plate to enhance its corrosion resistance and improve bonding strength has become an urgent need. Utility Model Content

[0004] In view of the above problems, the purpose of the present invention is to provide a corrosion-resistant stainless steel composite steel plate to solve the problems of unstable bonding of composite layers and easy corrosion and cracking of edges of stainless steel composite steel plates in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a corrosion-resistant stainless steel composite steel plate, comprising a substrate layer, the upper and lower surfaces of the substrate layer are tightly bonded to a covering layer through a bonding layer, the substrate layer and the covering layer are respectively a carbon steel structure and a stainless steel structure, the edges of the substrate layer, the bonding layer and the covering layer are provided with an anti-corrosion coating layer, a thermal expansion coefficient buffer layer is provided in the covering layer, and a stepped transition structure is formed at the edges of the substrate layer and the covering layer.

[0006] The beneficial effects of the utility model are: through the gradient transition design of the base material layer and the covering layer, the thermal expansion coefficient buffer layer sandwiched in the bonding layer, and the anti-corrosion coating layer covering the edges of the base material layer and the covering layer, the corrosion resistance and bonding strength of the stainless steel composite steel plate are greatly improved, which is suitable for complex and harsh application environments and has broad application prospects.

[0007] In order to effectively prevent the edge area from being delaminated or corroded by the external environment;

[0008] As a further improvement of the above technical solution: the anti-corrosion coating layer is an elastic polyurea anti-corrosion coating, and the end of the anti-corrosion coating layer is flush with the outer surface of the covering layer.

[0009] The beneficial effect of this improvement is that the anti-corrosion coating covers the edge of the composite steel plate, preventing the edge area from being delaminated or corroded due to erosion by the external environment.

[0010] In order to reduce the stress concentration between the substrate layer and the cover layer and prevent stress peeling at the bonding interface;

[0011] As a further improvement of the above technical solution: the groove depth of the stepped transition structure at the edges of the substrate layer and the covering layer gradually increases from the edges to the center of the substrate layer and the covering layer.

[0012] The beneficial effect of this improvement is that the gradient transition structure reduces stress concentration between the substrate layer and the covering layer by gradually changing the thickness or density of the material, thereby preventing stress peeling from occurring at the bonding interface.

[0013] To relieve the stress caused by the difference in thermal expansion coefficient between the substrate layer and the cover layer under temperature changes, which may cause cracks or peeling;

[0014] As a further improvement of the above technical solution: the thermal expansion coefficient buffer layer is buried in the middle of the bonding layer, and the length and width of the thermal expansion coefficient buffer layer are the same as those of the substrate layer and the covering layer. The thermal expansion coefficient buffer layer is a nickel-titanium alloy structure with a thickness of 0.05 mm to 0.2 mm.

[0015] The beneficial effect of this improvement is that the thermal expansion coefficient buffer layer has excellent elastic recovery ability, which can buffer the thermal expansion difference between the base material layer and the stainless steel layer at different temperatures, and avoid cracks or peeling between the composite steel plate layers.

[0016] In order to effectively increase the toughness and fatigue resistance of the bonding layer;

[0017] As a further improvement of the above technical solution: the surface of the bonding layer is evenly distributed with microporous structures.

[0018] The beneficial effect of this improvement is that the bonding layer releases internal stress through the micropores, thereby enhancing the toughness and fatigue resistance of the bonding layer.

[0019] In order to further enhance the wear resistance and corrosion resistance of the steel plate surface;

[0020] As a further improvement of the above technical solution: the side of the covering layer facing away from the substrate layer is coated with a wear-resistant and anti-corrosion coating, and the wear-resistant and anti-corrosion coating is a fluorocarbon coating with a thickness of 60 μm to 110 μm.

[0021] The beneficial effect of this improvement is that the wear-resistant and anti-corrosion coating can effectively enhance the wear resistance and corrosion resistance of the steel plate surface.

[0022] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front sectional view of the present utility model;

[0024] Figure 2 It is a top view of the utility model;

[0025] Figure 3 It is an enlarged view of A in the present utility model;

[0026] In the figure: 1. Base material layer; 2. Bonding layer; 3. Covering layer; 4. Thermal expansion coefficient buffer layer; 5. Wear-resistant and anti-corrosion coating; 6. Anti-corrosion coating layer. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0028] Example 1:

