Multi-layer corrosion-resistant stainless steel composite plate

Abstract

The utility model discloses a multi-layer corrosion-resistant stainless steel composite plate which comprises a base layer, a primary protection inner layer is arranged on the base layer, a middle layer is arranged on the primary protection inner layer, a secondary outer layer is covered outside the middle layer, and a coating layer is arranged on the secondary outer layer. The base layer is compounded with the primary protection inner layer through explosion, the secondary outer layer is compounded with the covering layer through explosion, and the primary protection inner layer and the secondary outer layer are compounded with the middle layer through hot rolling; the stainless steel composite plate formed by compositing five layers of base materials not only has a solid structural strength foundation, but also can bear larger mechanical load, and can adapt to a complex corrosive medium environment; the explosive cladding process provides strong interlayer bonding force, so that different material layers are tightly bonded, the layering phenomenon in the using process is prevented, the integrity and the performance stability of the composite board are guaranteed, and the hot rolling process further optimizes the interlayer bonding quality.

Description

Technical Field

[0001] The utility model specifically relates to a multi-layer corrosion-resistant stainless steel composite plate. Background Art

[0002] Stainless steel composite panels are composed of a base layer and a cladding layer. The base layer usually provides high strength and structural support materials, such as carbon steel or low-alloy steel, and its thickness accounts for the majority of the total thickness of the composite panel. The cladding layer is made of stainless steel material and is located on the surface of the composite panel, providing corrosion resistance and aesthetic properties. The thickness of the cladding layer is relatively thin and is generally determined according to specific needs, usually within a few millimeters. Stainless steel composite panels generally have good corrosion resistance and are widely used in industries such as chemical and food processing.

[0003] At present, traditional stainless steel composite plates are usually made of different materials. Different industrial application scenarios have different requirements for the corrosion resistance of materials. For example, in marine engineering, there are high requirements for the corrosion resistance of structural materials. It is necessary to meet the structural strength of marine engineering while being able to effectively resist the erosion of seawater. Traditional stainless steel composite plates are difficult to meet the requirements, which greatly reduces the safety and reliability of marine engineering facilities.

[0004] Therefore, it is necessary to invent a multi-layer corrosion-resistant stainless steel composite plate to solve the above problems. Utility Model Content

[0005] (1) Purpose of the utility model

[0006] In order to solve the technical problems existing in the background technology, the utility model proposes a multi-layer corrosion-resistant stainless steel composite plate with good corrosion resistance.

[0007] (2) Technical solution

[0008] In order to achieve the above object, the utility model provides the following technical solution: a multi-layer corrosion-resistant stainless steel composite plate, comprising a base layer, a primary protective inner layer provided on the base layer, a middle layer provided on the primary protective inner layer, a secondary outer layer further covering the middle layer, and a covering layer provided on the secondary outer layer;

[0009] The base layer, the primary protective inner layer, the middle layer, the secondary outer layer and the covering layer are arranged in order from bottom to top;

[0010] The base layer and the primary defense inner layer, and the secondary outer layer and the covering layer are composited by explosion, and the primary defense inner layer and the secondary outer layer and the middle layer are composited by hot rolling.

[0011] Preferably, the base layer is Q345R low alloy high strength structural steel, and its yield strength is 345 MPa.

[0012] Preferably, the primary defense inner layer is 304 stainless steel.

[0013] Preferably, the middle layer is Inconel 600 nickel-based alloy.

[0014] Preferably, the secondary outer layer is 316L stainless steel.

[0015] Preferably, the coating is Hastelloy C276.

[0016] Preferably, the contact surfaces of the explosive composite between the base layer and the primary defense inner layer and between the secondary outer layer and the coating layer form a wavy metallurgical bonding area.

[0017] Preferably, the primary defense inner layer and the secondary outer layer are compounded with the middle layer by hot rolling and are hot rolled multiple times.

