Continuous cast rolling process and cast rolling equipment for 5052D low-silicon high-magnesium aluminum alloy

Abstract

The invention provides a continuous cast rolling method of a 5052D low-silicon high-magnesium aluminum alloy, which comprises the following steps: preparing aluminum alloy raw materials in percentage by mass: less than or equal to 0.60% of Si, 2.2-2.6% of Mg, less than or equal to 0.70% of Fe, 0.05-0.20% of Cu, 0.25-0.60% of Mn, less than or equal to 0.10% of Zn, less than or equal to 0.15% of Ti, less than or equal to 0.15% of Cr, less than or equal to 0.05% of single other impurities, less than or equal to 0.15% of the sum of other impurities, and the balance of Al and other inevitable impurities; 2, the aluminum alloy raw materials prepared in the step 1 are subjected to continuous cast rolling at the temperature of 695-720 DEG C, the rolling force of continuous cast rolling is 12000-24000 kN, and the speed of continuous cast rolling is 0.5-1.0 m / min; in the casting-condensing-rolling process of continuous casting and rolling, the aluminum alloy raw material is quenched through water with the flow of 100-160 l / s, and the water temperature is 16-60 DEG C. On the other hand, the invention provides cast rolling equipment which comprises a batching device; a smelting furnace; a cast rolling unit; provided is a rapid cooling device. Through the special components of the raw materials and the manufacturing process, the balance between the conductivity and the mechanical property is considered, and the crystallization time is short and the crack edge is small in the casting and rolling process.

Description

Technical Field

[0001] This invention relates to a continuous casting and rolling process and equipment for 5052D low-silicon, high-magnesium aluminum alloy. Background Technology

[0002] Aluminum alloys are widely used in aerospace, automotive manufacturing, electronics, and construction due to their excellent properties such as lightweight, high strength, good electrical conductivity, and corrosion resistance. In particular, 6-series aluminum alloys, as medium-strength aluminum alloys with magnesium and silicon as the main alloying elements, have attracted much attention due to their good formability, weldability, and moderate strength. With the development of industrial technology, the performance requirements for aluminum alloy materials are constantly increasing, especially the demand for comprehensive performance in terms of high strength and high electrical conductivity.

[0003] Currently, continuous casting and rolling technology, as a highly efficient and energy-saving production process for aluminum alloy sheets and strips, has become an important method for aluminum alloy material preparation. Continuous casting and rolling technology combines the traditional casting and hot rolling processes into one, which not only simplifies the production process and reduces production costs, but also better meets environmental protection requirements due to its reduced energy consumption and waste. Among existing technologies, there are various methods for preparing aluminum alloy sheets and strips using continuous casting and rolling technology.

[0004] CN105349848B discloses a continuously cast and rolled aluminum alloy material for louvers and its manufacturing method. The aluminum alloy material is composed of elements such as Fe: 0.35-0.50%, Si: 0.65-0.90%, Cu: 0.30-0.50%, Mn: 0.50-0.70%, and Mg: 0.20-0.50%. By continuously casting and rolling followed by cold rolling and using an intermediate incomplete annealing process, an aluminum alloy material with a tensile strength of 310-330 MPa can be obtained. This technology is mainly aimed at louver applications and focuses on the strength and paintability of the material.

[0005] CN118814032A discloses a high-strength, high-conductivity aluminum alloy sheet and strip and its continuous casting and rolling preparation method. By adding rare earth elements Ce and La, as well as elements such as Si, Zn, Cu, and Fe, the aluminum alloy achieves a conductivity that reaches or is comparable to that of pure aluminum, while its mechanical properties are far superior to those of pure aluminum. This technology emphasizes the advantages of continuous casting and rolling processes in simplifying the production process, reducing costs, and minimizing energy consumption.

