Manufacturing method of 5000 series h11x aluminum plate

Abstract

series aluminum slab to obtain a cast aluminum slab; homogenizing the cast aluminum slab, and cutting into slices to obtain a homogenized aluminum slab; subjecting the homogenized aluminum slab to a rough rolling process to obtain a rough rolled aluminum plate; performing cold spraying and air cooling processes by using rolling oil for cooling the rough rolled aluminum plate to obtain a cooled aluminum plate; and subjecting the cooled aluminum plate to a finishing rolling process to obtain the

Description

[Technical Field]

[0001] This invention relates to a method for preparing a 5000 series H11X type aluminum plate, and more particularly to a method for preparing an aluminum plate by using a modified 5000 series aluminum billet with added chromium and vanadium, and a homogenization process at a specific temperature. [Previous Technology]

[0002] Due to structural support requirements, the yield strength of 5000 series H112 to H116 aluminum plates needs to be greater than 215 MPa. Existing methods for preparing 5000 series H112 to H116 aluminum plates include the following steps: casting aluminum billets; homogenizing and slitting them; heating at a high temperature between 400°C and 550°C, and performing a rough rolling process using reciprocating rolling to achieve a plate thickness between 20 mm and 60 mm; then performing a water-oil spraying and air cooling process to cool the aluminum plate to between 220°C and 250°C; finally, using a finishing rolling process to obtain an aluminum plate with a thickness between 10 mm and 40 mm and a yield strength greater than 215 MPa. In the water-oil spraying and air cooling process, the cooling terminal temperature is adjusted according to the different thicknesses of the aluminum plates produced. For example, for an aluminum plate with a thickness of 60 mm, the cooling terminal temperature is below 200°C; for an aluminum plate with a thickness between 40 mm and 60 mm, the cooling terminal temperature is between 200°C and 230°C; for an aluminum plate with a thickness between 20 mm and 40 mm, the cooling terminal temperature is between 220°C and 240°C; and for an aluminum plate with a thickness of less than 20 mm, the cooling terminal temperature is 250°C.

[0003] In the above-mentioned prior art process for preparing 5000 series H112 to H116 type aluminum plates, in order to retain the processing strain energy of the produced aluminum plate and maintain the yield strength of the aluminum plate, a water-oil cooling and air-cooling process is required after the reciprocating rolling process, and the final rolling temperature is controlled below 250°C. The purpose of performing the water-oil cooling and air-cooling process is to avoid the final rolling temperature from exceeding 250°C, which would cause the strain energy introduced into the aluminum plate by rolling to soften due to differential recovery, resulting in unqualified aluminum plates with a yield strength of less than 215 MPa. However, this water-oil cooling and air-cooling process results in an average waiting time of 15 to 40 minutes when preparing each aluminum plate (the waiting time varies depending on the thickness of the aluminum plate), which limits the monthly output of aluminum plates and affects revenue.

[0004] Based on the shortcomings of the prior art, developing a method for preparing 5000 series H11X type aluminum plates that can shorten the process time is an urgent problem to be solved in this field. [Summary of the Invention]

[0005] In order to solve the problems of the prior art, the purpose of the present invention is to provide a method for preparing 5000 series H11X type aluminum plates. By using modified 5000 series aluminum blanks with added chromium and vanadium and a homogenization process at a specific temperature, the average waiting time of 15 to 40 minutes during the preparation of each aluminum plate can be shortened, thereby achieving the effects of shortening the process, saving energy and doubling the product output.

[0006] To achieve the above objective, the present invention provides a method for preparing a 5000 series H11X type aluminum plate, comprising: Step 1: casting a modified 5000 series aluminum billet to obtain a cast aluminum billet; wherein, based on the total weight of the modified 5000 series aluminum billet, the modified 5000 series aluminum billet includes chromium (Cr) between 0.1wt% and 0.2wt% and vanadium (V) between 0.01wt% and 0.05wt%; Step 2: homogenizing the cast aluminum billet and then slitting it to obtain a homogenized aluminum billet; wherein the homogenization temperature is between 350°C and 420°C, and the homogenization time is between 8 hours and 18 hours; Step 3: performing a rough rolling process on the homogenized aluminum billet to obtain a rough rolled aluminum plate; Step 4: Using a water-oil cold spray and air cooling process, the rough-rolled aluminum plate is cooled to between 210°C and 290°C to obtain a cooled aluminum plate; and Step 5: The cooled aluminum plate is subjected to a finish rolling process to obtain the 5000 series H11X type aluminum plate; wherein the preparation method does not include intermediate annealing, cold rolling and stabilization annealing processes.

