CN112176264B - Heat treatment process of 5050 aluminum alloy - Google Patents
Heat treatment process of 5050 aluminum alloy Download PDFInfo
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- CN112176264B CN112176264B CN202010900313.8A CN202010900313A CN112176264B CN 112176264 B CN112176264 B CN 112176264B CN 202010900313 A CN202010900313 A CN 202010900313A CN 112176264 B CN112176264 B CN 112176264B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
Abstract
The invention relates to a heat treatment process of 5050 aluminum alloy. A heat treatment process of 5050 aluminum alloy comprises the following steps: (1) homogenizing heat treatment: cleaning the 5050 aluminum alloy coiled material after cold rolling, quickly heating to 270 +/-5 ℃, preserving heat for 8 hours, and then air cooling; (2) carrying out semi-finished product cold rolling and finished product cold rolling treatment on the 5050 aluminum alloy coiled material subjected to air cooling; (3) and (3) stabilizing heat treatment: cleaning the 5050 aluminum alloy coiled material after the cold rolling of the finished product, quickly heating to 200-220 ℃, and keeping the temperature for no more than 2 h; and then air cooling is carried out after heat preservation is carried out for 2-3h at the temperature of 220 ℃ and 230 ℃. According to the heat treatment process for the 5050 aluminum alloy, the yield strength and the elongation of the 5050 aluminum alloy are improved to the same level as those of 5052, and the defects of color difference, shading and the like caused by poor tissue uniformity after the material is oxidized are avoided; and has the characteristics of low heat treatment cost, high efficiency, strong performance stability and the like.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy processing, and particularly relates to a heat treatment process of 5050 aluminum alloy.
Background
The 5052 aluminum alloy for oxidizing the 3C electronic shell, which is widely used at home and abroad, mainly has two use states of H32 and O, and the product has certain forming capability, good oxidation uniformity and strong deformation damage resistance. In the early century, with the rapid expansion of 3C electronic products and related industries in China, through various means such as simulation and self improvement, a complete product processing and application system of 5052 aluminum alloy for oxidizing 3C electronic shells is formed for a plurality of aluminum processing enterprises represented by a medium aluminum system in China, and 5052 products for 3C electronic shells and even higher 5252 products with the same purpose represent the highest level in the product field in China and even in Asia regions including Japan and Korean.
However, the control level of Mg content in 5052 aluminum alloy of 2.2-2.8% provides high strength while also resulting in severe requirements for material processing equipment (multi-stand hot rolling mill, 6-roll cold rolling mill, etc.), and also has problems of reduced material formability and increased difficulty in designing and controlling surface features of the material. The 5052 alloy for 3C electronic shell oxidation is a material with the characteristic of self composition, so that the using state of the material is required to be in an H32 state or even an O state, and the requirement on forming capability can be met to the maximum extent. The characteristic of the final state of the material inevitably forms a certain degree of Mg segregation, finally influences the oxidation uniformity, and simultaneously induces the appearance defects of orange peel/slippage and the like when the material is greatly extended or bent, thereby limiting the application of the material on partial 3C electronic shells.
Corresponding to 5052 aluminum alloy, the 5050 aluminum alloy has 1.1-1.8% of Mg content and relatively low Mg content, greatly reduces the deformation resistance during material processing, can realize stable production of materials in a common single-stand hot rolling mill and a four-roll cold rolling mill, and provides a better material basis for reducing the design and control difficulty of the surface characteristics of finished products of the materials. If the problem of the decrease in the strength of the material due to the decrease in Mg could be solved by a process including the design of the material composition, a high elongation ability could be obtained. Then, when 5050 aluminum alloy is matched with more excellent surface design characteristics (uniform distribution of Mg) during rolling, 5050 aluminum alloy can replace 5052 aluminum alloy for 3C electronic oxidation, and has functional adaptability which is not possessed by current 5052 and even 5052 due to more uniform surface (interface) characteristics and more interface designability.
The overseas mature 5052 heat treatment technology is based on a series of processed blanks of hot rolled blanks provided by a '1 +3/1+ 4' hot continuous rolling mill, and adopts a homogenization and stabilization heat treatment process (the complete recrystallization temperature of aluminum alloy exceeding 1070) with higher temperature of a hot rolled finished product, so that the segregation behavior of Mg is inevitably induced, and the surface homogenization level is reduced when the finished product is oxidized; and has the characteristics of large equipment investment, high process control difficulty and poor equipment universality. However, in the case of a 5-series aluminum alloy, the composition uniformity fluctuation may be induced when the single-stand hot rolling mill is used as a main processing facility.
