220BH cold-rolled bake-hardened high-strength steel for automobile
By introducing multi-layer structures and composite materials into the steel, the problem of insufficient strength of 220BH cold-rolled bake-hardening steel was solved, achieving high strength and high plasticity of the steel, avoiding fracture, and improving safety and corrosion resistance.
Patent Information
- Application Number
- CN202510940983.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-09
- Publication Date
- 2025-11-21
AI Technical Summary
The existing 220BH cold-rolled bake-hardening steel has insufficient strength and is prone to fracture, posing a safety hazard.
By introducing a multi-layered structure into the steel, including a first cold-rolled steel body, an aluminum strip layer, a second cold-rolled steel body, and various adhesive layers, galvanized layers, reinforcing structures, protective structures, and anti-corrosion structures, and using continuous annealing process and high-temperature extrusion technology, a composite material is formed, which improves the strength and stability of the steel.
It enhances the stamping formability and plasticity of steel, improves the overall strength of steel, avoids fracture, and enhances safety and corrosion resistance.
Smart Images
Figure CN120986007A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cold-rolled steel technology, and more particularly to a 220BH cold-rolled bake-hardening high-strength steel for automobiles. Background Technology
[0002] Currently, steel accounts for the largest proportion of the raw materials used in automobile manufacturing, about two-thirds. One of the most commonly used steel plates in automobiles is bake-hardened steel plate, abbreviated as BH steel. It is made by adding micro-alloying elements such as Nb and Ti to low-carbon steel or ultra-low-carbon steel. 220BH cold-rolled bake-hardened steel is one type of BH steel. However, the existing 220BH cold-rolled bake-hardened steel is not strong enough and is prone to breakage, which poses a safety hazard when applied to automobiles. Summary of the Invention
[0003] The purpose of this invention is to provide a 220BH cold-rolled bake-hardening high-strength steel for automobiles, aiming to solve the problem of insufficient strength of existing 220BH cold-rolled bake-hardening steel.
[0004] To achieve the above objectives, the present invention provides a 220BH cold-rolled bake-hardening high-strength steel for automobiles, comprising a first cold-rolled steel body, a first adhesive layer, an aluminum strip layer, a second adhesive layer, and a second cold-rolled steel body;
[0005] The first adhesive layer is connected to the first cold-rolled steel body and is located on one side of the first cold-rolled steel body; the aluminum strip layer is connected to the first adhesive layer and is located on the side of the first adhesive layer away from the first cold-rolled steel body; the second adhesive layer is connected to the aluminum strip layer and is located on the side of the aluminum strip layer away from the first adhesive layer; the second cold-rolled steel body is connected to the second adhesive layer and is located on the side of the second adhesive layer away from the aluminum strip layer.
[0006] The 220BH cold-rolled bake-hardening high-strength steel for automobiles also includes a second galvanized layer; the second galvanized layer is connected to the second cold-rolled steel body and is located on the side of the second cold-rolled steel body away from the aluminum strip layer.
[0007] The 220BH cold-rolled bake-hardening high-strength steel for automobiles further includes a reinforcing structure, a protective structure, and an anti-corrosion structure; the reinforcing structure is disposed on the side of the first cold-rolled steel body away from the aluminum strip layer, the protective structure is disposed on the side of the reinforcing structure away from the first cold-rolled steel body, and the anti-corrosion structure is disposed on the side of the protective structure away from the reinforcing structure.
[0008] The protective structure includes a sound insulation layer and a waterproof layer; the sound insulation layer is disposed on the side of the reinforcing structure away from the first cold-rolled steel body; the waterproof layer and the sound insulation layer are connected and located on the side of the sound insulation layer away from the reinforcing structure.
[0009] The anti-corrosion structure includes a first galvanized layer and a phosphate layer; the first galvanized layer is connected to the waterproof layer and is located on the side of the waterproof layer away from the sound insulation layer; the phosphate layer is connected to the first galvanized layer and is located on the side of the first galvanized layer away from the waterproof layer.
[0010] The anti-corrosion structure further includes a base coating and a printing layer; the base coating is connected to the phosphate layer and is located on the side of the phosphate layer away from the first zinc plating layer; the printing layer is connected to the base coating and is located on the side of the base coating away from the phosphate layer.
[0011] The anti-corrosion structure further includes a top coating layer; the top coating layer is connected to the printed layer and is located on the side of the printed layer away from the base coating layer.
