5083 marine aluminum alloy plate and processing method thereof

Abstract

The invention provides a processing method of an aluminum alloy plate for a 5083 ship. The processing method comprises the following steps: A) milling a surface of a cast ingot; heating the cast ingot subjected to surface milling; and B) carrying out hot rough rolling on the cast ingot, and then stretching. The cold rolling and finished product annealing procedures are creatively omitted, the machining technological process is shortened, the production cost is reduced, and the equipment productivity is improved. Through the temperature control rolling method, the finish rolling temperature of the plate is reduced, and the comprehensive and refined control method for the plate shape, thickness difference and temperature in the hot rolling process is obtained. The technology has high practicability, and the production efficiency of the plate is improved by shortening the technological process.

Description

Technical Field

[0001] The invention relates to the technical field of materials, and in particular to a 5083 marine aluminum alloy plate and a processing method thereof. Background Art

[0002] 5083 is a typical high-Mg marine aluminum alloy material with high strength (215-295MPa) and intergranular corrosion (≤15mg / cm 2 ) performance has certain requirements. At present, most aluminum alloy plate manufacturers obtain products that meet both mechanical properties and corrosion properties through the method of "uncontrolled temperature rolling + cold pressing + finished product heat treatment". However, it is still a difficult problem in the industry to obtain materials that meet mechanical properties, corrosion properties, thickness difference and surface quality through the "hot rolling temperature control" process.

[0003] In recent years, with the gradual deepening and promotion of the dual-carbon strategy, the trend of lightweight marine materials has become increasingly obvious. In order to meet the rapidly growing market demand, if we continue to use the "uncontrolled temperature rolling + cold pressing + finished product heat treatment" process to produce 5083 marine aluminum alloy plates, we will face serious production capacity shortages.

[0004] The solutions to this problem usually include the following aspects, such as: ①Increasing the number of shifts. ②Extending the shift time. ③Increasing the speed of equipment operation and increasing the workload of a single shift. However, these three methods have little effect on improving the problems of long process, low efficiency and high cost of 5083 marine aluminum alloy plates, and still cannot meet the production capacity requirements.

[0005] Therefore, it is very necessary to develop a new processing method for 5083 marine aluminum alloy sheet. Summary of the invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a processing method for 5083 marine aluminum alloy plate. The method provided by the present invention has high efficiency, low cost and good performance.

[0007] The present invention provides a method for processing a 5083 marine aluminum alloy plate, comprising:

[0008] A) Milling the ingot surface; heating the ingot after the milling;

[0009] B) The ingot is subjected to hot rough rolling and then stretched.

[0010] In some specific implementation schemes, the milling amount is 20 to 40 mm / total milling amount.

[0011] In some specific implementations, the temperature of the ingot heating is

[0012] 460~490℃, insulation time: 3~48h.

[0013] In some specific implementations, during the hot rough rolling:

[0014] When the thickness is 500-300mm, the equal pressure reduction control is adopted, and the pressure reduction is 5-15mm per pass;

[0015] When the thickness is less than 300-75mm, the equal pressure reduction control is adopted, and the pressure reduction is 10-25mm per pass;

[0016] Thickness <75~ finished product thickness (finished product thickness is 10~25mm), equal reduction rate.

[0017] In some specific implementation schemes, the final rolling temperature of the hot rough rolled plate is 220-250°C.

[0018] In some specific implementation schemes, the rolling speed is 40-75 m / min.

[0019] In some specific implementation schemes, during the hot rough rolling: the emulsion injection amount is 400 to 500 cubic meters per hour; the emulsion purge time is the last two purge passes.

[0020] In some specific implementation schemes, the stretching rate in step B) is 0.5% to 0.8%, and the yield strength is set to 200 to 220 MPa.

[0021] In some specific implementation schemes, the hot rough rolling is bilateral emulsion opening.

[0022] The present invention provides a 5083 marine aluminum alloy plate, which is prepared by the preparation method described in any one of the above technical solutions.

