A light-weight high-strength steel-aluminum composite product

Abstract

The utility model relates to a kind of steel-aluminum composite products of light high strength, relate to steel-aluminum composite product field.The steel-aluminum composite product includes built-in thin-walled steel pipe assembly and the aluminum alloy layer integrally casted at the periphery of the thin-walled steel pipe assembly;The thin-walled steel pipe assembly includes thin-walled steel pipe and structural member, and the thin-walled steel pipe is fixed on the structural member.The steel-aluminum composite product manufactured by the utility model has the performance of light weight and high strength.

Description

Technical Field

[0001] This utility model relates to the field of steel-aluminum composite products, specifically to a lightweight and high-strength steel-aluminum composite product. Background Technology

[0002] With the development of society, economy, and technology, the demand for lightweight, high-strength composite materials and products is increasing daily, especially in fields such as aircraft, ships, new energy, high-speed rail, passenger and freight vehicles. These fields require materials or components to possess both lightweight and high-strength properties.

[0003] In the field of lightweight metallic materials, aluminum and its alloys are generally the first choice for the following reasons: firstly, aluminum is abundant and inexpensive on Earth; secondly, aluminum production is high; and thirdly, aluminum alloys have low density and excellent properties. In the field of high-strength metallic materials, steel is the preferred choice due to its low cost and abundance. Therefore, this utility model provides a lightweight, high-strength steel-aluminum composite product. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a lightweight and high-strength steel-aluminum composite product. The objective is to provide a lightweight and high-strength steel-aluminum composite product.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: In a first aspect, a lightweight, high-strength steel-aluminum composite product is provided. The steel-aluminum composite product includes a built-in thin-walled steel tube assembly and an integrally cast aluminum alloy layer surrounding the thin-walled steel tube assembly. The thin-walled steel tube assembly includes a thin-walled steel tube and a structural component, with the thin-walled steel tube fixed to the structural component. The thin-walled steel tube assembly is installed in a product mold, and the outer surface of the thin-walled steel tube assembly is integrally cast with an aluminum alloy layer, resulting in a lightweight, high-strength steel-aluminum composite product.

[0006] The beneficial effects of this utility model are: the steel-aluminum composite products manufactured by this utility model have lightweight and high strength properties; compared with the prior art, it fully utilizes the comprehensive properties of high strength, lightweight, and corrosion resistance of the steel-aluminum composite products after the thin-walled steel pipe and aluminum alloy layer are combined, and the density of the composite can reach 1g / cm³. 3 The following avoids the defects of single-piece buckling and instability of single materials, the poor corrosion resistance of single-material thin-walled steel pipes, and the poor impact resistance of single-material aluminum alloys.

[0007] For example, using square steel pipes with a wall thickness of 25 mm × 25 mm × 0.4 mm, a gap of 1 mm between the steel pipes, and a gap of 1 mm between the six sides of the thin-walled steel pipe assembly and the inner wall of the mold, 40 steel pipes with a length of 1000 mm were used to manufacture a volume of 28163 cm³. 3This lightweight, high-strength steel-aluminum composite product weighs only 20937.4 g and has a bulk density of 0.743 g / cm³. 3 High strength, meaning its strength is far greater than the sum of the strengths of single-material steel pipes and aluminum alloy pipes of the same cross-section and quantity.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the thin-walled steel pipe has closed structures at both ends; the thin-walled steel pipe includes at least two thin-walled steel pipes, and adjacent thin-walled steel pipes are fixed to the structural member at intervals.

[0010] Furthermore, the thin-walled steel pipe is a steel pipe with an outer diameter to wall thickness ratio greater than 20.

[0011] Furthermore, the cross-sectional shape of the thin-walled steel pipe is any one or a combination of at least two of the following: rectangular, circular, elliptical, parallelogram, trapezoid, and triangle. The parallelogram includes rhombuses, etc.

[0012] The specifications of the thin-walled steel pipes include square steel pipes of 40 mm × 40 mm × 0.5 mm, round steel pipes of Ø100 mm × 1 mm, rectangular steel pipes of 50 mm × 20 mm × 0.6 mm, equilateral triangular steel pipes with a height of 80 mm, etc.

[0013] Furthermore, the steel-aluminum composite product includes any one of the following: ship-shaped steel-aluminum composite product, flat steel-aluminum composite product, U-shaped steel-aluminum composite product, and trapezoidal steel-aluminum composite product.