[0012] This invention discloses a 220BH cold-rolled bake-hardening high-strength steel for automobiles. The chemical composition of the first and second cold-rolled steel bodies is as follows: C 0.0015–0.0025; Si ≤0.05; Mn 0.40–0.60; P 0.040–0.065; S ≤0.015; Al 0.02–0.06; Nb 0.008–0.020; Cr The alloy composition is 0.05–0.10; Mo ≤ 0.05; the remainder is Fe. It is produced by continuous annealing process and has excellent stamping formability, plasticity, and low yield strength. The first adhesive layer is used to firmly bond the first cold-rolled steel body and the aluminum strip layer together, and the second adhesive layer is used to firmly bond the aluminum strip layer and the second cold-rolled steel body together. Through the combination of the first cold-rolled steel body, the aluminum strip layer, and the second cold-rolled steel body, the strength of the steel is increased, and the steel fracture is prevented, making it safer when applied to automobiles. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a schematic diagram of the structure of a 220BH cold-rolled bake-hardening high-strength steel for automobiles according to the present invention.
[0015] Figure 2 This is a schematic diagram of the reinforcing structure of the present invention.
[0016] Figure 3This is a schematic diagram of the protective structure of the present invention.
[0017] Figure 4 This is a schematic diagram of the anti-corrosion structure of the present invention.
[0018] 1-First cold-rolled steel body, 2-First adhesive layer, 3-Aluminum strip layer, 4-Second adhesive layer, 5-Second cold-rolled steel body, 6-Second galvanized layer, 7-Reinforcing structure, 8-Protective structure, 9-Anti-corrosion structure, 71-Manganese steel layer, 72-Elastic steel layer, 73-Carbon steel layer, 81-Sound insulation layer, 82-Waterproof layer, 91-First galvanized layer, 92-Phosphating layer, 93-Primer coating, 94-Printing layer, 95-Topcoat coating. Detailed Implementation
[0019] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0020] Please see Figure 1 The present invention provides a 220BH cold-rolled bake-hardening high-strength steel for automobiles: comprising a first cold-rolled steel body 1, a first adhesive layer 2, an aluminum strip layer 3, a second adhesive layer 4, and a second cold-rolled steel body 5;
[0021] The first adhesive layer 2 is connected to the first cold-rolled steel body 1 and is located on one side of the first cold-rolled steel body 1; the aluminum strip layer 3 is connected to the first adhesive layer 2 and is located on the side of the first adhesive layer 2 away from the first cold-rolled steel body 1; the second adhesive layer 4 is connected to the aluminum strip layer 3 and is located on the side of the aluminum strip layer 3 away from the first adhesive layer 2; the second cold-rolled steel body 5 is connected to the second adhesive layer 4 and is located on the side of the second adhesive layer 4 away from the aluminum strip layer 3.
[0022] In this embodiment, the chemical composition of the first cold-rolled steel body 1 and the second cold-rolled steel body 5 are as follows: C 0.0015~0.0025; Si≤0.05; Mn 0.40~0.60; P 0.040~0.065; S≤0.015; Als 0.02~0.06; Nb 0.008~0.020; Cr 0.05~0.10; Mo≤0.05; the remainder is Fe, obtained by continuous annealing process, has excellent stamping formability, plasticity, and low yield strength; the first adhesive layer 2 is used to firmly bond the first cold-rolled steel body 1 and the aluminum strip layer 3 together, and the second adhesive layer 4 is used to firmly bond the aluminum strip layer 3 and the second cold-rolled steel body 5 together. Through the combination of the first cold-rolled steel body 1, the aluminum strip layer 3 and the second cold-rolled steel body 5, the strength of the steel is increased, the steel fracture is prevented, and it is safer when applied to automobiles.
[0023] For further details, please refer to Figure 1 The 220BH cold-rolled bake-hardening high-strength steel for automobiles also includes a second galvanized layer 6; the second galvanized layer 6 is connected to the second cold-rolled steel body 5 and is located on the side of the second cold-rolled steel body 5 away from the aluminum strip layer 3.
[0024] In this embodiment, the second galvanized layer 6 can improve the oxidation resistance of the second cold-rolled steel body 5.
