Production method of 5083 aluminum alloy flat cast ingot

Abstract

The invention provides a production method of a 5083 aluminum alloy flat cast ingot, which comprises the following steps: S1) burdening according to the components of 5083 aluminum alloy, smelting, and carrying out in-furnace refining on the smelted melt; s2) carrying out on-line degassing on the melt obtained in the step S1), and then carrying out on-line filtering; (S3) the melt obtained in the step (S2) is cast, the bottom filling time of casting ranges from 110 s to 120 s, the casting speed ranges from 39 mm / min to 45 mm / min, and the cooling water flow ranges from 50 m < 3 > / h.piece to 80 m < 3 > / h.piece; s4, the cast ingot obtained in the step S3 is subjected to homogenizing annealing, and the 5083 aluminum alloy flat cast ingot is obtained.In the production process of the 5083 aluminum alloy flat cast ingot, the bottom filling time, the casting speed and the cooling water flow in the casting process are controlled, so that smooth production of the 5083 aluminum alloy flat cast ingot is facilitated, and the metallurgical quality of the cast ingot is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloys, and in particular to a production method of a 5083 aluminum alloy flat ingot. Background Art

[0002] 5083 aluminum alloy belongs to the 5××× series Al-Mg alloy with high magnesium content. It is widely used in aerospace, transportation, mold manufacturing and other civilian fields because of its low density, high specific strength, good corrosion resistance, good welding performance and processing performance.

[0003] With the development of large-scale semiconductor materials, the demand for using large-scale ingots as forging blanks is also increasing, but the length of ingots that can be forged by forging equipment does not exceed 3600mm, and the difficulty of forging over 3600mm is greatly increased; At present, Φ1350 ultra-large round ingots are used as forging blanks, and the ingot production process is: batching, feeding → smelting → composition adjustment → furnace refining → online degassing → online filtration → same-level hot top casting → homogenization annealing and machining (head and tail sawing, car skin). Southwest Aluminum Melting and Foundry has the ability to produce Φ1350 ultra-large round ingots as blanks for forgings; however, only two casting machines can produce this specification, the production task is heavy, it is difficult to schedule ultra-large round ingots, the casting speed is slow, and only one ingot is cast at a time. The casting machine is in manual mode during the round ingot casting process, and the bottom filling and unloading are manually controlled, and the product stability is not enough. The square ingot casting speed is fast, the casting machine is in automatic mode, and the bottom filling and unloading parameters are set in advance, which ensures the stability of the product. In addition, two 800×1700mm 5083 square ingots can be cast at a time, and the amount of ingot metal is sufficient to make up for the problem of insufficient billet supply.

[0004] However, the larger the size of the aluminum alloy ingot, the more difficult it is to cast. The 800×1700 size is very thick, and the slow cooling of the metal in the center during the production process may cause aluminum leakage or ingot cracking, and affect the metallurgical quality of the ingot after forming. Therefore, it is of great significance to provide a preparation method for 5083 aluminum alloy flat ingot. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a method for producing 5083 aluminum alloy flat ingots. The present invention can achieve stable production and ensure the quality of the aluminum alloy flat ingots during the preparation process.

[0006] In view of this, the present application provides a method for producing a 5083 aluminum alloy flat ingot, comprising the following steps: S1) mixing the 5083 aluminum alloy according to its composition and then smelting it, and refining the smelted melt in a furnace; S2) degassing the melt obtained in step S1) online, and then filtering it online; S3) Casting the melt obtained in step S2), wherein the bottom filling time of the casting is 110-120s, the casting speed is 39-45mm / min, and the cooling water flow rate is 50-80m 3 / h·root; S4) homogenizing the ingot obtained in step S3) to obtain a 5083 aluminum alloy flat ingot.

[0007] Preferably, in step S1), the temperature of the melt is 700-760°C.

[0008] Preferably, in step S2), the furnace refining method includes: refining with furnace bottom air bricks, refining with HD2000 refining device, manual refining, and refining with IRMA refining device.

[0009] Preferably, the online degassing is performed using an Alpur online degassing device.

[0010] Preferably, the online filtration is performed using deep bed filtration or ceramic filter plate filtration.

[0011] Preferably, the bottom filling time is 120s, the casting speed is 40-44mm / min, and the cooling water flow rate is 60-70m 3 / h·root.

[0012] Preferably, the casting temperature is 700-730°C.

[0013] Preferably, the casting temperature is 700-720°C.

[0014] Preferably, the cast crystallizer is an aluminum crystallizer and the base is made of steel.

[0015] Preferably, the specification of the 5083 aluminum alloy flat ingot is 800×1700 mm.

