A stainless steel composite plate and its preparation method

Abstract

This invention provides a stainless steel composite plate and its preparation method, belonging to the field of metallurgical process technology. The stainless steel composite plate includes a substrate and a composite material, which are stacked. A plurality of air guide grooves are provided on the side of the substrate facing the composite material. These air guide grooves are areas on the substrate for bonding with the composite material and extend along the length of the substrate. The air guide grooves converge at one end, and a vertical hole is provided on the substrate at the converging end of the air guide grooves, communicating with the air guide grooves through the vertical hole. A horizontal hole is provided on the end face of the substrate, communicating with the vertical hole, and the exposed end of the horizontal hole is adapted to communicate with a vacuum extraction device. By providing air guide grooves on the bonding surface of the substrate for bonding with the composite material, the stainless steel composite plate of this invention can improve the vacuum extraction effect and ensure the vacuum degree between the two plates during vacuum extraction.

Description

Technical Field

[0001] This invention relates to the field of metallurgical process technology, specifically to a stainless steel composite plate and its preparation method. Background Technology

[0002] The manufacturing process of stainless steel composite plates involves raw material surface processing, brazing and diffusion welding technologies, isolation and vacuum technologies.

[0003] For example, Chinese patent document CN116160753A discloses a single-sided stainless steel composite plate and its preparation method, wherein the composite billet preparation process includes: surface cleaning and circumferential welding of the billet. The circumferential welding of the billet is to weld around the perimeter of the surfaces to be bonded of the carbon steel substrate and the stainless steel composite material under vacuum conditions to obtain the composite billet.

[0004] However, during the preparation of the aforementioned stainless steel composite plate, the vacuum extraction process uses a common method of welding the vacuum tube into the weld to extract the vacuum. There may be residual air in some areas. If there is air between the plates during the rolling process, after being heated to more than 1,000 degrees for a long time, the gas expands and the pressure inside the plate surges, which can cause the billet to burst open and the rolled product to have a large number of unbonded areas. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that air residue is easily left between the substrate and the composite material in the existing stainless steel composite plate, thereby providing a stainless steel composite plate and its preparation method.

[0006] To solve the above-mentioned technical problems, the present invention provides a stainless steel composite plate, comprising: a substrate and a composite material, wherein the substrate and the composite material are stacked, and a plurality of air guide grooves are provided on the side of the substrate facing the composite material, wherein the plurality of air guide grooves are areas on the substrate for bonding with the composite material and extend along the length direction of the substrate.

[0007] A plurality of the air guide grooves converge at one end, and a vertical hole is provided on the substrate at the converging end of the air guide grooves, which communicates with the plurality of air guide grooves through the vertical hole;

[0008] The substrate has a horizontal hole on its end face that communicates with the vertical hole, and the exposed end of the horizontal hole is adapted to communicate with a vacuum extraction device.

[0009] Optionally, the composite material has two parts, wherein the first composite material covers the front side of the substrate and the second composite material covers the back side of the substrate;

[0010] The substrate has air guide grooves on its front and back sides respectively, and the vertical hole passes through the front and back sides of the substrate and communicates with the air guide grooves on the front and back sides respectively.

[0011] Optionally, the substrate has a U-shaped bevel around the area for bonding with the composite material.

[0012] Optionally, the relationship between the bottom width a1, depth h1 and top width b1 of the U-shaped bevel on the long side of the substrate is 1:3:2.5, where a1 = 10% of the substrate thickness;

[0013] The relationship between the bottom width a2, depth h2, and top width b2 of the U-shaped bevel on the short side of the substrate is 1:4:3, where a2 = 10% of the substrate thickness.

[0014] Optionally, the diameter of the vertical hole is 12-16 mm, and the distance from the center of the vertical hole to the edge of the U-shaped bevel is 10-20 mm.

[0015] Optionally, the diameter of the transverse hole is 10-12 mm.