[0025] For further details, please refer to Figure 1 The 220BH cold-rolled bake-hardening high-strength steel for automobiles also includes a reinforcing structure 7, a protective structure 8, and an anti-corrosion structure 9; the reinforcing structure 7 is disposed on the side of the first cold-rolled steel body 1 away from the aluminum strip layer 3, the protective structure 8 is disposed on the side of the reinforcing structure 7 away from the first cold-rolled steel body 1, and the anti-corrosion structure 9 is disposed on the side of the protective structure 8 away from the reinforcing structure 7.
[0026] In this embodiment, the reinforcing structure 7 is used to enhance the overall strength of the steel, the protective structure 8 is used to improve the waterproof and sound insulation effects, and the anti-corrosion structure 9 is used to improve the anti-corrosion performance of the protective structure 8.
[0027] For further details, please refer to Figure 3 The protective structure 8 includes a sound insulation layer 81 and a waterproof layer 82; the sound insulation layer 81 is disposed on the side of the reinforcing structure 7 away from the first cold-rolled steel body 1; the waterproof layer 82 is connected to the sound insulation layer 81 and is located on the side of the sound insulation layer 81 away from the reinforcing structure 7.
[0028] In this embodiment, the sound insulation layer 81 is made of sound-absorbing fiber cotton, which has a good sound insulation effect, so that the steel has a good sound insulation effect when applied to the vehicle; the waterproof layer 82 is made of waterproof material, so that the steel has a good waterproof effect when applied to the vehicle. The first adhesive layer 2 is used to firmly bond the first cold-rolled steel body 1 and the aluminum strip layer 3 together, and the second adhesive layer 4 is used to firmly bond the aluminum strip layer 3 and the second cold-rolled steel body 5 together. Through the combination of the first cold-rolled steel body 1, the aluminum strip layer 3 and the second cold-rolled steel body 5, the strength of the steel is increased, preventing the steel from breaking, and making it safer when applied to automobiles.
[0029] For further details, please refer to Figure 4 The anti-corrosion structure 9 includes a first galvanized layer 91 and a phosphate layer 92; the first galvanized layer 91 is connected to the waterproof layer 82 and is located on the side of the waterproof layer 82 away from the sound insulation layer 81; the phosphate layer 92 is connected to the first galvanized layer 91 and is located on the side of the first galvanized layer 91 away from the waterproof layer 82.
[0030] In this embodiment, the first zinc plating layer 91 can improve the oxidation resistance of the steel, and the phosphating layer 92 can improve the corrosion resistance and rust prevention performance.
[0031] For further details, please refer to Figure 4 The anti-corrosion structure 9 further includes a base coating layer 93 and a printing layer 94; the base coating layer 93 is connected to the phosphate layer 92 and is located on the side of the phosphate layer 92 away from the first zinc plating layer 91; the printing layer 94 is connected to the base coating layer 93 and is located on the side of the base coating layer 93 away from the phosphate layer 92.
[0032] In this embodiment, a polyurethane primer is used, and a polyvinylidene fluoride topcoat is used for the topcoat 95, which improves rust resistance and makes the steel less prone to discoloration. The first adhesive layer 2 is used to firmly bond the first cold-rolled steel body 1 and the aluminum strip layer 3 together, and the second adhesive layer 4 is used to firmly bond the aluminum strip layer 3 and the second cold-rolled steel body 5 together. Through the combination of the first cold-rolled steel body 1, the aluminum strip layer 3, and the second cold-rolled steel body 5, the strength of the steel is increased, preventing the steel from breaking, and making it safer when applied to automobiles.
[0033] Furthermore, the anti-corrosion structure 9 also includes a top coating 95; the top coating 95 is connected to the printed layer 94 and is located on the side of the printed layer 94 away from the base coating 93.
[0034] In this embodiment, the topcoat 95 is made of polyvinylidene fluoride topcoat, which improves rust prevention and makes the steel less prone to discoloration.
[0035] For further details, please refer to Figure 2 The reinforcing structure 7 includes a manganese steel layer 71 and an elastic steel layer 72; the manganese steel layer 71 is connected to the first cold-rolled steel body 1 and is located on the side of the first cold-rolled steel body 1 away from the first adhesive layer 2; the elastic steel layer 72 is connected to the manganese steel layer 71 and is located on the side of the manganese steel layer 71 away from the first cold-rolled steel body 1.