[0023] Compared with the prior art, the present invention provides a method for processing 5083 marine aluminum alloy plates, including: A) milling the ingot surface; heating the ingot after milling; B) hot rough rolling the ingot, and then stretching it. The present invention creatively eliminates the cold pressing and finished product annealing processes, shortens the processing process, reduces production costs, and improves equipment capacity. The present invention reduces the final rolling temperature of the plate through a temperature-controlled rolling method, and obtains a comprehensive and refined control method for the plate shape, thickness difference, and temperature in the hot rolling process. The process has strong practicality and improves the plate production efficiency by shortening the process flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a surface morphology diagram of a plate material according to Example 1 of the present invention;

[0025] Figure 2 This is a thickness distribution diagram of a plate material according to Example 1 of the present invention;

[0026] Figure 3 This is a surface morphology diagram of a plate according to Example 2 of the present invention;

[0027] Figure 4 This is a thickness distribution diagram of a plate material according to Example 2 of the present invention;

[0028] Figure 5 This is a surface morphology diagram of a plate material according to Example 3 of the present invention;

[0029] Figure 6 This is a plate thickness distribution diagram of Example 3 of the present invention. DETAILED DESCRIPTION

[0030] The present invention provides a short-process 5083 marine aluminum alloy plate and a processing method thereof. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve it. It should be particularly pointed out that all similar replacements and modifications are obvious to those skilled in the art, and they all fall within the scope of protection of the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the method and application of this article without departing from the content, spirit and scope of the present invention to realize and apply the technology of the present invention.

[0031] It should be understood that the expression "one or more of..." includes each of the items recited after the expression individually and in various different combinations of two or more of the recited items, unless otherwise understood from the context and usage. The expression "and / or" in combination with three or more recited items should be understood to have the same meaning, unless otherwise understood from the context.

[0032] The use of the terms "comprising", "having" or "containing", including their grammatical synonyms, should generally be understood as open and non-restrictive, for example not excluding other unrecited elements or steps, unless otherwise specifically stated or otherwise understood from the context.

[0033] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural.

[0034] The present invention is a short-process process optimization. By precisely controlling the rolling process parameters / process, a product that simultaneously meets the requirements of strength, plate shape (no bubbles or deformation), thickness difference (no ultra-thickness or ultra-thinness, and must meet the thickness difference requirements), and uniformity of whole plate performance (the performance difference in the length and width directions of the plate cannot be too large) is obtained.

[0035] The present invention provides a method for processing a 5083 marine aluminum alloy plate, comprising:

[0036] A) Milling the ingot surface; heating the ingot after the milling;

[0037] B) The ingot is subjected to hot rough rolling and then stretched.

[0038] The 5083 marine aluminum alloy plate processing method provided by the invention firstly mills the surface of the ingot.

[0039] In some specific implementation schemes, the milling amount is 20 to 40 mm / total milling amount.

[0040] In some specific embodiments, the milling amount is 20 mm, 25 mm, 30 mm, 32 mm, 35 mm, 40 mm, or a range between any two of the above.

[0041] The thickness of the ingot after milling is preferably 360mm, 365mm, 370mm, 375mm, 380mm, 400mm, 430mm, 460mm, 465mm, 470mm, 475mm, 480mm; or a range between any two of the above.

[0042] After the ingot is milled, the ingot is heated;

[0043] In some specific implementation schemes, the ingot is heated to a temperature of 460 to 490° C., and the insulation time is 3 to 48 hours.

[0044] In some specific implementation schemes, the ingot heating temperature is 460°C, 470°C, 475°C, 478°C, 480°C, 490°C; or a range between any two of the above.

[0045] The holding time for heating the ingot may be 3 h, 5 h, 8 h, 10 h, 15 h, 20 h, 25 h, 30 h, 35 h, 40 h, 45 h or 48 h; or a range value between any two of the above.

[0046] The ingot is subjected to hot rough rolling.