[0016] Optionally, a plurality of the air guide grooves extend parallel to each other on the mating surface of the substrate.

[0017] This invention provides a method for preparing a stainless steel composite plate, comprising the following steps:

[0018] Vacuum hole preparation: Drill a vertical hole at the middle position of one end of the bonding surface of the substrate, and drill a horizontal hole on the end face of the same end, so that the horizontal hole and the vertical hole are connected.

[0019] Preparation of air guide grooves: Several air guide grooves are provided on the bonding surface of the substrate, and one end of the several air guide grooves is connected to the vertical hole;

[0020] Treatment of the mating surface: The mating surface of the substrate and the composite material is processed to ensure that the surface roughness of the mating surface of the substrate and the composite material meets Ra≤25;

[0021] Sealing welding: The substrate and composite material are stacked on a pressure platform and pressurized by the pressure platform to fill the bevel around the bonding surface of the substrate and composite material.

[0022] Vacuum extraction: A vacuum extraction tube is welded to the exposed end of the transverse hole. This tube is connected to a vacuum extraction device, which is used to ensure that the vacuum value between the substrate and the composite material is ≤1.0*10. -3 After the vacuum requirement is met, the extraction vacuum tube is sealed.

[0023] Optionally, the sealing welding is performed in two steps: first, CO2 shielded welding is used for the second step, and then submerged arc welding is used for the third step.

[0024] Optionally, the welding current for the MIG welding is 120-180A, the welding voltage is 20-25V, and the gas flow rate is 8-12L / min;

[0025] The submerged arc welding current is 400-600A, and multiple welding passes are used until the bevel is filled.

[0026] The technical solution of this invention has the following advantages:

[0027] 1. The stainless steel composite plate provided by the present invention, by setting an air guide groove on the mating surface of the substrate for mating with the composite material, can improve the vacuuming effect and ensure the vacuum degree between the two plates during vacuuming.

[0028] 2. The stainless steel composite plate provided by the present invention, through the setting of the U-shaped bevel, can avoid the problem of gap areas where the weld is not bonded during the welding process. At the same time, the finished product has enhanced edge bonding strength and is less prone to cracking.

[0029] 3. The method for preparing stainless steel composite plates provided by the present invention involves setting air guide grooves on the mating surface of the substrate for cooperation with the composite material, so as to facilitate vacuum extraction, thereby making the bonding between the substrate and the composite material tighter. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 A flowchart illustrating a specific embodiment of the stainless steel composite plate preparation method provided in the embodiments of the present invention;

[0032] Figure 2 This is a front sectional view of a specific embodiment of the stainless steel composite plate provided in the embodiments of the present invention;

[0033] Figure 3 for Figure 2 A schematic diagram of the internal horizontal and vertical holes of the substrate;

[0034] Figure 4 for Figure 3 A schematic diagram of the end side of the substrate;

[0035] Figure 5 for Figure 3 Top view of the substrate.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Substrate; 2. First composite material; 3. Second composite material; 4. Air guide groove; 5. Vertical hole; 6. Horizontal hole; 7. Bevel. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] The stainless steel composite plate provided in this embodiment can be used for surface embossing.

[0043] like Figure 2-5The image shows a specific embodiment of the stainless steel composite plate provided in this example, comprising: a substrate 1 and a composite material, wherein the substrate 1 and the composite material are stacked, and a plurality of air guide grooves 4 are provided on the side of the substrate 1 facing the composite material. The plurality of air guide grooves 4 are areas on the substrate 1 for bonding with the composite material and extend along the length direction of the substrate 1; the plurality of air guide grooves 4 converge at one end, and a vertical hole 5 is provided on the substrate 1 at the converging end of the air guide grooves 4, which communicates with the plurality of air guide grooves 4; a horizontal hole 6 is provided on the end face of the substrate 1, which communicates with the vertical hole 5, and the exposed end of the horizontal hole 6 is adapted to communicate with a vacuum extraction device.