[0036] In this embodiment, the first cold-rolled steel body 1, the manganese steel layer 71, and the elastic steel layer 72 are all integrally formed by high-temperature extrusion, which increases the structural stability of the first cold-rolled steel body 1, the manganese steel layer 71, and the elastic steel, and makes the steel stronger.
[0037] For further details, please refer to Figure 2 The reinforcing structure 7 further includes a carbon steel layer 73; the carbon steel layer 73 is connected to the elastic steel layer 72 and the sound insulation layer 81 respectively, and is located between the elastic steel layer 72 and the sound insulation layer 81.
[0038] In this embodiment, the first cold-rolled steel body 1, the manganese steel layer 71, the elastic steel layer 72, and the carbon steel layer 73 are all integrally formed by high-temperature extrusion, increasing the structural stability of the first cold-rolled steel body 1, the manganese steel layer 71, the elastic steel, and the carbon steel layer 73, thus increasing the strength of the steel. The first adhesive layer 2 is used to firmly bond the first cold-rolled steel body 1 and the aluminum strip layer 3 together, and the second adhesive layer 4 is used to firmly bond the aluminum strip layer 3 and the second cold-rolled steel body 5 together. Through the combination of the first cold-rolled steel body 1, the aluminum strip layer 3, and the second cold-rolled steel body 5, the strength of the steel is increased, preventing steel breakage and making it safer when applied to automobiles.
[0039] The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.
Claims
1. A cold-rolled, bake-hardening high-strength steel for automobiles, characterized in that, It includes a first cold-rolled steel body, a first adhesive layer, an aluminum strip layer, a second adhesive layer, and a second cold-rolled steel body; The first adhesive layer is connected to the first cold-rolled steel body and is located on one side of the first cold-rolled steel body; the aluminum strip layer is connected to the first adhesive layer and is located on the side of the first adhesive layer away from the first cold-rolled steel body; the second adhesive layer is connected to the aluminum strip layer and is located on the side of the aluminum strip layer away from the first adhesive layer; the second cold-rolled steel body is connected to the second adhesive layer and is located on the side of the second adhesive layer away from the aluminum strip layer.
2. The 220BH cold-rolled bake-hardening high-strength steel for automobiles as described in claim 1, characterized in that, The 220BH cold-rolled bake-hardening high-strength steel for automobiles also includes a second galvanized layer; the second galvanized layer is connected to the second cold-rolled steel body and is located on the side of the second cold-rolled steel body away from the aluminum strip layer.
3. The 220BH cold-rolled bake-hardening high-strength steel for automobiles as described in claim 1, characterized in that, The 220BH cold-rolled bake-hardening high-strength steel for automobiles also includes a reinforcing structure, a protective structure, and an anti-corrosion structure; the reinforcing structure is disposed on the side of the first cold-rolled steel body away from the aluminum strip layer, the protective structure is disposed on the side of the reinforcing structure away from the first cold-rolled steel body, and the anti-corrosion structure is disposed on the side of the protective structure away from the reinforcing structure.
4. The 220BH cold-rolled bake-hardening high-strength steel for automobiles as described in claim 3, characterized in that, The protective structure includes a sound insulation layer and a waterproof layer; the sound insulation layer is disposed on the side of the reinforcing structure away from the first cold-rolled steel body; the waterproof layer and the sound insulation layer are connected and located on the side of the sound insulation layer away from the reinforcing structure.
5. The 220BH cold-rolled bake-hardening high-strength steel for automobiles as described in claim 3, characterized in that, The anti-corrosion structure includes a first galvanized layer and a phosphate layer; the first galvanized layer is connected to the waterproof layer and is located on the side of the waterproof layer away from the sound insulation layer; the phosphate layer is connected to the first galvanized layer and is located on the side of the first galvanized layer away from the waterproof layer.
6. The 220BH cold-rolled bake-hardening high-strength steel for automobiles as described in claim 5, characterized in that, The anti-corrosion structure further includes a base coating and a printing layer; the base coating and the phosphate layer are connected and located on the side of the phosphate layer away from the first zinc plating layer; the printing layer and the base coating are connected and located on the side of the base coating away from the phosphate layer.
7. The 220BH cold-rolled bake-hardening high-strength steel for automobiles as described in claim 6, characterized in that, The anti-corrosion structure also includes a top coating layer; the top coating layer is connected to the printed layer and is located on the side of the printed layer away from the base coating layer.