[0014] Furthermore, the ship-shaped steel-aluminum composite product includes a first raised portion, a horizontal portion, and a second raised portion; the first raised portion, the horizontal portion, and the second raised portion are connected in sequence, and are integrally formed into a ship-shaped steel-aluminum composite product by casting an aluminum alloy layer around the ship-shaped thin-walled steel pipe assembly.

[0015] Furthermore, the included angle between the first raised portion and the horizontal portion is the same as the included angle between the second raised portion and the horizontal portion, and the included angle is less than 180°.

[0016] Furthermore, the flat steel-aluminum composite product is integrally formed by casting an aluminum alloy layer around the flat thin-walled steel tube assembly; the flat thin-walled steel tube assembly is arranged from top to bottom as follows: a thin-walled steel tube with a triangular cross-section, a thin-walled steel tube with a circular cross-section, and a thin-walled steel tube with a triangular cross-section.

[0017] Furthermore, the U-shaped high-strength steel-aluminum composite product is integrally formed by casting an aluminum alloy layer around a U-shaped thin-walled steel tube assembly; the U-shaped thin-walled steel tube assembly consists of U-shaped thin-walled steel tubes arranged at intervals.

[0018] Furthermore, the trapezoidal steel-aluminum composite product is integrally formed by casting an aluminum alloy layer around a thin-walled steel tube assembly on a trapezoidal flat plate; the trapezoidal thin-walled steel tube assembly has thin-walled steel tubes spaced apart. Attached Figure Description

[0019] Figure 1 A process flow diagram for manufacturing lightweight, high-strength steel-aluminum composite products according to this utility model; Figure 2 A cross-sectional view of the lightweight, high-strength, boat-shaped steel-aluminum composite product with upturned ends manufactured according to this utility model. Figure 3 This is a schematic diagram of the combination of thin-walled steel pipe and transverse structural components in the lightweight, high-strength, two-end-curved boat-shaped steel-aluminum composite product manufactured according to this utility model.

[0020] Figure 4 This is a cross-sectional view of the lightweight, high-strength flat steel-aluminum composite product manufactured according to this utility model.

[0021] Figure 5 This is a longitudinal cross-sectional view of the lightweight, high-strength U-shaped steel-aluminum composite product manufactured according to this utility model.

[0022] Figure 6 This is a cross-sectional view of the lightweight, high-strength, trapezoidal-shaped flat steel-aluminum composite product manufactured according to this utility model.

[0023] The attached diagram lists the components represented by each number as follows: 1. Aluminum alloy layer; 2. Thin-walled steel pipe; 3. Structural components. Detailed Implementation

[0024] The principles and features of this utility model are described below. The examples given are only for explaining this utility model and are not intended to limit its scope. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0025] This embodiment relates to a lightweight, high-strength steel-aluminum composite product, which includes a built-in thin-walled steel pipe assembly and an integrally cast aluminum alloy layer 1 surrounding the thin-walled steel pipe assembly; the thin-walled steel pipe assembly includes a thin-walled steel pipe 2 and a structural component 3, wherein the thin-walled steel pipe 2 is fixed to the structural component 3.

[0026] The steel-aluminum composite product manufactured in this embodiment possesses both lightweight and high strength properties. Compared with existing technologies, it fully leverages the comprehensive properties of the steel-aluminum composite product, such as high strength, lightweight, and corrosion resistance, after the thin-walled steel pipe 2 and aluminum alloy layer 1 are combined. The density of the assembly can reach 1 g / cm³. 3 The following avoids the defects of single-piece buckling and instability of single materials, the poor corrosion resistance of single-material thin-walled steel pipes, and the poor impact resistance of single-material aluminum alloys.

[0027] For example, using square steel pipes with a wall thickness of 25 mm × 25 mm × 0.4 mm, a gap of 1 mm between the steel pipes, and a gap of 1 mm between the six sides of the thin-walled steel pipe assembly and the inner wall of the mold, 40 steel pipes with a length of 1000 mm were used to manufacture a volume of 28163 cm³. 3 This lightweight, high-strength steel-aluminum composite product weighs only 20937.4 g and has a bulk density of 0.743 g / cm³. 3 High strength, meaning its strength is far greater than the sum of the strengths of single-material steel pipes and aluminum alloy pipes of the same cross-section and quantity.