[0006] CN108642331B discloses a 6181 aluminum alloy for automotive sheet metal and its preparation method. By adjusting the composition through microalloying and optimizing processes such as solution treatment, artificial aging, and composite pretreatment, the mechanical and formability properties of the alloy are significantly improved. This technology specifically addresses the requirements for material mechanical and formability in automotive sheet metal applications.

[0007] However, some problems still need to be solved in the existing technology. First, in the casting and rolling process of high-silicon magnesium-aluminum alloys, production difficulties such as long crystallization time, high plate hardness, roll sticking and inability to roll or coil, and large edge cracks often occur, which seriously affect production efficiency and product quality. Second, the existing high-silicon magnesium-aluminum alloy preparation process is difficult to simultaneously meet the application requirements of high strength, high elongation, and high conductivity, especially when producing high-performance aluminum alloy plates and strips, it is difficult to balance conductivity and mechanical properties.

[0008] Therefore, developing a novel 5052D low-silicon, high-magnesium aluminum alloy and its continuous casting and rolling method to solve the above-mentioned technical problems is of great practical significance. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a continuous casting and rolling process and equipment for 5052D low-silicon high-magnesium aluminum alloy. This process balances elongation, electrical conductivity, and mechanical properties through the special composition of the raw materials and the manufacturing process, and also achieves short crystallization time and small crack edges during the casting and rolling process. These objectives are achieved as follows:

[0010] This invention proposes a 5052D low-silicon, high-magnesium aluminum alloy, composed of the following components by mass percentage: Si≤0.60%, Mg2.2-2.6%, Fe≤0.70%, Cu0.05-0.20%, Mn0.25-0.60%, Zn≤0.10%, Ti≤0.15%, Cr≤0.15%, other impurities less than 0.05% individually, the sum of other impurities less than 0.15%, and the balance being Al and other unavoidable impurities.

[0011] On the other hand, the present invention proposes a continuous casting and rolling method for manufacturing 5052D low-silicon, high-magnesium aluminum alloy, comprising the following steps: Step 1: Preparing aluminum alloy raw materials according to the following mass percentages, wherein Si≤0.60%, Mg2.2-2.6%, Fe≤0.70%, Cu0.05-0.20%, Mn0.25-0.60%, Zn≤0.10%, Ti≤0.15%, Cr≤0.15%, and other impurities individually less than 0.05%, and the sum of other impurities... Less than 0.15%, with the balance being Al and other unavoidable impurities; Step 2: The aluminum alloy raw material prepared in Step 1 is continuously cast and rolled at 695-720℃, with a rolling force of 12000-24000kN and a speed of 0.5-1.0m / min; Step 3: During the casting-solidification-rolling process of continuous casting and rolling, the aluminum alloy raw material is rapidly cooled by water with a flow rate of 100-160l / s and a water temperature of 16-60℃, so that it can be solidified and rolled into a plate.

[0012] Furthermore, the rolling force of the continuous casting and rolling is 17000-22000kN.

[0013] Furthermore, the continuous casting and rolling speed is 0.6-0.8 m / min.

[0014] Furthermore, in step three, the water temperature is 30-50℃.

[0015] Furthermore, the quench flow rate is 120-150 l / s.

[0016] Furthermore, the aluminum alloy raw material has an Fe content of 0.3-0.4% and a Cu content of 0.1-0.15%.

[0017] Furthermore, the Ti content of the aluminum alloy raw material is 0.02-0.08%.

[0018] On the other hand, the present invention proposes a casting and rolling equipment for manufacturing 5052D low-silicon, high-magnesium aluminum alloy, characterized in that it includes: a batching device for automatically weighing and feeding aluminum alloy raw materials according to a mass percentage; a melting furnace connected to the batching device for heating the batched aluminum alloy raw materials to form a uniform melt; a casting and rolling unit including a casting and rolling roll group; and a rapid cooling device set at a preset position in the casting and rolling unit for rapidly cooling the strip aluminum alloy billet.