[0007] In one specific embodiment, the temperature of the rough rolling process is between 400°C and 550°C.

[0008] In one specific embodiment, the homogenization time is between 8 hours and 14 hours.

[0009] In one specific embodiment, the homogenization time is between 10 hours and 14 hours.

[0010] In one specific embodiment, the homogenization time is between 14 hours and 18 hours.

[0011] In one specific embodiment, the rough-rolled aluminum plate is cooled to between 250°C and 290°C.

[0012] In one specific embodiment, the rough-rolled aluminum plate is cooled to between 260°C and 290°C.

[0013] In one specific embodiment, the rough-rolled aluminum plate is cooled to between 250°C and 280°C.

[0014] In one specific embodiment, the rough-rolled aluminum plate is cooled to between 260°C and 280°C.

[0015] In one specific embodiment, the rough-rolled aluminum sheet is cooled to between 250°C and 270°C.

[0016] In one specific embodiment, the rough-rolled aluminum sheet is cooled to between 230°C and 270°C.

[0017] In one specific embodiment, the homogenization temperature is between 380°C and 420°C.

[0018] In one specific embodiment, the homogenization temperature is between 400°C and 420°C. In one specific embodiment, the thickness of the 5000 series H11X type aluminum plate is between 10 mm and 40 mm.

[0019] In one specific embodiment, the yield strength of the 5000 series H11X type aluminum plate is between 190 MPa and 250 MPa.

[0020] The method for preparing 5000 series H11X type aluminum plates of the present invention utilizes modified 5000 series aluminum billets with added chromium and vanadium, and a homogenization process at a specific temperature. The generation of nano-precipitates can limit intragranular differential slip (i.e., pinning effect) during hot rolling and suppress the recrystallization behavior of the aluminum plate. Furthermore, based on the advantages of the above process, the cooling terminal temperature of the subsequent water-oil spraying and air-cooling processes can be increased to between 210°C and 290°C (the cooling terminal temperature of the water-oil spraying and air-cooling processes is adjusted according to the thickness of the aluminum plate). Accordingly, compared to the prior art, the average waiting time of 15 to 40 minutes during the preparation of each aluminum plate can be shortened (the waiting time will vary depending on the thickness of the aluminum plate), while the yield strength of the resulting aluminum plate is greater than 215 MPa, meeting the qualified specifications for structural support requirements. Furthermore, compared to existing methods for preparing 5000 series H11X type aluminum plates, the method of this invention eliminates the need for intermediate annealing, cold rolling, and stabilization annealing processes, and can produce aluminum plates with greater thickness. Therefore, the method of this invention for preparing 5000 series H11X type aluminum plates achieves the effects of shortening the process, saving energy, and doubling product output.

Implementation Method

[0021] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand other advantages and effects of the present invention from the content disclosed in this specification. However, the exemplary embodiments disclosed in this invention are for illustrative purposes only and should not be considered as limiting the scope of the present invention. In other words, the present invention can also be implemented or applied through other different embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0022] Unless otherwise stated herein, the singular forms “a” and “the” used in the specification and the appended claims include the plural individuals. Unless otherwise stated herein, the term “or” used in the specification and the appended claims includes the meaning of “and / or”.

[0023] Unless otherwise stated herein, the term “water-adjusting oil” as used in the specification and the appended claims refers to commercially available rolling oil.

[0024] Unless otherwise stated herein, the aluminum plates referred to as “5000 series H11X type” in the specification and the appended claims refer to aluminum plates including 5000 series H112 to H116 types.