[0028] The thin-walled steel pipe 2 is a steel pipe with an outer diameter to wall thickness ratio greater than 20.

[0029] Preferably, the thin-walled steel pipe 2 in this embodiment has closed structures at both ends. The thin-walled steel pipe 2 includes at least two thin-walled steel pipes 2, and adjacent thin-walled steel pipes 2 are fixed to the structural member 3 at intervals.

[0030] Preferably, the aluminum alloy in this embodiment includes at least one of aluminum-copper alloy, aluminum-manganese alloy, aluminum-silicon alloy, aluminum-magnesium alloy, aluminum-magnesium-silicon alloy, and aluminum-zinc alloy.

[0031] Preferably, the cross-sectional shape of the thin-walled steel pipe 2 in this embodiment includes any one of triangle, circle, parallelogram, and trapezoid. The parallelogram includes rectangle, rhombus, etc.

[0032] The specifications of the thin-walled steel pipe 2 include square steel pipes of 40 mm × 40 mm × 0.5 mm, round steel pipes of Ø100 mm × 1 mm, rectangular steel pipes of 50 mm × 20 mm × 0.6 mm, equilateral triangular steel pipes with a height of 80 mm, etc.

[0033] Preferably, the material of the thin-walled steel pipe 2 in this embodiment includes any one of carbon structural steel, alloy structural steel, and stainless steel. The material grade is selected based on the requirements of the product's hardness, yield strength, tensile strength, elasticity, corrosion resistance, etc. Thin-walled steel pipes 2 made of high-quality carbon structural steel, alloy structural steel, or stainless steel can be selected.

[0034] The thin-walled steel pipe 2 is made of the same material as the structural component 3.

[0035] Preferably, the steel-aluminum composite product of this embodiment includes any one of the following: a ship-shaped steel-aluminum composite product, a flat steel-aluminum composite product, a trapezoidal flat steel-aluminum composite product, and a U-shaped steel-aluminum composite product.

[0036] This embodiment also relates to a method for preparing a lightweight, high-strength steel-aluminum composite product, including the following steps: (1) According to the shape of the steel-aluminum composite product to be prepared, the thin-walled steel pipe 2 is pre-formed to prepare a series of single-piece formed thin-walled steel pipes 2; the two ends of the single-piece formed thin-walled steel pipe 2 are sealed to obtain the sealed thin-walled steel pipe 2; wherein, the number of the series of single-piece formed thin-walled steel pipes 2 is determined according to the shape and size of the steel-aluminum composite product, etc.

[0037] (2) Fix the sealed thin-walled steel pipe 2 onto the structural component 3 to obtain a thin-walled steel pipe assembly; (3) Install the thin-walled steel pipe assembly in the mold, pour molten aluminum alloy into the mold to form aluminum alloy layer 1, and obtain steel-aluminum composite product.

[0038] Preferably, in this embodiment, step (2) involves fixing the sealed thin-walled steel pipe 2 to the structural component 3 by welding; step (3) includes the following specific steps: installing the thin-walled steel pipe assembly in the corresponding mold, calibrating the assembly position of the thin-walled steel pipe 2, then pouring a lightweight gold molten liquid into the mold to form an aluminum alloy layer 1 around the thin-walled steel pipe assembly, followed by cooling and demolding to obtain a steel-aluminum composite product. The mold only needs to be a conventional casting mold.

[0039] Furthermore, the distance from each face of the thin-walled steel pipe assembly to the corresponding inner wall of the mold is 1 mm to 1.5 mm.

[0040] The following specific examples further illustrate the manufacturing of lightweight, high-strength steel-aluminum composite products.

[0041] Example 1: A steel-aluminum composite product in the shape of a boat with upturned ends.

[0042] The boat-shaped steel-aluminum composite product with upturned ends involved in this embodiment includes a first upturned part, a horizontal part, and a second upturned part. Figure 2The first raised portion, the horizontal portion, and the second raised portion are integrally formed into a boat-shaped steel-aluminum composite product by casting an aluminum alloy layer 1 around the boat-shaped thin-walled steel pipe assembly with raised ends. The cross-sectional shape of the thin-walled steel pipe 2 in the thin-walled steel pipe assembly includes a parallelogram and a triangle with an arc-shaped base. The cross-sectional shape of the thin-walled steel pipe 2 at the connection between the first raised portion and the horizontal portion is a triangle with an arc-shaped base, and the cross-sectional shape of the thin-walled steel pipe 2 at the connection between the second raised portion and the horizontal portion is a triangle with an arc-shaped base. The cross-sectional shape of the remaining thin-walled steel pipe 2 of the first raised portion, the horizontal portion, and the second raised portion is a parallelogram, for example, a rectangle, etc., and the specifications are set as needed. The angles between the first raised portion and the horizontal portion and the second raised portion and the horizontal portion are the same and less than 180°.