[0019] Compared with the prior art, the beneficial effects of the present invention are: by optimizing the composition ratio of aluminum alloy raw materials, the elongation of the cast and rolled plate is significantly improved, and the plate hardness of high silicon magnesium aluminum alloy during the casting and rolling process is improved; by using a large flow rate rapid cooling of 100-160 l / s and water temperature control of 16-60℃, the precipitation of Mg-Si is effectively suppressed, and the purity and performance stability of the product are improved. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a continuous casting and rolling process for 5052D low-silicon, high-magnesium aluminum alloy. Detailed Implementation

[0021] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0022] Example 1

[0023] In one aspect, embodiments of the present invention provide a 5052D low-silicon, high-magnesium aluminum alloy, composed of the following components by mass percentage: Si 0.5%, Mg 2.3%, Fe 0.3%, Cu 0.1%, Mn 0.4%, Zn 0.05%, Ti 0.02%, Cr 0.1%, other impurities individually less than 0.05%, the sum of other impurities less than 0.1%, and the balance being Al and other unavoidable impurities; wherein, the Si content is controlled at 0.5%, which can improve the alloy's fluidity and casting performance; the Mg content is 2.3%, which can form The Mg2Si phase enhances the alloy's strength and hardness; the Fe content of 0.3% improves its heat resistance and creep resistance; the Cu content of 0.1% enhances both strength and hardness, while also improving heat treatment performance; the Mn content of 0.4% refines the grains, improving plasticity and toughness; the Zn content of 0.05% further enhances strength and hardness; the Ti content of 0.02% refines the grains; and the Cr content of 0.1% improves fluidity and prevents rolling mill stagnation. By rationally controlling the proportions of each element, the 5052D low-silicon, high-magnesium aluminum alloy of this embodiment exhibits high strength, good plasticity, excellent corrosion resistance, and good weldability, making it suitable for applications in aerospace, automotive manufacturing, and shipbuilding.

[0024] On the other hand, embodiments of the present invention provide a continuous casting and rolling method for manufacturing the 5052D low-silicon, high-magnesium aluminum alloy as described in Embodiment 1, comprising the following steps:

[0025] Step 1: Prepare aluminum alloy raw materials according to the following mass percentages: Si 0.5%, Mg 2.3%, Fe 0.3%, Cu 0.1%, Mn 0.4%, Zn 0.05%, Ti 0.02%, Cr 0.1%, other impurities less than 0.05% individually, and the sum of other impurities less than 0.1%, with the balance being Al and other unavoidable impurities;

[0026] Step 2: The aluminum alloy raw material prepared in Step 1 is continuously cast and rolled at 710℃. The rolling force of the continuous casting and rolling is 21000kN and the speed of the continuous casting and rolling is 0.7m / min.

[0027] Step 3: The aluminum alloy raw material in the continuous casting and rolling process is rapidly cooled at a flow rate of 130 l / s and a water temperature of 40℃.

[0028] In this embodiment, aluminum alloy raw materials are first prepared according to a specific composition ratio. During the preparation process, the content of each element needs to be precisely controlled to ensure the uniformity and stability of the alloy composition. After the raw material preparation is completed, the process proceeds to the continuous casting and rolling stage.

[0029] Continuous casting and rolling is a production method that combines casting and rolling processes. It can directly roll molten metal into plates, eliminating the need for ingot casting, homogenization, and heating processes in traditional methods. It has advantages such as high production efficiency, low energy consumption, and low cost. In this embodiment, the continuous casting and rolling temperature is controlled at 710℃, which ensures complete melting of the alloy without causing excessive oxidation or volatilization of alloying elements. The rolling force is controlled at 21000kN, which ensures sufficient deformation of the alloy while avoiding excessive rolling force that could overload the equipment or cause material cracking. The continuous casting and rolling speed is 0.7m / min, which ensures sufficient solidification and deformation of the alloy while maintaining high production efficiency.

