Low-alloy high-strength cold-rolled steel strip for automobiles

Abstract

The utility model relates to cold-rolled steel strip technical field, concretely relates to low alloy high strength cold-rolled steel strip for automobile, including base tape layer, transition joint layer and corrosion -resistant surface layer, transition joint layer is compounded in the upper and lower surface of base tape layer, corrosion -resistant surface layer is compounded in the one side of transition joint layer away from base tape layer, forms three -layer composite structure, the upper and lower surface of base tape layer is evenly provided with a plurality of through -hole, and the part material of transition joint layer is embedded in the through -hole, forms the inlayed connection structure, the outer surface of corrosion -resistant surface layer is equipped with a plurality of parallel distribution's strip-shaped convex edge, and strip-shaped convex edge extends along the length direction of cold-rolled steel strip, adopts the three -layer composite structure of " base tape layer - transition joint layer - corrosion -resistant surface layer", and sets up through -hole in base tape layer, makes transition joint layer material embeds the through -hole and forms the inlayed connection, and the interlayer adhesion is greatly promoted, effectively avoids the problem that the coating falls off in the use process, and the structural stability is stronger.

Description

Technical Field

[0001] This utility model relates to the field of cold-rolled steel strip technology, specifically to low-alloy high-strength cold-rolled steel strip for automobiles. Background Technology

[0002] With the rapid development of the automotive industry, the requirements for lightweight, safety, and economy in automobiles are increasing. Cold-rolled steel strip, as a key material in automobile manufacturing, is widely used in core parts such as body structural components and chassis components. Its strength, toughness, corrosion resistance, and other properties directly affect the overall quality of the automobile.

[0003] Existing automotive cold-rolled steel strips are mostly single-layered structures with simple surface protection, making them prone to corrosion in harsh environments such as humid and salt spray conditions. Furthermore, the interlayer bonding is poor, and long-term use can lead to coating peeling. At the same time, the surface morphology design of conventional cold-rolled steel strips is unreasonable, resulting in poor adhesion and formability during subsequent processing, making it difficult to meet the manufacturing requirements of complex automotive parts. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a low-alloy high-strength cold-rolled steel strip for automobiles, which can effectively solve the problems in the existing technology.

[0005] This utility model provides a low-alloy high-strength cold-rolled steel strip for automobiles, comprising a base layer, a transition bonding layer, and a corrosion-resistant surface layer. The transition bonding layer is laminated on the upper and lower surfaces of the base layer, and the corrosion-resistant surface layer is laminated on the side of the transition bonding layer away from the base layer, forming a three-layer composite structure. The base layer has a plurality of through holes uniformly formed through the upper and lower surfaces, and a portion of the material of the transition bonding layer is embedded in the through holes to form an interlocking connection structure. The outer surface of the corrosion-resistant surface layer has a plurality of parallel strip-shaped protrusions extending along the length direction of the cold-rolled steel strip.

[0006] Furthermore, the through holes are arranged in an array, with a center-to-center distance of 5-15 mm between adjacent through holes, a diameter of 0.5-2 mm, and a number of 2-5 through holes per square centimeter.

[0007] Furthermore, the cross-section of the strip-shaped protrusion is semi-circular, and the height of the protrusion is 0.1-0.3mm, with a spacing of 1-3mm between adjacent protrusions.

[0008] Furthermore, the thickness of the transition bonding layer is 0.5-2μm, and both sides of the transition bonding layer are integrally fixed with protruding structures; the thickness of the corrosion-resistant surface layer is 5-15μm; the thickness of the base layer is 0.8-3.0mm; and the total thickness of the entire cold-rolled steel strip is 0.81-3.03mm.

[0009] Furthermore, the edge of the baseband layer is provided with an arc-shaped chamfer with a chamfer radius of 0.2-0.5mm.

[0010] Furthermore, the outer surface of the corrosion-resistant surface layer is provided with several micro-pits, which are evenly distributed between adjacent strip-shaped ridges. The diameter of the pits is 50-100μm and the depth is 10-30μm.

[0011] Compared with existing technologies, the beneficial effects of this invention are as follows: It adopts a three-layer composite structure of "base layer - transition bonding layer - corrosion-resistant surface layer," and through-holes are opened in the base layer, allowing the transition bonding layer material to embed into the through-holes to form a fitted connection. This significantly improves the interlayer bonding force, effectively avoids coating peeling during use, and enhances structural stability. In this device, the strip-shaped ridge structure on the outer surface of the corrosion-resistant layer can increase the contact friction with other components during subsequent processing, while also providing guidance for positioning during processing and improving forming accuracy; the micro-dimples between adjacent ridges can store lubricating medium, further optimizing processing performance.

[0012] In this device, the rounded chamfer design at the edge of the base layer can avoid edge stress concentration, reduce the risk of edge cracking during processing and use, and improve the overall service life of the steel strip; the reasonable matching of the thickness of each layer ensures high strength while taking into account the lightweight requirements of the steel strip. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. 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 this utility model; Figure 2 This is an exploded view of the structure of this utility model.

[0015] The labels in the diagram represent: 1. Base layer; 11. Through hole; 2. Transition bonding layer; 21. Protrusion; 3. Corrosion-resistant surface layer; 31. Strip-shaped protrusion; 32. Pits. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0017] The present invention will be further described below with reference to the embodiments.