[0044] The stainless steel composite plate provided in this embodiment improves the vacuuming effect and ensures the vacuum level between the two plates by setting air guide grooves 4 on the mating surface of the substrate 1 for cooperation with the composite material during vacuuming. Furthermore, compared to the previous vacuuming method where the vacuum tube was welded into the weld seam, which connected the vacuum tube to the gap between the substrate and the composite material, easily leading to air residue and quality problems, this embodiment avoids these problems by drilling vacuum holes in the substrate.

[0045] like Figure 2 As shown, in the stainless steel composite plate provided in this embodiment, the composite material has two pieces, wherein the first composite material 2 covers the front side of the substrate 1, and the second composite material 3 covers the back side of the substrate 1. The double-sided composite material arrangement makes the force on both sides of the substrate more even, which can avoid the occurrence of warping. The front and back sides of the substrate 1 are respectively provided with air guide grooves 4, and the vertical hole 5 penetrates through the front and back sides of the substrate 1 and communicates with the air guide grooves 4 on the front and back sides respectively. That is to say, the stainless steel composite plate provided in this embodiment is a double-sided stainless steel composite plate. This embodiment can achieve double-sided embossing by setting the stainless steel composite material on both sides. Of course, the above features are not limiting. In some alternative embodiments, the composite material can also be set on one side.

[0046] like Figure 3 , Figure 4 As shown, in the stainless steel composite plate provided in this embodiment, a U-shaped bevel 7 is provided around the area on the substrate 1 used for bonding with the composite material. Compared with the previous V-shaped bevel, which had a welding gap area, after a compression ratio of thirty times, especially at the boundary where two different materials are joined, small unbonded areas are magnified, creating unbonded areas inside the finished product, leading to product defects. This embodiment, through the setting of the U-shaped bevel 7, increases the welding strength, avoids the problem of gap areas during welding, reduces the occurrence of edge breakage, and makes the edges of the finished plate less prone to cracking.

[0047] like Figure 3 , Figure 4 As shown, in the stainless steel composite plate provided in this embodiment, the relationship between the bottom width a1, depth h1, and top width b1 of the U-shaped bevel 7 on the long side of the substrate 1 is 1:3:2.5, where a1 = 10% of the substrate thickness; the relationship between the bottom width a2, depth h2, and top width b2 of the U-shaped bevel 7 on the short side of the substrate 1 is 1:4:3, where a2 = 10% of the substrate thickness. Specifically, as... Figure 3 As shown, the bottom width a1 = 10mm, depth h1 = 30mm, and top width b1 = 25mm can be set on the long side; for example... Figure 4 As shown, the bottom width a2 = 10mm, depth h2 = 40mm, and top width b2 = 30mm can be set on the short side. Since the short side of the substrate 1 is relatively short, the bevel 7 on the short side is set to be deeper to increase the strength after welding.

[0048] like Figure 3 , Figure 4 As shown, in the stainless steel composite plate provided in this embodiment, the diameter of the vertical hole 5 is 12-16 mm, and the distance from the center of the vertical hole 5 to the edge of the U-shaped bevel 7 is 10-20 mm. Specifically, for example, the diameter of the vertical hole 5 can be 14 mm, and the distance from the edge of the bevel 7 can be 15 mm.

[0049] like Figure 3 , Figure 4 As shown, in the stainless steel composite plate provided in this embodiment, the horizontal hole 6 is located in the middle of the end, and its diameter is 10-12 mm. Specifically, for example, the diameter of the horizontal hole 6 can be 10 mm. This processing method allows for the vacuum of the upper and lower layers to be extracted in one operation, while maintaining a consistent vacuum value, reducing processing steps and saving costs.

[0050] like Figure 5 As shown, in the stainless steel composite plate provided in this embodiment, a plurality of the air guide grooves 4 extend parallel and spaced along the bonding surface of the substrate 1. This arrangement allows for uniform vacuum extraction of the space between the substrate 1 and the composite material, ensuring vacuum stability between the two plates.