[0018] Compared with the prior art, the beneficial effects of the above technical solution of the utility model are:

[0019] 1. The stainless steel composite plate of the utility model is made of five layers of base materials. It not only has a solid structural strength foundation and can withstand large mechanical loads, but also can adapt to complex corrosive media environments;

[0020] 2. The utility model provides strong interlayer bonding force through the explosive composite process, so that different material layers are tightly bonded, preventing stratification during use, ensuring the integrity and performance stability of the composite plate, and the hot rolling process further optimizes the interlayer bonding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the present utility model;

[0024] Figure 3 This is a schematic diagram of a partial connection surface structure of the utility model.

[0025] Description of reference numerals:

[0026] 1. Base layer; 2. Primary defense inner layer; 3. Middle layer; 4. Secondary outer layer; 5. Covering layer; 6. Metallurgical bonding area. 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 will be further described in detail below with reference to the accompanying drawings.

[0028] The utility model provides Figure 1-3 The multi-layer corrosion-resistant stainless steel composite plate shown in the figure comprises a base layer 1, a primary protective inner layer 2 is provided on the base layer 1, a middle layer 3 is provided on the primary protective inner layer 2, the middle layer 3 is further covered with a secondary outer layer 4, and a covering layer 5 is provided on the secondary outer layer 4;

[0029] Specifically, the base layer 1, the primary protective inner layer 2, the middle layer 3, the secondary outer layer 4 and the covering layer 5 are arranged in order from bottom to top;

[0030] Specifically, the base layer 1 and the primary defense inner layer 2 as well as the secondary outer layer 4 and the covering layer 5 are composited by explosion, and the primary defense inner layer 2 as well as the secondary outer layer 4 and the middle layer 3 are composited by hot rolling.

[0031] In this example, the base layer (Q345R) and the second layer (304 stainless steel), as well as the fourth layer (316L stainless steel) and the cladding layer (Hastelloy C-276), were explosively laminated. During the lamination process, the high-pressure pulse energy generated by the explosive detonation caused the cladding layer to impact the base layer at high speed. Under the instantaneous high temperature and pressure, a strong metallurgical bond was formed between the atoms at the interface of the two materials.

[0032] In this embodiment, after the slabs (layers 1-2, 4-5) that have been initially bonded by explosive cladding are combined with the third layer (Inconel 600) in the middle, they are heated to a suitable hot rolling temperature range (e.g., 1000-1200°C) and then subjected to multiple hot rolling passes on a hot rolling mill.

[0033] Specifically, the base layer 1 is Q345R low alloy high strength structural steel, and its yield strength is 345 MPa.

[0034] In this embodiment, Q345R low-alloy, high-strength structural steel offers high strength and good toughness, with a yield strength of approximately 345 MPa. This provides the overall structural strength of the composite plate, allowing it to withstand significant external forces without deformation or fracture. Furthermore, its relatively low cost makes it suitable as the base material for the composite plate.

[0035] Specifically, the primary defense inner layer 2 is 304 stainless steel.

[0036] In this embodiment, 304 stainless steel contains 18% chromium and 8% nickel, and has excellent corrosion resistance, particularly to air, water, and common chemical media. It also has good processability and can maintain stable performance in a variety of environments, providing a preliminary corrosion-resistant protective layer for the composite plate.

[0037] Specifically, the middle layer 3 is Inconel 600 nickel-based alloy.

[0038] In this embodiment, Inconel 600 alloy exhibits excellent high-temperature corrosion resistance and performs exceptionally well in high-temperature and highly corrosive environments (e.g., those containing both oxidizing and reducing media). It also exhibits excellent oxidation resistance and thermal fatigue resistance, enabling it to protect the internal structure of the composite plate in complex corrosive environments.

[0039] Specifically, the secondary outer layer 4 is made of 316L stainless steel.

[0040] In this embodiment, 316L stainless steel adds molybdenum element on the basis of 304 stainless steel, and its corrosion resistance is further improved, especially it has better tolerance to highly corrosive media such as chloride ions, and can effectively prevent corrosion in marine environments or industrial environments containing chloride ions.