[0016] The present application provides a method for producing 5083 aluminum alloy flat ingots, which firstly batches the materials according to the composition of the 5083 aluminum alloy and then melts it, refines the melt after melting in a furnace, degasses and filters the melt online, then casts the melt, and finally performs homogenization annealing; during the production process, the present application controls the bottom filling time, casting speed and cooling water flow rate during the casting process, thereby facilitating the smooth production of 5083 aluminum alloy flat ingots and ensuring the metallurgical quality of the ingots; further, the present application adopts the above method to produce 5083 aluminum alloy flat ingots, which is twice as fast and can produce two ingots at a time, thereby improving the production efficiency by about four times, and the casting process is automatically controlled, the bottom filling condition is stable each time the production is produced, and the quality stability of the aluminum alloy flat ingots is higher. DETAILED DESCRIPTION

[0017] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0018] In view of the problem that in the production process of 5083 aluminum alloy flat ingots in the prior art, large-sized ingots are difficult to form and the quality is difficult to ensure, the present application provides a production method of 5083 aluminum alloy flat ingots, which adjusts some parameters in the casting process so that the production process of 5083 aluminum alloy flat ingots can be carried out smoothly and the quality of aluminum alloy ingots can be ensured. Specifically, the embodiment of the present invention discloses a production method of 5083 aluminum alloy flat ingots, comprising the following steps: S1) mixing the 5083 aluminum alloy according to its composition and then smelting it, and refining the smelted melt in a furnace; S2) degassing the melt obtained in step S1) online, and then filtering it online; S3) Casting the melt obtained in step S2), wherein the bottom filling time of the casting is 110-120s, the casting speed is 39-45mm / min, and the cooling water flow rate is 50-80m 3 / h·root; S4) homogenizing the ingot obtained in step S3) to obtain a 5083 aluminum alloy flat ingot.

[0019] In the production process of 5083 aluminum alloy flat ingot, the present application firstly mixes the ingredients according to the composition of 5083 aluminum alloy and then melts it, and then the melted molten metal is refined in a furnace; the raw materials of the mixes are raw materials well known to those skilled in the art, and the smelting is carried out in a manner well known to those skilled in the art, and there is no particular limitation in the present application. For example, the smelting is carried out in a smelting furnace, and the temperature of the melted molten metal is 710-760°C, and specifically, the temperature of the melted molten metal is 720-750°C. The melted molten metal is then refined in a furnace, and the furnace refining is carried out in a manner well known to those skilled in the art, and there is no particular limitation in the present application. For example, the furnace refining methods include: refining with a permeable brick at the bottom of the furnace, refining with a HD2000 refining device, artificial refining, and refining with an IRMA refining device. The composition of the 5083 aluminum alloy, measured by mass percentage, includes: Si ≤0.40%, Fe ≤0.40%, Cu ≤0.10%, Mn 0.40~1.0%, Mg 4.0~4.9%, Cr 0.05~0.25%, Zn ≤0.25%, Ti ≤0.15, and the balance is Al.

[0020] The present application further performs online degassing on the melt obtained as described above, and then performs online filtration; the online degassing adopts Alpur online degassing device for online degassing, and the online filtration adopts deep bed filtration or ceramic filter plate filtration; the specific implementation of the above online degassing and the above online filtration is carried out in a manner well known to those skilled in the art, and the present application has no special restrictions on this.

[0021] According to the present invention, the melt is then cast, wherein the bottom filling time of the casting is 110-120 s, the casting speed is 39-45 mm / min, and the cooling water flow rate is 50-80 m 3 / h·root, the temperature is 700~730℃; specifically, the bottom filling time is 120s, the casting speed is 40~44mm / min, the cooling water flow rate is 60~70m 3 / h·root, the temperature is 700~720℃; at the same time, the casting is carried out by a semi-continuous automatic casting machine, the crystallizer is made of aluminum, and the base is made of steel. The above casting process helps to ensure the surface quality, the ingot does not crack, and no cold shut defects occur.

[0022] After the above casting is completed, the present application finally performs homogenization annealing on the ingot, and the specific process of the homogenization annealing is as follows: The temperature control method is metal temperature control. After the furnace is loaded, the furnace heating temperature is set to 400~600℃. When the metal couple temperature reaches 450~500℃, it enters the insulation state. The insulation temperature is set to 450~500℃ and the insulation time is 24~30h. In a specific embodiment, the temperature control method is metal temperature control. After the furnace is loaded, the furnace heating temperature is 500°C. When the metal couple temperature reaches 470±5°C, it enters the insulation state. The insulation temperature is set to 470°C and is kept for 26 hours.

[0023] The production method of the above-mentioned 5083 aluminum alloy flat ingot provided in the present application is for aluminum alloy ingots with a specification of 800×1700mm, which can provide ingots for forging; the production speed of the flat ingot is 1 times faster, and two ingots can be produced at a time, and the casting process is automatically controllable, the production process is continuous and stable, and the quality stability is higher.

[0024] In order to further understand the present invention, the production method of 5083 aluminum alloy flat ingot provided by the present invention is described in detail below in conjunction with embodiments, and the protection scope of the present invention is not limited by the following embodiments.

[0025] Production process: batching, feeding → smelting → composition adjustment → furnace refining → online degassing → online filtration → automatic casting → homogenization annealing and machining (head and tail sawing, milling).