[0051] In addition, this embodiment also provides a method for preparing a stainless steel composite plate, such as... Figure 1 As shown, it includes the following steps:

[0052] Preparation of Substrate 1 and Composite Material: This embodiment does not have special requirements for the materials of Substrate 1 and Composite Material. For example, the grade of Substrate 1 can be Q235, HPCC, 210, etc., and the grade of Composite Material can be 304, 316L, 310S, etc. The thickness of Substrate 1 and Composite Material is calculated based on the finished product thickness according to the principle of proportional rolling. The thickness of the surface composite layer must be ≥0.1mm, and the length and width of Substrate 1 and Composite Material should be consistent.

[0053] Cutting the bevel 7 of the substrate 1: In this step, the U-shaped bevel 7 described in the above embodiment can be used, which can improve the bonding tightness between the substrate 1 and the composite material after welding.

[0054] Vacuum hole preparation: Drill a vertical hole 5 at the middle position of one end of the mating surface of the substrate 1, and drill a horizontal hole 6 on the end face of the same end, so that the horizontal hole 6 is connected to the vertical hole 5.

[0055] Surface processing of substrate 1 composite material: including the preparation of air guide groove 4 and the treatment of the mating surface;

[0056] Preparation of air guide groove 4: A plurality of air guide grooves 4 are provided on the bonding surface of the substrate 1, and one end of the plurality of air guide grooves 4 is connected to the vertical hole 5;

[0057] The bonding surfaces are treated: the bonding surfaces of the substrate 1 and the composite are processed to ensure that the surface roughness of the bonding surfaces of the substrate 1 and the composite meets Ra≤25; with this setting, the bonding surfaces after processing do not need to be coated with a release agent, saving costs.

[0058] Sealing welding: includes two steps: sealing the substrate 1 composite material and submerged arc welding;

[0059] First, the substrate 1 and the composite layer are stacked on a pressure platform and pressurized by the pressure platform to 200-550 MPa. Then, carbon dioxide shielded welding is used for secondary welding to complete the sealing.

[0060] Then, the bevel 7 around the bonding surface of the substrate 1 and the composite material is filled by submerged arc welding.

[0061] Vacuum extraction: A vacuum extraction tube is welded to the exposed end of the transverse hole 6. This vacuum extraction tube is connected to a vacuum extraction device, which is used to ensure that the vacuum value between the substrate 1 and the composite material is ≤1.0*10. -3 After the vacuum requirement is met, the extraction vacuum tube is sealed.

[0062] In the above-mentioned method for preparing stainless steel composite plates, the welding current for MIG welding is 120–180A, the welding voltage is 20–25V, and the gas flow rate is 8–12L / min; the submerged arc welding current is 400–600A, and multiple passes are used until the groove 7 is completely filled. These two welding steps prevent flux from falling into the seam during submerged arc welding, thus avoiding the production of defective products.