[0047] In some specific implementations, during the hot rough rolling:

[0048] When the thickness is 500-300mm, the equal pressure reduction control is adopted, and the pressure reduction is 5-15mm per pass; specifically, it can be 5mm, 10mm or 15mm;

[0049] When the thickness is less than 300-75mm, the equal pressure reduction control is adopted, and the pressure reduction is 10-25mm per pass; specifically, it can be 10mm, 15mm, 20mm or 25mm;

[0050] The thickness is less than 75 mm and the thickness of the finished product is 10 to 25 mm (the thickness of the finished product is 10 to 25 mm), and the reduction rate is constant; the reduction rate is 10 to 20% for a single pass; specifically, it can be 10%, 15% or 20%;.

[0051] In some specific implementation schemes, the rolling speed is 40-75 m / min, and can be 40 m / min, 42 m / min, 43 m / min, 45 m / min, 50 m / min, 53 m / min, 55 m / min, 56 m / min, 60 m / min, 65 m / min, 70 m / min, 73 m / min, 74 m / min or 75 m / min, or a range between any two of the above.

[0052] The process speed of the present invention is relatively slow. If the speed is directly reduced after cutting the head and tail, the hot rolling roller will cool down quickly, the roller shape will deteriorate, and the plate shape will deteriorate, edge waves will easily appear, and the thickness difference of the plate will be more difficult to control. Therefore, it is necessary to reduce the speed and control the temperature between the cutting head and tail thickness and the finished product thickness to ensure the hot rolling roller shape and the final product shape and thickness difference.

[0053] In some specific implementation schemes, the final rolling temperature of the hot rough rolled plate is 220-250°C.

[0054] Specifically, the temperature may be 220°C, 225°C, 230°C, 235°C, 237°C, 240°C, 245°C or 250°C, or a range between any two of the above.

[0055] In some specific implementation schemes, during the hot rough rolling: the emulsion injection amount is 400 to 500 cubic meters per hour; the emulsion purge time is the last two purge passes.

[0056] Specifically, it can be 400 cubic meters / hour, 420 cubic meters / hour, 450 cubic meters / hour, 455 cubic meters / hour, 463 cubic meters / hour, 470 cubic meters / hour, 475 cubic meters / hour or 500 cubic meters / hour.

[0057] After hot rough rolling, stretching is performed.

[0058] According to the present invention, the elongation is 0.5% to 0.8%, and the yield strength is set at 200 to 220 MPa.

[0059] The elongation rate of the present invention is 0.5%, 0.6%, 0.7% or 0.8%; or a range between any two of the above. The yield strength setting value is 200-220MPa. It can be 200MPa, 210MPa or 220MPa.

[0060] In some specific implementation schemes, the hot rough rolling is bilateral emulsion opening.

[0061] The double-sided emulsion of the present invention has a good cooling effect, and combined with the rolling speed, the plate final rolling temperature can be controlled to 220-250° C. The final rolling temperature cannot be too low, otherwise residual bubbles in the emulsion are likely to appear.

[0062] The present invention controls the cold rolling deformation rate to be greater than 18% in the last three passes (below the recrystallization temperature) to ensure the strength. Generally, the recrystallization temperature of 5083 is about 270-300°C.

[0063] The present invention adopts a hot rough rolling temperature control method, cancels cold pressing + finished product heat treatment, and uses the hot rolling mill as a "hot rolling mill + cold rolling mill". The entire rolling process is difficult to operate, far beyond the conventional rolling capacity of the hot rolling mill, and violates the operator's conventional operating habits. Therefore, in the process of exploring new methods, it is easy to have problems such as excessive plate thickness difference, deterioration of plate shape and waves, and residual bubbles due to incomplete emulsion blowing on the plate surface.

[0064] The present invention provides a 5083 marine aluminum alloy plate, which is prepared by the preparation method described in any one of the above technical solutions.