[0025] Preparation Example 1: Preparation of the first aluminum plate

[0026] Referring to Figure 1, the preparation method of the first aluminum plate includes: Step 1: Casting modified 5083 series aluminum billet to obtain cast aluminum billet; wherein, based on the total weight of the modified 5083 series aluminum billet, the modified 5083 series aluminum billet includes 0.18wt% chromium and 0.025wt% vanadium; Step 2: Homogenizing the cast aluminum billet and then cutting it to obtain homogenized aluminum billet; wherein the homogenization temperature is 380℃ and the homogenization time is 12 hours; Step 3: Using Gleeble hot rolling simulation, the homogenized aluminum billet is subjected to a rough rolling process to obtain a rough rolled aluminum plate; wherein the temperature of the rough rolling process is 500°C; and Step 4: Using a water-oil cold spray and air cooling process, the rough rolled aluminum plate is cooled to 240°C to obtain a cooled aluminum plate; and Step 5: The cooled aluminum plate is subjected to a finish rolling process to obtain a first aluminum plate with a thickness of 40 mm.

[0027] Preparation Example 2: Preparation of the second to sixth aluminum plates

[0028] The preparation methods of the second to sixth aluminum plates are generally the same as those of the first aluminum plate, except that, as shown in Table 1 below, the homogenization temperature and time in step 2 of the preparation process of the second to sixth aluminum plates are different from those in step 2 of the preparation process of the first aluminum plate, thus obtaining the second to sixth aluminum plates. Table 1: Homogenization temperature and time in step 2 of the preparation process of the first to sixth aluminum plates aluminum plate Homogenization temperature and time First Aluminum Plate 380℃, 12 hours Second aluminum plate 400℃, 12 hours Third aluminum plate 420℃, 12 hours Fourth aluminum plate 450℃, 12 hours Fifth aluminum plate 510℃, 12 hours + 400℃, 10 hours Sixth Aluminum Plate 440℃, 4 hours + 400℃, 10 hours

[0029] Comparative Example: Preparation of the seventh to twelfth aluminum plates

[0030] The preparation methods of the seventh to twelfth aluminum plates are generally the same as those of the first to sixth aluminum plates, except that the seventh to twelfth aluminum plates are cast using 5083 series aluminum billets in step 1, rather than modified aluminum billets.

[0031] Example: Testing the hardness of the first to twelfth aluminum plates and observing their metallographic structure.

[0032] Referring to Figures 2 and 3, the results show that the hardness of the first to third aluminum plates obtained in step 2 using a homogenization temperature between 380°C and 420°C and a homogenization time of 12 hours is between 115 HV and 116.5 HV, and the metallographic structures all show rolled structures (see Figure 3(a) to (c)). Furthermore, if the homogenization temperature is increased to 450°C in step 2, the hardness of the fourth aluminum plate obtained will decrease to 110 HV, and the metallographic structure of the fourth aluminum plate suggests that the rolled structure of the fourth aluminum plate has undergone recovery (see Figure 3(d)). Furthermore, if the homogenization temperature is changed to a two-stage high-temperature homogenization process in step 2, the hardness of the fifth and sixth aluminum plates obtained is between 111 HV and 112 HV, and the yield strength of the sixth aluminum plate is 215 MPa. Moreover, the metallographic diagrams of the fifth and sixth aluminum plates show that the rolled structure of the fifth and sixth aluminum plates exhibits the initial recrystallization phenomenon (see Figure 3(e) and (f)).

[0033] Furthermore, referring to Figures 2 and 3, the results show that the hardness of the seventh to twelfth aluminum plates prepared in the comparative example is between 107 HV and 111 HV, and the yield strength does not reach the standard value of 215 MPa. Moreover, the metallographic diagrams of the seventh to twelfth aluminum plates show that recrystallization occurs in the rolled structure of the seventh to twelfth aluminum plates (see (g) to (l) in Figure 3).

[0034] Furthermore, the preparation method of the 5000 series H11X type aluminum plate of the present invention is compared with the prior art preparation method of the 5000 series H11X type aluminum plate. Referring to Table 2, it is shown that the preparation method of the 5000 series H11X type aluminum plate of the present invention does not require intermediate annealing, cold rolling, and stabilization annealing processes, and can produce aluminum plates with a relatively thick thickness. Table 2: Comparison of the preparation method of the 5000 series H11X type aluminum plate of the present invention and the prior art preparation method of the 5000 series H11X type aluminum plate. process Homogenization temperature Hot rolling and temperature Intermediate annealing cold rolling Temperature of stabilization annealing Properties of the aluminum plate produced This invention 350℃ to 420℃ After hot rolling, the aluminum sheet is cooled to between 210°C and 290°C using a water-oil cold spray and air cooling process. No intermediate annealing required No need for cold rolling No stabilization annealing required The thickness of the aluminum sheet is between 10 mm and 40 mm; The yield strength of aluminum plates is between 190 MPa and 250 MPa. Existing technology 450℃ to 550℃ 400℃ to 550℃ 300℃ to 500℃ Cold rolling required 80℃ to 120℃ The thickness of the aluminum sheet is between 10 mm and 40 mm.