[0029] like Figure 1—3 shows: a corrosion-resistant stainless steel composite steel plate, comprising a substrate layer 1, wherein the upper and lower surfaces of the substrate layer 1 are tightly bonded with a covering layer 3 via a bonding layer 2, wherein the substrate layer 1 and the covering layer 3 are respectively carbon steel structures and stainless steel structures, and an anti-corrosion coating layer 6 is provided at the edges of the substrate layer 1, the bonding layer 2 and the covering layer 3, and a thermal expansion coefficient buffer layer 4 is provided in the covering layer 3, and a stepped transition structure is formed at the edges of the substrate layer 1 and the covering layer 3. Through the gradient transition design of the substrate layer 1 and the covering layer 3, the thermal expansion coefficient buffer layer 4 is sandwiched between the bonding layer 2 and the covering layer 3. The expansion coefficient buffer layer 4 and the anti-corrosion coating layer 6 covering the edge of the base layer 1 and the covering layer 3 greatly improve the corrosion resistance and bonding strength of the stainless steel composite steel plate, which is suitable for complex and harsh application environments and has broad application prospects. The anti-corrosion coating layer 6 is an elastic polyurea anti-corrosion coating. The end of the anti-corrosion coating layer 6 is flush with the outer surface of the covering layer 3. The anti-corrosion coating layer 6 covers the edge of the composite steel plate to prevent the edge area from being delaminated or corroded by the erosion of the external environment. The stepped edges of the base layer 1 and the covering layer 3 are The groove depth of the transition structure increases gradually from the edge to the center of the substrate layer 1 and the covering layer 3. The gradient transition structure reduces the stress concentration between the substrate layer 1 and the covering layer 3 by gradually changing the thickness or density of the material, thereby preventing stress peeling from occurring at the bonding interface. The thermal expansion coefficient buffer layer 4 is buried in the middle of the bonding layer 2, and the length and width of the thermal expansion coefficient buffer layer 4 are the same as those of the substrate layer 1 and the covering layer 3. The thermal expansion coefficient buffer layer 4 is a nickel-titanium alloy structure with a thickness of 0.05 mm to 0.2 mm. The thermal expansion coefficient buffer layer 4 has excellent The bonding layer 2 has a unique elastic recovery ability, which can buffer the thermal expansion difference between the substrate layer and the stainless steel layer at different temperatures, and avoid cracks or peeling between the composite steel plate layers. The surface of the bonding layer 2 is evenly distributed with a microporous structure. The bonding layer 2 releases internal stress through the micropores, thereby enhancing the toughness and fatigue resistance of the bonding layer. The covering layer 3 is coated with a wear-resistant and anti-corrosion coating 5 on the side facing away from the substrate layer 1. The wear-resistant and anti-corrosion coating 5 is a fluorocarbon coating with a thickness of 60μm to 110μm. The wear-resistant and anti-corrosion coating 5 can effectively enhance the wear resistance and corrosion resistance of the steel plate surface.

[0030] The working principle of this technical solution is as follows: high-quality carbon steel or other structural steel is selected as the base layer 1, and stainless steel with good corrosion resistance is used as the covering layer 3. Multiple trapezoidal transition gradient structures are die-cast on the edges of the base layer 1 and the covering layer 3; the thermal expansion coefficient buffer layer 4, the bonding layer 2, the base layer 1, and the covering layer 3 are pressed together using hot rolling technology. The hot rolling bonding can tightly combine the various layers of materials at high temperatures to form a stable multi-layer structure; after the steel plate is formed, the anti-corrosion coating 6 is wrapped to ensure that the edge of the steel plate is not affected by the external corrosive environment during use; finally, the wear-resistant and anti-corrosion coating 5 is processed and formed on the surface of the covering layer 3.

[0031] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0032] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A corrosion-resistant stainless steel composite plate, characterized by: The invention comprises a base material layer (1), wherein the upper and lower surfaces of the base material layer (1) are tightly bonded to a covering layer (3) via a bonding layer (2), the base material layer (1) and the covering layer (3) are respectively a carbon steel structure and a stainless steel structure, an anti-corrosion coating layer (6) is provided at the edges of the base material layer (1), the bonding layer (2) and the covering layer (3), a thermal expansion coefficient buffer layer (4) is provided in the covering layer (3), and a stepped transition structure is formed at the edges of the base material layer (1) and the covering layer (3).

2. The corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The anti-corrosion coating layer (6) is an elastic polyurea anti-corrosion coating, and the end of the anti-corrosion coating layer (6) is flush with the outer surface of the covering layer (3).

3. The corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The groove depth of the stepped transition structure at the edges of the substrate layer (1) and the covering layer (3) gradually increases in the direction from the edges to the center of the substrate layer (1) and the covering layer (3).

4. The corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The thermal expansion coefficient buffer layer (4) is embedded in the middle of the bonding layer (2), and the length and width of the thermal expansion coefficient buffer layer (4) are the same as those of the base material layer (1) and the covering layer (3). The thermal expansion coefficient buffer layer (4) is a nickel-titanium alloy structure with a thickness of 0.05 mm to 0.2 mm.

5. The corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The surface of the bonding layer (2) is evenly distributed with microporous structures.

6. The corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The side of the covering layer (3) facing away from the substrate layer (1) is coated with a wear-resistant and corrosion-resistant coating (5), and the wear-resistant and corrosion-resistant coating (5) is a fluorocarbon coating with a thickness of 60 μm to 110 μm.

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