[0065] The present invention provides a 5083 marine aluminum alloy plate processing method, comprising: A) milling the ingot surface; heating the ingot after milling; B) hot rough rolling the ingot, and then stretching it. The present invention creatively eliminates the cold rolling and finished product annealing processes, shortens the processing process, reduces production costs, and improves equipment capacity. The present invention reduces the final rolling temperature of the plate through a temperature-controlled rolling method, and obtains a comprehensive and refined control method for the plate shape, thickness difference, and temperature in the hot rolling process. The process has strong practicality and improves the plate production efficiency by shortening the process flow.

[0066] The present invention obtains a short-process technology for "hot rolling temperature control" rolling 5083 marine aluminum alloy plates, which meets the requirements of customers on mechanical properties, corrosion properties, thickness difference and surface quality.

[0067] It should be understood that the order of steps or the order in which certain actions are performed is not important as long as the present invention remains operable. In addition, two or more steps or actions may be performed simultaneously.

[0068] The use of any and all examples or exemplary language, such as "for example" or "including", herein is intended only to better illustrate the invention and does not limit the scope of the invention unless otherwise claimed. No language in this specification should be construed as indicating that any non-claimed element is essential to the practice of the invention.

[0069] In addition, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as accurately as possible. However, any numerical value inherently inevitably contains standard deviations due to individual test methods. Therefore, unless otherwise expressly stated, it should be understood that all ranges, quantities, values ​​and percentages used in this disclosure are modified by "about". Here, "about" generally means that the actual value is within plus or minus 10%, 5%, 1% or 0.5% of a specific value or range.

[0070] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0071] Some cases are recorded in the embodiments and comparative examples of the present invention, wherein the embodiments show certain implementation modes of the present invention. However, this does not mean that the effects of the present invention can only be achieved in these cases.

[0072] In order to further illustrate the present invention, a short-process 5083 marine aluminum alloy plate and a processing method thereof provided by the present invention are described in detail below in conjunction with embodiments.

[0073] Example 1

[0074] Process flow: ingot milling → ingot heating → hot rough rolling → stretching → sampling and testing → packaging

[0075] Milling: Ingot thickness is 400mm; Milling amount: 30mm / total milling amount; Ingot thickness after milling is 370mm;

[0076] Ingot heating: heating temperature: 475℃, holding time: 15h;

[0077] Hot rough rolling: rolling process requirements:

[0078] Table 1 Rolling table for thickness 370-300mm

[0079] Rolling pass 1 2 3 4 5 6 7 8 Ingot thickness / mm 370 365 360 350 340 325 310 300 Single pass reduction / mm 5 5 10 10 15 15 10 Rolling speed / m / min 40 42 40 45 45 45 45 45

[0080] Table 2 Rolling table for thickness <300-75mm

[0081]

[0082]

[0083] Table 3 Rolling table when thickness is less than 75-12mm

[0084] Rolling pass 20 21 22 23 24 25 26 27 28 29 Ingot thickness / mm 68 61 55 46 37 30 24 19 15 12 Single pass reduction rate / % 10 10 10 15 20 20 20 20 20 20 Rolling speed / m / min 70 70 75 75 40 43 42 43 50 53

[0085] The final rolling temperature of the plate is 245°C.

[0086] Emulsion injection volume: 475 cubic meters per hour.

[0087] Emulsion purge time: last 2 passes.

[0088] Tensile: Elongation control range 0.5%, yield strength setting value 200MPa.

[0089] Table 4 Performance test results

[0090]

[0091] Figure 1 The surface morphology of the plate in Example 1 of the present invention; Figure 2 This is a plate thickness distribution diagram of Example 1 of the present invention.