[0063] The preparation method provided in this embodiment has a tight production process, high production efficiency, and high yield. It solves the problems of warping and non-bonding of finished products caused by factors such as different material densities, different elongations, and local air residue in bimetallic composite plates. The product can replace the use of pure stainless steel, reduce the consumption of precious metals, significantly reduce project costs, and achieve a perfect combination of low cost and high performance.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for preparing a stainless steel composite plate, characterized in that, Includes the following steps: Beveling: A U-shaped bevel (7) is provided around the area on the substrate (1) for bonding with the composite material. Vacuum hole preparation: Drill a vertical hole (5) at the middle position of one end of the bonding surface of the substrate (1), and drill a horizontal hole (6) on the end face of the same end, so that the horizontal hole (6) is connected to the vertical hole (5). Preparation of air guide groove (4): Several air guide grooves (4) are provided on the bonding surface of the substrate (1), and one end of several air guide grooves (4) is connected to the vertical hole (5); Processing the bonding surface: Process the bonding surface of the substrate (1) and the composite material so that the surface roughness of the bonding surface of the substrate (1) and the composite material meets Ra≤25; Sealing welding: The substrate (1) and the composite material are stacked on a pressure platform and pressurized by 200~550MPa through the pressure platform to fill the U-shaped bevel (7) around the joint surface of the substrate (1) and the composite material; Vacuum extraction: A vacuum extraction tube is welded to the exposed end of the transverse hole (6), and the vacuum extraction tube is connected to a vacuum extraction device. The vacuum extraction device is used to ensure that the vacuum value between the substrate (1) and the composite material is ≤1.0*10. -3 Pa, after the vacuum requirement is met, the extraction vacuum tube is sealed. The composite material has two parts, wherein the first composite material (2) covers the front side of the substrate (1) and the second composite material (3) covers the back side of the substrate (1); The front and back sides of the substrate (1) are respectively provided with the air guide groove (4), and the vertical hole (5) passes through the front and back sides of the substrate (1) and communicates with the air guide groove (4) on the front and back sides respectively.

2. The method for preparing the stainless steel composite plate according to claim 1, characterized in that, The sealing welding is carried out in two steps. The first step is to use CO2 shielded welding for MIG welding, and the second step is to use submerged arc welding for submerged arc welding.

3. The method for preparing the stainless steel composite plate according to claim 2, characterized in that, The welding current for the MIG welding is 120~180A, the welding voltage is 20~25V, and the gas flow rate is 8~12L / min; The current for submerged arc welding is 400~600A, and multiple passes are used until the U-shaped groove (7) is filled.

4. A stainless steel composite plate produced by the method for preparing a stainless steel composite plate according to any one of claims 1-3, characterized in that, include: The substrate (1) and the composite are stacked together. The side of the substrate (1) facing the composite is provided with a plurality of air guide grooves (4). The plurality of air guide grooves (4) are located on the substrate (1) in the area for bonding with the composite and extend along the length direction of the substrate (1). A plurality of the air guide grooves (4) converge at one end, and a vertical hole (5) is provided on the substrate (1) at the converging end of the air guide grooves (4), and the vertical hole (5) communicates with the plurality of air guide grooves (4); The substrate (1) has a transverse hole (6) on its end face that communicates with the vertical hole (5), and the exposed end of the transverse hole (6) is adapted to communicate with a vacuum extraction device. The composite material has two parts, wherein the first composite material (2) covers the front side of the substrate (1) and the second composite material (3) covers the back side of the substrate (1); The front and back sides of the substrate (1) are respectively provided with the air guide groove (4), and the vertical hole (5) passes through the front and back sides of the substrate (1) and communicates with the air guide groove (4) on the front and back sides respectively; a U-shaped bevel (7) is provided around the area of ​​the substrate (1) used to bond with the composite material.

5. The stainless steel composite plate according to claim 4, characterized in that, The relationship between the bottom width a1, depth h1 and top width b1 of the U-shaped bevel (7) on the long side of the substrate (1) is 1:3:2.5, where a1 = 10% of the substrate thickness; The U-shaped bevel (7) has a bottom width a2, depth h2 and top width b2 on the short side of the substrate (1) in a ratio of 1:4:3, where a2 = 10% of the substrate thickness.

6. The stainless steel composite plate according to claim 4, characterized in that, The diameter of the vertical hole (5) is 12~16mm, and the distance between the center of the vertical hole (5) and the edge of the U-shaped bevel (7) is 10~20mm.

7. The stainless steel composite plate according to claim 6, characterized in that, The diameter of the transverse hole (6) is 10~12mm.

8. The stainless steel composite plate according to any one of claims 4-7, characterized in that, Several of the air guide grooves (4) extend parallel to each other on the mating surface of the substrate (1).

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