[0043] The preparation method of this lightweight, high-strength, boat-shaped steel-aluminum composite product with upturned ends is as follows: Figure 1 As shown, it includes the following steps: Step 1: Based on the dimensions of the lightweight, high-strength steel-aluminum composite product, and the boat-shaped design with upturned ends, such as... Figure 2 As shown, thin-walled steel pipe 2 is pre-formed to prepare a series of single-piece formed thin-walled steel pipes 2; the cut series of single-piece formed thin-walled steel pipes 2 are then subjected to surface treatments such as cleaning, rust removal, and passivation; the specifications of the thin-walled steel pipes 2 used are square thin-walled steel pipes 2 with dimensions of 40mm×40mm×0.5mm, as well as some parallelogram thin-walled steel pipes 2 and triangular thin-walled steel pipes 2 with arc-shaped bases. The material of the thin-walled steel pipes 2 is carbon structural steel.

[0044] Step 2: Based on the shape of each part of the lightweight high-strength steel-aluminum composite product, form the processed thin-walled steel pipe 2 into a single piece and seal both ends of the steel pipe.

[0045] Step 3: Assemble the single-piece formed thin-walled steel pipe 2 onto the transverse structural component 3 of the same material, and weld them together to obtain a thin-walled steel pipe assembly with the same shape as the finished product (e.g., Figure 3 (As shown); the distance between adjacent thin-walled steel pipes 2 is 1mm.

[0046] Step 4: Install the assembled thin-walled steel pipe assembly into the mold; the mold should have a 1mm aluminum alloy thickness allowance.

[0047] Step 5: Seal the mold according to the requirements for casting aluminum alloys to meet the pouring requirements.

[0048] Step 6: Pour molten aluminum alloy into the mold. The molten aluminum alloy is an aluminum-copper alloy.

[0049] Step 7: After pouring, cool to below 45°C or room temperature, remove the film, and you will get a lightweight, high-strength steel-aluminum composite product with upturned ends.

[0050] Example 2: Flat-shaped high-strength steel-aluminum composite product.

[0051] This embodiment relates to a flat, high-strength steel-aluminum composite product. Figure 4 The flat-shaped high-strength steel-aluminum composite product is integrally formed by casting an aluminum alloy layer 1 around a flat-shaped thin-walled steel tube assembly; the cross-sectional shape of the thin-walled steel tube 2 in the flat-shaped thin-walled steel tube assembly includes triangular and circular shapes; the thin-walled steel tube 2 with triangular cross-section, circular cross-section, and triangular cross-section are arranged sequentially from top to bottom in the flat-shaped thin-walled steel tube assembly; the specifications of each shape of thin-walled steel tube 2 are set as needed.

[0052] The preparation method of this lightweight, high-strength flat plate-shaped steel-aluminum composite product is as follows: Figure 1 As shown, it includes the following steps: Step 1: Based on the dimensions and flat shape of the lightweight, high-strength steel-aluminum composite product, such as... Figure 4 As shown, the thin-walled steel pipe 2 is pre-formed to prepare a series of single-piece formed thin-walled steel pipes 2; the cut single-piece formed thin-walled steel pipes 2 are subjected to surface treatments such as cleaning, rust removal, and passivation; the thin-walled steel pipes 2 are circular steel pipes with a diameter of Ø100mm×1mm, and triangular thin-walled steel pipes 2. The material of the thin-walled steel pipes 2 is alloy structural steel.

[0053] Step 2: Straighten the Ø100mm×1mm round and triangular steel pipes and seal both ends of the steel pipes.

[0054] Step 3: Assemble the straightened thin-walled steel pipe 2 onto the transverse structural component 3 of the same material and weld it to obtain a flat thin-walled steel pipe assembly; set the distance between the steel pipes to 1.5mm.

[0055] Step 4: Install the assembled thin-walled steel pipe assembly into the mold; the mold should have a 1.5mm aluminum alloy thickness allowance.