[0030] During continuous casting and rolling, the alloy needs to undergo rapid cooling. Rapid cooling is a process that quickly lowers the alloy temperature to fix the alloy microstructure, prevents the growth and coarsening of precipitates, and thus improves the mechanical properties of the alloy. In this embodiment, the rapid cooling water flow rate is 130 l / s and the water temperature is 40℃. This combination of flow rate and water temperature ensures that the alloy cools rapidly and uniformly, avoiding deformation or cracking caused by uneven cooling. The 5052D low-silicon high-magnesium aluminum alloy prepared by the above continuous casting and rolling method has the characteristics of uniform microstructure, stable performance, and good surface quality, which can meet the needs of various high-requirement application scenarios.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A 5052D low-silicon, high-magnesium aluminum alloy, characterized in that, It consists of the following components by mass percentage: Si≤0.60%, Mg2.2-2.6%, Fe≤0.70%, Cu0.05-0.20%, Mn0.25-0.60%, Zn≤0.10%, Ti≤0.15%, Cr≤0.15%, other impurities less than 0.05% individually, the sum of other impurities less than 0.15%, and the balance being Al and other unavoidable impurities.

2. A continuous casting and rolling method for manufacturing the 5052D low-silicon, high-magnesium aluminum alloy as described in claim 1, characterized in that, The process includes the following steps: Step 1: Prepare aluminum alloy raw materials according to the following mass percentages: Si≤0.60%, Mg2.2-2.6%, Fe≤0.70%, Cu0.05-0.20%, Mn0.25-0.60%, Zn≤0.10%, Ti≤0.15%, Cr≤0.15%, other impurities less than 0.05% individually, and the sum of other impurities less than 0.15%, with the balance being Al and other unavoidable impurities; Step 2: Continuously cast and roll the aluminum alloy raw materials prepared in Step 1 at 695-720℃, with a rolling force of 12000-24000kN and a speed of 0.5-1.0m / min; Step 3: During the casting-solidification-rolling process of continuous casting and rolling, the aluminum alloy raw materials are rapidly cooled by water at a flow rate of 100-160l / s and a water temperature of 16-60℃, achieving solidification and then rolling into plates.

3. The continuous casting and rolling method for 5052D low-silicon, high-magnesium aluminum alloy according to claim 2, characterized in that, The rolling force of the continuous casting and rolling is 17000-22000kN.

4. The continuous casting and rolling method for 5052D low-silicon high-magnesium aluminum alloy according to claim 2, characterized in that, The continuous casting and rolling speed is 0.6-0.8 m / min.

5. The continuous casting and rolling method for 5052D low-silicon, high-magnesium aluminum alloy according to claim 2, characterized in that, In step three, the water temperature is 30-50℃.

6. The continuous casting and rolling method for 5052D low-silicon, high-magnesium aluminum alloy according to claim 2, characterized in that, The quench flow rate is 120-150 l / s.

7. The continuous casting and rolling method for 5052D low-silicon, high-magnesium aluminum alloy according to claim 2, characterized in that, The aluminum alloy raw material has an Fe content of 0.3-0.4% and a Cu content of 0.1-0.15%.

8. The continuous casting and rolling method for 5052D low-silicon, high-magnesium aluminum alloy according to claim 2, characterized in that, The Ti content of the aluminum alloy raw material is 0.02-0.08%.

9. A casting and rolling equipment for manufacturing the 5052D low-silicon, high-magnesium aluminum alloy as described in claim 1, characterized in that, Includes: a batching device for automatically weighing and feeding aluminum alloy raw materials according to a mass percentage; A melting furnace, connected to the batching device, is used to heat the prepared aluminum alloy raw materials to form a uniform melt. The casting and rolling unit includes casting and rolling roll sets; A rapid cooling device is installed at a preset position in the casting and rolling unit to rapidly cool the strip aluminum alloy billet.

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