[0018] Example: Low-alloy high-strength cold-rolled steel strip for automobiles, see attached document. Figure 1 -Appendix Figure 2 The structure includes a base layer 1, a transition bonding layer 2, and a corrosion-resistant surface layer 3. The transition bonding layer 2 is bonded to the upper and lower surfaces of the base layer 1, and the corrosion-resistant surface layer 3 is bonded to the side of the transition bonding layer 2 away from the base layer 1, forming a three-layer composite structure. The base layer 1 has several through holes 11 that penetrate the upper and lower surfaces evenly. Part of the material of the transition bonding layer 2 is embedded in the through holes 11 to form an interlocking connection structure. The outer surface of the corrosion-resistant surface layer 3 has several parallel strip-shaped protrusions 31 that extend along the length of the cold-rolled steel strip. The through holes 11 are arranged in an array, with a center-to-center spacing of 5-15mm between adjacent through holes 11, a diameter of 0.5-2mm, and a number of 2-5 through holes per square centimeter. The edges of the base layer 1 are provided with arc-shaped chamfers with a chamfer radius of 0.2-0.5mm. A three-layer composite structure of "base layer 1 - transition bonding layer 2 - corrosion-resistant surface layer 3" is adopted, and through holes 11 are opened in the base layer 1, so that the material of the transition bonding layer 2 is embedded in the through holes 11 to form a fitting connection, which greatly improves the interlayer bonding force, effectively avoids the problem of coating peeling off during use, and has stronger structural stability.

[0019] The cross-section of the strip-shaped ridge 31 is semi-circular, and the height of the ridge is 0.1-0.3 mm, with a spacing of 1-3 mm between adjacent ridges. The outer surface of the corrosion-resistant surface layer 3 is also provided with several micro-pits 32, which are evenly distributed between adjacent strip-shaped ridges 31. The diameter of the pits 32 is 50-100 μm, and the depth is 10-30 μm. The strip-shaped ridge 31 structure on the outer surface of the corrosion-resistant surface layer 3 can increase the contact friction with other parts during subsequent processing, and at the same time provide guidance for positioning during processing, thereby improving the forming accuracy. The micro-pits 32 between adjacent ridges can store lubricating medium, further optimizing processing performance.

[0020] The thickness of the transition bonding layer 2 is 0.5-2μm, and both sides of the transition bonding layer 2 are integrally fixed with protrusions 21. The thickness of the corrosion-resistant surface layer 3 is 5-15μm, the thickness of the base layer 1 is 0.8-3.0mm, and the total thickness of the entire cold-rolled steel strip is 0.81-3.03mm. The arc-shaped chamfer design of the edge of the base layer 1 can avoid edge stress concentration, reduce the risk of edge cracking during processing and use, and improve the overall service life of the steel strip. The reasonable matching of the thickness of each layer ensures high strength while taking into account the lightweight requirements of the steel strip.

[0021] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this utility model.

Claims

1. A low-alloy high-strength cold-rolled steel strip for automobiles, characterized in that, The structure includes a base layer (1), a transition bonding layer (2), and a corrosion-resistant surface layer (3). The transition bonding layer (2) is bonded to the upper and lower surfaces of the base layer (1), and the corrosion-resistant surface layer (3) is bonded to the side of the transition bonding layer (2) away from the base layer (1), forming a three-layer composite structure. The base layer (1) is uniformly provided with several through holes (11) penetrating the upper and lower surfaces. Part of the material of the transition bonding layer (2) is embedded in the through holes (11) to form an interlocking connection structure. The outer surface of the corrosion-resistant surface layer (3) is provided with several parallel strip-shaped protrusions (31), which extend along the length direction of the cold-rolled steel strip.

2. The low-alloy high-strength cold-rolled steel strip for automobiles according to claim 1, characterized in that, The through holes (11) are arranged in an array, the center-to-center distance between adjacent through holes (11) is 5-15mm, the diameter of the through holes (11) is 0.5-2mm, and the number of through holes (11) is 2-5 per square centimeter.

3. The low-alloy high-strength cold-rolled steel strip for automobiles according to claim 1, characterized in that, The cross section of the strip-shaped protrusion (31) is semi-circular, and the height of the protrusion is 0.1-0.3mm, and the distance between adjacent protrusions is 1-3mm.

4. The low-alloy high-strength cold-rolled steel strip for automobiles according to claim 1, characterized in that, The thickness of the transition bonding layer (2) is 0.5-2μm, and both sides of the transition bonding layer (2) are integrally fixed with a protrusion (21) structure. The thickness of the corrosion resistant surface layer (3) is 5-15μm, the thickness of the base layer (1) is 0.8-3.0mm, and the total thickness of the entire cold-rolled steel strip is 0.81-3.03mm.

5. The low-alloy high-strength cold-rolled steel strip for automobiles according to claim 4, characterized in that, The baseband layer (1) has an arc-shaped chamfer at its edge with a chamfer radius of 0.2-0.5 mm.

6. The low-alloy high-strength cold-rolled steel strip for automobiles according to claim 1, characterized in that, The outer surface of the corrosion-resistant surface layer (3) is also provided with a number of micro-pits (32). The micro-pits (32) are evenly distributed between adjacent strip-shaped protrusions (31). The diameter of the pits (32) is 50-100μm and the depth is 10-30μm.

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