[0056] Step 5: Seal the mold according to the requirements for casting aluminum alloys to meet the pouring requirements.

[0057] Step 6: Pour molten aluminum alloy into the mold. The molten aluminum alloy is an aluminum-copper alloy.

[0058] Step 7: After pouring, cool to below 45°C or room temperature, remove the film, and obtain a flat, lightweight, high-strength steel-aluminum composite product.

[0059] Example 3: U-shaped high-strength steel-aluminum composite product.

[0060] The U-shaped high-strength steel-aluminum composite product involved in this embodiment ( Figure 5 The thin-walled steel tubes 2 in the U-shaped thin-walled steel tube assembly are integrally formed by casting an aluminum alloy layer 1 around them; the cross-sectional shape of the thin-walled steel tubes 2 in the U-shaped thin-walled steel tube assembly includes at least one of the following: triangle, triangle with an arc base, circle, parallelogram, and trapezoid; the U-shaped thin-walled steel tubes 2 are arranged longitudinally in the U-shaped thin-walled steel tube assembly, and the specifications of each shape of thin-walled steel tube 2 are set as needed.

[0061] The preparation method of this lightweight, high-strength U-shaped steel-aluminum composite product is as follows: Figure 1 As shown, it includes the following steps: Step 1: Based on the dimensions of the lightweight, high-strength steel-aluminum composite product, the product is U-shaped, such as... Figure 5 As shown, the thin-walled steel pipe 2 is pre-formed to prepare a series of single-piece formed thin-walled steel pipes 2; the cut thin-walled steel pipes 2 are then subjected to surface treatments such as cleaning, rust removal, and passivation; the thin-walled steel pipe 2 is a rectangular steel pipe with dimensions of 50mm × 20mm × 0.6mm. The material of the thin-walled steel pipe 2 is stainless steel.

[0062] Step 2: Straighten the 50mm×20mm×0.6mm rectangular steel pipe and pre-bend it into a U-shape to seal both ends of the steel pipe.

[0063] Step 3: Assemble the U-shaped thin-walled steel pipe 2 onto the transverse structural component 3 of the same material and weld it to obtain the U-shaped thin-walled steel pipe assembly; set the distance between the steel pipes to 1.2mm.

[0064] Step 4: Install the assembled thin-walled steel pipe assembly into the mold; the mold has a reserved aluminum alloy thickness of 1.2mm.

[0065] Step 5: Seal the mold according to the requirements for casting aluminum alloys to meet the pouring requirements.

[0066] Step 6: Pour molten aluminum alloy into the mold. The molten aluminum alloy is an aluminum-magnesium-silicon alloy.

[0067] Step 7: After pouring, cool to below 45°C or room temperature, remove the film, and obtain a U-shaped lightweight high-strength steel-aluminum composite product.

[0068] Example 4: Steel-aluminum composite product with a trapezoidal cross-section.

[0069] This embodiment relates to a trapezoidal flat steel-aluminum composite product. Figure 6The thin-walled steel tube assembly is integrally formed by casting an aluminum alloy layer 1 around the thin-walled steel tube assembly with a trapezoidal cross-section; the shape of the cross-section of the thin-walled steel tube 2 in the trapezoidal thin-walled steel tube assembly includes at least one of triangle, circle, parallelogram, and trapezoid; the thin-walled steel tubes 2 are arranged sequentially in the trapezoidal thin-walled steel tube assembly, and the specifications of the thin-walled steel tubes 2 of each shape are set as needed.

[0070] The preparation method of this lightweight, high-strength steel-aluminum composite product with a trapezoidal cross-section is as follows: Figure 1 As shown, it includes the following steps: Step 1: Based on the dimensions of the lightweight, high-strength steel-aluminum composite product, the product is a flat plate with a trapezoidal cross-section, such as... Figure 6 As shown, the thin-walled steel pipe 2 is pre-formed to prepare a series of single-piece formed thin-walled steel pipes 2; the cut thin-walled steel pipes 2 are then subjected to surface treatments such as cleaning, rust removal, and passivation; the thin-walled steel pipe 2 is an equilateral triangular steel pipe with a height of 80mm. The material of the thin-walled steel pipe 2 is carbon structural steel.

[0071] Step 2: Straighten the equilateral triangular steel pipe with a height of 80mm and seal both ends of the steel pipe.