[0026] (1) Ingredients and feeding Mix and add materials according to the national standard ingredients in Table 1;

[0027] Table 1 5083 aluminum alloy composition data table

[0028] (2) Melting The raw materials after feeding are melted in a melting furnace, and the melt temperature is controlled at 750°C after melting; (3) Ingredient adjustment After sampling and analyzing the melt obtained in step (2) in front of the furnace, the melt is adjusted according to the national standard composition in Table 1 to ensure that it meets the national standard; (4) Furnace refining Refining the melt furnace bottom air-permeable bricks obtained in step (3); (5) Online degassing The melt refined in the furnace is degassed online in the Alpur online degassing device; (6) Online filtration The melt after online degassing is subjected to deep bed filtration; (7) Casting The casting was carried out using a Novelis casting machine semi-continuous automatic casting machine, the crystallizer was made of aluminum and the base was made of steel; (8) Homogenization annealing and machining; The ingot obtained in step (7) is subjected to homogenization annealing in a box-type soaking furnace according to the prior art; after the head and tail of the soaking ingot are cut, the surface is milled, and a test piece is taken for analysis.

[0029] The following comparative examples and embodiments prepare 800×1700 mm 5083 aluminum alloy ingots according to the above steps, and the specific composition is: the main element Mn is controlled at 0.7%, Mg is controlled at 4.5%, Cr is controlled at 0.075%, and the remaining elements are not higher than the upper limit; the difference lies in the changes in the casting process, as shown below: Comparative Example 1 Melting 1, after batching, feeding, smelting, composition adjustment, furnace refining, online degassing, online filtration, casting began, the bottom filling time was controlled at 120s, the casting speed was 40mm / min, and the cooling water flow rate was 90m 3 / h·root, the casting temperature is controlled at 700~720℃.

[0030] Upon testing, it was found that the ingot prepared in this comparative example had a large cold shut at the corner, and cracks were generated and the ingot was scrapped.

[0031] Example 1 Melt 2, after batching, feeding, smelting, composition adjustment, furnace refining, online degassing, online filtration, casting begins, the bottom filling time is controlled at 120s, the casting speed is 40mm / min, and the cooling water flow rate is 60m 3 / h·root, and the casting temperature was controlled at 700-720° C. The ingot of this embodiment was smoothly formed without any cracks.

[0032] After analysis: the chemical composition meets the standards, the liquid hydrogen content is 0.12ml / 100gAl, the solid hydrogen content is 0.13ug / g, the low-magnification grain size is level 1, and the coarse grain layer depth is 9mm, meeting the acceptance requirements.

[0033] Example 2 Melting 3, after batching, feeding, smelting, composition adjustment, furnace refining, online degassing, online filtration, casting began, the bottom filling time was controlled at 120s, the casting speed was 42mm / min, and the cooling water flow rate was 60m 3 / h·root, and the casting temperature was controlled at 700-720° C. The ingot of this embodiment was smoothly formed without any cracks.

[0034] After analysis: the chemical composition meets the standards, the liquid hydrogen content is 0.1ml / 100gAl, the solid hydrogen content is 0.11ug / g, the low-magnification grain size is level 1, and the coarse grain layer depth is 8mm, meeting the acceptance requirements.

[0035] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0036] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for producing a 5083 aluminum alloy flat ingot, comprising the following steps: S1) mixing the 5083 aluminum alloy according to its composition and then smelting it, and refining the smelted melt in a furnace; S2) degassing the melt obtained in step S1) online, and then filtering it online; S3) Casting the melt obtained in step S2), wherein the bottom filling time of the casting is 110-120s, the casting speed is 39-45mm / min, and the cooling water flow rate is 50-80m 3 / h·root; S4) homogenizing the ingot obtained in step S3) to obtain a 5083 aluminum alloy flat ingot.

2. The production method according to claim 1, characterized in that In step S1), the temperature of the melt is 700-760°C.

3. The production method according to claim 1, characterized in that In step S2), the furnace refining methods include: furnace bottom air brick refining, HD2000 refining device refining, manual refining, and IRMA refining device refining.

4. The production method according to claim 1, characterized in that The online degassing is performed using an Alpur online degassing device.

5. The production method according to claim 1, characterized in that: The online filtration adopts deep bed filtration or ceramic filter plate filtration.

6. The production method according to claim 1, characterized in that: The bottom filling time is 120s, the casting speed is 40-44mm / min, and the cooling water flow rate is 60-70m 3 / h·root.

7. The production method according to claim 1, characterized in that: The casting temperature is 700-730°C.

8. The production method according to claim 1 or 7, characterized in that: The casting temperature is 700-720°C.

9. The production method according to claim 1, characterized in that: The cast crystallizer is an aluminum crystallizer, and the base is made of steel.

10. The production method according to any one of claims 1 to 9, characterized in that: The specification of the 5083 aluminum alloy flat ingot is 800×1700 mm.

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