[0041] Specifically, the coating 5 is Hastelloy C276.

[0042] In this embodiment, Hastelloy C-276 is a nickel-molybdenum-chromium alloy with extremely excellent corrosion resistance. It can resist corrosion from various strong acids (such as hydrochloric acid, sulfuric acid, nitric acid, etc.), strong alkalis, and high temperatures. It is the outermost layer to ensure the corrosion resistance of the entire composite plate.

[0043] Specifically, the contact surfaces between the base layer 1 and the primary defense inner layer 2 and between the secondary outer layer 4 and the covering layer 5 are explosively composited to form a wavy metallurgical bonding area 6 .

[0044] In this embodiment, a wavy metallurgical bonding zone is formed at the contact interface. This zone consists of a direct bonding zone, a vortex zone, and a melt layer. The direct bonding zone is where atoms directly bond, the vortex zone is a vortex-like structure formed by the violent flow of the material, and the melt layer is formed by localized melting and rapid solidification at the high temperature of the explosion. These zones work together to ensure a strong initial bond between the two layers.

[0045] Specifically, the primary defense inner layer 2 and the secondary outer layer 4 are compounded with the middle layer 3 by hot rolling, and are hot rolled multiple times.

[0046] In this embodiment, parameters such as reduction, rolling speed, and rolling temperature are strictly controlled during the rolling process. During hot rolling, the layers undergo plastic deformation at high temperatures, further compacting and expanding the interface formed by explosive bonding. Atomic diffusion is enhanced at the interface between the layers, forming a more continuous and uniform metallurgical bond, eliminating any potential microscopic pores and defects and improving bond strength.

[0047] In this embodiment, the five-layer composite plate, after hot-rolling and lamination, is subjected to diffusion annealing. The annealing temperature is determined based on the characteristics of each layer's material, such as 800-1000°C. The holding time is determined by the thickness of the composite plate, typically one hour per 25mm of thickness, followed by furnace cooling.

[0048] During the diffusion annealing process, the stress inside the composite plate is released, and the atomic diffusion between the layers of material continues. At a lower temperature, the thermal motion of the atoms makes the composition at the interface more uniform, further strengthening the metallurgical bond. This bonding method makes it less likely for the composite plate to delaminate between the layers during long-term use, ensuring the overall performance of the composite plate.

[0049] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A multi-layer corrosion-resistant stainless steel composite plate, characterized by: The invention comprises a base layer (1), a primary defense inner layer (2) is provided on the base layer (1), a middle layer (3) is provided on the primary defense inner layer (2), a secondary outer layer (4) is covered on the middle layer (3), and a covering layer (5) is provided on the secondary outer layer (4); The base layer (1), the primary protective inner layer (2), the middle layer (3), the secondary outer layer (4) and the covering layer (5) are arranged in order from bottom to top; The base layer (1) and the primary defense inner layer (2) and the secondary outer layer (4) and the coating (5) are composited by explosion, and the primary defense inner layer (2) and the secondary outer layer (4) and the middle layer (3) are composited by hot rolling.

2. The multi-layer corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The base layer (1) is Q345R low alloy high strength structural steel, and its yield strength is 345 MPa.

3. The multi-layer corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The primary protective inner layer (2) is made of 304 stainless steel.

4. The multi-layer corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The middle layer (3) is Inconel 600 nickel-based alloy.

5. The multi-layer corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The secondary outer layer (4) is 316L stainless steel.

6. The multi-layer corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The coating (5) is Hastelloy C276.

7. The multi-layer corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The contact surfaces of the base layer (1) and the primary defense inner layer (2) and the secondary outer layer (4) and the coating (5) are explosively composited to form a wavy metallurgical bonding area (6).

8. The multi-layer corrosion-resistant stainless steel composite plate according to claim 1, characterized in that: The primary defense inner layer (2), the secondary outer layer (4) and the middle layer (3) are composited by hot rolling and undergo multiple hot rolling processes.

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