[0072] Step 3: Assemble the equilateral triangular steel pipe with a height of 80mm onto the horizontal structural component 3 of the same material, and weld it to obtain a trapezoidal thin-walled steel pipe assembly; set the distance between the steel pipes to 1mm.

[0073] Step 4: Install the assembled thin-walled steel pipe assembly into the mold; the mold should have a 1mm aluminum alloy thickness allowance.

[0074] Step 5: Seal the mold according to the requirements for casting aluminum alloys to meet the pouring requirements.

[0075] Step 6: Pour molten aluminum alloy into the mold. The molten aluminum alloy is an aluminum-magnesium-silicon alloy.

[0076] Step 7: After pouring, cool to below 45°C or room temperature, remove the film, and obtain a trapezoidal lightweight high-strength steel-aluminum composite product.

[0077] In summary, the steel-aluminum composite product manufactured by this invention possesses both lightweight and high strength properties; compared with existing technologies, while achieving the same strength, the density decreases to 1 g / cm³ as the volume increases. 3 the following.

[0078] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A lightweight, high-strength steel-aluminum composite product, characterized in that, The steel-aluminum composite product includes a built-in thin-walled steel pipe assembly and an integrally cast aluminum alloy layer (1) around the thin-walled steel pipe assembly; the thin-walled steel pipe assembly includes a thin-walled steel pipe (2) and a structural component (3), the thin-walled steel pipe (2) being fixed to the structural component (3).

2. The lightweight, high-strength steel-aluminum composite product according to claim 1, characterized in that, The thin-walled steel pipe (2) has closed structures at both ends; the thin-walled steel pipe (2) includes at least two thin-walled steel pipes (2), and adjacent thin-walled steel pipes (2) are fixed at intervals on the structural member (3).

3. The lightweight, high-strength steel-aluminum composite product according to claim 1, characterized in that, The thin-walled steel pipe (2) is a steel pipe with a ratio of outer diameter to wall thickness greater than 20.

4. The lightweight, high-strength steel-aluminum composite product according to claim 3, characterized in that, The cross-sectional shape of the thin-walled steel pipe (2) is any one or a combination of at least two of the following: rectangular, circular, elliptical, parallelogram, trapezoidal, and triangular.

5. The lightweight, high-strength steel-aluminum composite product according to claim 3, characterized in that, The steel-aluminum composite products include any one of the following: ship-shaped steel-aluminum composite products, flat steel-aluminum composite products, U-shaped steel-aluminum composite products, and trapezoidal steel-aluminum composite products.

6. The lightweight, high-strength steel-aluminum composite product according to claim 5, characterized in that, The ship-shaped steel-aluminum composite product includes a first raised portion, a horizontal portion, and a second raised portion; the first raised portion, the horizontal portion, and the second raised portion are connected in sequence, and are integrally formed into a ship-shaped steel-aluminum composite product by casting an aluminum alloy layer (1) around the ship-shaped thin-walled steel pipe assembly.

7. The lightweight, high-strength steel-aluminum composite product according to claim 6, characterized in that, The included angle between the first raised portion and the horizontal portion is the same as the included angle between the second raised portion and the horizontal portion, and the included angle is less than 180°.

8. The lightweight, high-strength steel-aluminum composite product according to claim 5, characterized in that, The flat steel-aluminum composite product is integrally formed by casting an aluminum alloy layer (1) around the flat thin-walled steel pipe assembly; the flat thin-walled steel pipe assembly is arranged from top to bottom as follows: a thin-walled steel pipe (2) with a triangular cross-section, a thin-walled steel pipe (2) with a circular cross-section, and a thin-walled steel pipe (2) with a triangular cross-section.

9. The lightweight, high-strength steel-aluminum composite product according to claim 5, characterized in that, The U-shaped high-strength steel-aluminum composite product is integrally formed by casting an aluminum alloy layer (1) around a U-shaped thin-walled steel tube assembly; the U-shaped thin-walled steel tube assembly has U-shaped thin-walled steel tubes (2) spaced apart.

10. The lightweight, high-strength steel-aluminum composite product according to claim 5, characterized in that, The trapezoidal steel-aluminum composite product is integrally formed by casting an aluminum alloy layer (1) around a thin-walled steel tube assembly of a trapezoidal flat plate; the thin-walled steel tube assembly of the trapezoidal steel-aluminum composite product has thin-walled steel tubes (2) spaced apart.

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