[0035] As can be seen from the above, the method for preparing 5000 series H11X type aluminum plates of the present invention utilizes modified 5000 series aluminum billets with added chromium and vanadium, and a homogenization process at a specific temperature. The generation of nano-precipitates can limit intragranular differential slip (i.e., pinning effect) during hot rolling and suppress the recrystallization behavior of the aluminum plate. In addition, based on the advantages of the above process, the cooling terminal temperature of the subsequent water-oil cooling spray and air cooling process can be increased to between 210°C and 290°C (the cooling terminal temperature of the water-oil cooling spray and air cooling process is adjusted according to the thickness of the aluminum plate). Accordingly, compared with the prior art, the average waiting time of 15 to 40 minutes during the preparation of each aluminum plate can be shortened (the waiting time will vary for aluminum plates of different thicknesses). At the same time, the yield strength of the prepared aluminum plate is greater than 215 MPa, meeting the qualified specifications for structural support requirements. Furthermore, compared to existing methods for preparing 5000 series H11X type aluminum plates, the method of this invention eliminates the need for intermediate annealing, cold rolling, and stabilization annealing processes, and can produce aluminum plates with greater thickness. Therefore, the method of this invention for preparing 5000 series H11X type aluminum plates achieves the effects of shortening the process, saving energy, and doubling product output.

[0036] The above embodiments are merely illustrative of the method for preparing the 5000 series H11X type aluminum plate of the present invention, and are not intended to limit the present invention. Any person skilled in the art can modify and alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be as set forth in the following claims. [Simplified Explanation of the Diagram]

[0037] Figure 1 is a flowchart of the preparation method of the first aluminum plate of the present invention. Figure 2 is a hardness result diagram of the first to twelfth aluminum plates of the present invention. Figure 3 is a metallographic diagram of the first to twelfth aluminum plates of the present invention.

Claims

1. A method for preparing a 5000 series H11X type aluminum plate, comprising: Step 1: Cast the modified 5000 series aluminum billet to obtain the cast aluminum billet; The modified 5000 series aluminum billet, by total weight, comprises between 0.1 wt% and 0.2 wt% chromium and between 0.01 wt% and 0.05 wt% vanadium; Step 2: The cast aluminum billet is homogenized and then slit to obtain homogenized aluminum billets; the homogenization temperature is between 350°C and 420°C, and the homogenization time is between 8 hours and 18 hours; Step 3: The homogenized aluminum billet is subjected to a rough rolling process to obtain a rough rolled aluminum plate; Step 4: The rough rolled aluminum plate is cooled to between 210°C and 290°C using a water-oil cold spray and air cooling process to obtain a cooled aluminum plate; and Step 5: The cooled aluminum plate is subjected to a finish rolling process to obtain the 5000 series H11X type aluminum plate; The preparation method does not include intermediate annealing, cold rolling, and stabilization annealing processes.

2. The method as described in claim 1, wherein the homogenization process takes between 8 hours and 14 hours.

3. The method as described in claim 1, wherein the rough-rolled aluminum sheet is cooled to between 250°C and 290°C.

4. The method as described in claim 3, wherein the rough-rolled aluminum sheet is cooled to between 260°C and 290°C.

5. The method as described in claim 3, wherein the rough-rolled aluminum sheet is cooled to between 250°C and 280°C.

6. The method as described in claim 5, wherein the rough-rolled aluminum sheet is cooled to between 260°C and 280°C.

7. The method as described in claim 1, wherein the temperature of the homogenization process is between 380°C and 420°C.

8. The method as described in claim 1, wherein the temperature of the homogenization process is between 400°C and 420°C.

9. The method as described in claim 1, wherein the thickness of the 5000 series H11X type aluminum plate is between 10 mm and 40 mm.

10. The method as described in claim 1, wherein the yield strength of the 5000 series H11X type aluminum plate is between 190 MPa and 250 MPa.

Images