[0092] Example 2

[0093] Process flow: ingot milling → ingot heating → hot rough rolling → stretching → sampling and testing → packaging

[0094] Milling: Ingot thickness is 400mm; Milling amount: 32mm / total milling amount; Ingot thickness after milling is 368mm;

[0095] Ingot heating: heating temperature: 478℃, holding time: 20h;

[0096] Hot rough rolling: rolling process requirements:

[0097] Table 5 Rolling table for thickness 368-300mm

[0098]

[0099] Table 6 Rolling table for thickness <300-75mm

[0100]

[0101]

[0102] Table 7 Rolling table when thickness is less than 75-15mm

[0103] Rolling pass 20 21 22 23 24 25 26 27 28 Ingot thickness / mm 68 61 55 46 37 30 24 19 15 Single pass reduction rate / % 10 10 10 15 20 20 20 20 20 Rolling speed / m / min 65 65 65 50 40 43 42 43 50

[0104] The final rolling temperature of the plate is 240°C.

[0105] Emulsion injection volume: 455 cubic meters per hour.

[0106] Emulsion purge time: last 2 passes.

[0107] Tensile: Elongation control range 0.6%, yield strength setting value 210MPa.

[0108] Table 8 Performance test results

[0109]

[0110] Figure 3 This is a surface morphology diagram of a plate according to Example 2 of the present invention; Figure 4 This is a plate thickness distribution diagram of Example 2 of the present invention.

[0111] Example 3

[0112] Process flow: ingot milling → ingot heating → hot rough rolling → stretching → sampling and testing → packaging

[0113] Milling: Ingot thickness is 400mm; Milling amount: 28mm / total milling amount; Ingot thickness after milling is 372mm;

[0114] Ingot heating: heating temperature: 470℃, holding time: 18h;

[0115] Hot rough rolling: rolling process requirements:

[0116] Table 9 Rolling table for thickness 372-300mm

[0117]

[0118] Table 10 Rolling table for thickness <300-75mm

[0119]

[0120]

[0121] Table 11 Rolling table for thickness <75-17mm

[0122] Rolling pass 20 21 22 23 24 25 26 27 28 Ingot thickness / mm 68 61 55 46 40 34 27 21 17 Single pass reduction rate / % 10 10 10 15 15 15 20 20 20 Rolling speed / m / min 65 65 65 50 40 43 42 43 50

[0123] The final rolling temperature of the plate is 237°C.

[0124] Emulsion injection volume: 463 cubic meters per hour.

[0125] Emulsion purge time: last 2 passes.

[0126] Tensile: Elongation control range 0.6%, yield strength setting value 210MPa.

[0127] Table 12 Performance test results

[0128]

[0129] Figure 5 This is a surface morphology diagram of a plate material according to Example 3 of the present invention; Figure 6 This is a plate thickness distribution diagram of Example 3 of the present invention.

[0130] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for processing 5083 marine aluminum alloy sheet, characterized in that: include: A) Ingot milling surface; Heating the ingot after milling; B) The ingot is subjected to hot rough rolling and then stretched.

2. The method according to claim 1, characterized in that The milling amount is 20 to 40 mm / total milling amount.

3. The method according to claim 1, characterized in that The ingot is heated at a temperature of 460-490° C. and the insulation time is 3-48 hours.

4. The method according to claim 1, characterized in that: In the hot rough rolling: When the thickness is 500-300mm, the equal pressure reduction control is adopted, and the pressure reduction is 5-15mm per pass; When the thickness is less than 300-75mm, the equal pressure reduction control is adopted, and the pressure reduction is 10-25mm per pass; Thickness <75~ finished product thickness (finished product thickness is 10~25mm), equal reduction rate.

5. The method according to claim 1, characterized in that The final rolling temperature of the hot rough rolled plate is 220-250°C.

6. The method according to claim 1, characterized in that The rolling speed is 40-75 m / min.

7. The method according to claim 1, characterized in that In the hot rough rolling, the emulsion spraying amount is 400 to 500 cubic meters per hour, and the emulsion blowing time is the last two blowing passes.

8. The method according to claim 1, characterized in that In step B), the elongation is 0.5% to 0.8%, and the yield strength is set at 200 to 220 MPa.

9. The method according to claim 1, characterized in that: The hot rough rolling is double-sided emulsion rolling.

10. A 5083 marine aluminum alloy plate, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 9.

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