In view of the above, the invention provides a novel heat treatment process for 5050 aluminum alloy, which is developed through the heat treatment process, so that the strength (referred to as yield strength) and forming capacity (referred to as elongation) of 5052 aluminum alloy with high Mg content (Mg content is 2.4-2.6%) are obtained, and the shading problem caused by the uniformity of the structure of the oxidized material is avoided, and the produced 5050 aluminum alloy can replace 5052 aluminum alloy for 3C electronic oxidation.
Disclosure of Invention
The invention aims to provide a heat treatment process for 5050 aluminum alloy, which is developed through the heat treatment process, so that the strength (yield strength) and the forming capacity (elongation percentage) of 5052 aluminum alloy with high Mg content (Mg content is 2.4-2.6%) are obtained, and the shading problem caused by the uniformity of the structure is avoided after the material is oxidized, so that 5052 aluminum alloy used for 3C electronic shells can be replaced by 5050 aluminum alloy, and more choices are provided for the design of the oxidation characteristic of 3C materials; and the equipment universality is strong, and the method can be completed by common equipment.
In order to realize the purpose, the adopted technical scheme is as follows:
a heat treatment process of 5050 aluminum alloy comprises the following steps:
(1) homogenizing heat treatment: cleaning the 5050 aluminum alloy coiled material after cold rolling, quickly heating to 270 +/-5 ℃, preserving heat for 8 hours, and then air cooling;
(2) carrying out semi-finished product cold rolling and finished product cold rolling treatment on the 5050 aluminum alloy coiled material subjected to air cooling;
(3) and (3) stabilizing heat treatment: cleaning the 5050 aluminum alloy coiled material after the cold rolling of the finished product, quickly heating to 200-220 ℃, and keeping the temperature for no more than 2 h; and then air cooling is carried out after heat preservation is carried out for 2-3h at the temperature of 220 ℃ and 230 ℃.
Further, in the step (1): the homogenization heat treatment was performed in a nitrogen atmosphere.
Further, in the step (1): the thickness of the 5050 aluminum alloy coiled material after cold rolling is 3.5-4.0 mm.
Further, in the step (1): and (4) air cooling until the temperature of the workpiece does not exceed 150 ℃, and discharging.
Further, in the step (3): the stabilization heat treatment is performed in an air atmosphere.
Further, the thickness of the 5050 aluminum alloy coil after the cold rolling of the finished product in the step (3) is 0.6-1.2 mm.
Further, in the step (3), the total time of rapidly raising the temperature to 200-220 ℃ and maintaining the temperature at 200-220 ℃ is less than 4 h.
Further, in the step (3), air cooling is carried out within 2h until the temperature of the workpiece is less than 200 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. the heat treatment process of the 5050 aluminum alloy stably balances component homogenization fluctuation possibly induced by a 5-series aluminum alloy when a single-stand hot rolling mill is used as main processing equipment; the homogenization and stabilization heat treatment process which takes ultralow temperature as a characteristic for a long time is adopted, the process detail is controlled reasonably and controllably, the production process and the product characteristics are stable, and the method is suitable for industrial production of the middle-high-end 5-series aluminum alloy for oxidizing the 3C electronic shell.
2. The heat treatment process of the 5050 aluminum alloy adopts a process principle of integrated design of an ultralow temperature heat treatment process and a hot working aging treatment process, and stably realizes the process aims of tissue homogenization and stabilized heat treatment while greatly reducing the processing difficulty of semi-finished products and finished products of the material by reducing the processing strength in an H18 state, and has a more fine and uniform oxidized surface after the material is oxidized, so that the method for directly improving the selectivity of a rolling interface through the heat treatment process.
3. The heat treatment process of the 5050 aluminum alloy adopts a design method of replacing H32 with H34, improves equipment adaptability of domestic common single-stand hot rolling mills and common four-roll cold rolling mills by reducing the processing strength of H18 state, adopts an ultralow-temperature homogenization and stabilization heat treatment process, realizes tissue homogenization control to ensure that no texture defects such as bottom lines and the like exist after oxidation, obtains all mechanical properties of 5052 product H32 state products by heat treatment of H34 state on the premise of low strength of H18 state products, and finds similar or similar research and achievement never in previous related reports.
4. The heat treatment process for 5050 aluminum alloy has the characteristics of simple process control and equipment requirement for realizing industrial production, low equipment investment, strong equipment universality and low process management difficulty.
Detailed Description
In order to further illustrate the thermal treatment process of 5050 aluminum alloy of the present invention, and achieve the desired objects, the following detailed description of the thermal treatment process of 5050 aluminum alloy according to the present invention, and the detailed implementation, structure, features and effects thereof, will be made in conjunction with the preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Before describing the heat treatment process of 5050 aluminum alloy in detail, it is necessary to further describe the related methods mentioned in the present invention to achieve better results.
Related key technologies;
technical route of 5050 alloy for 3C electronic shell
The technical route of the 5050 aluminum alloy for oxidizing the 3C electronic shell is as follows, wherein the processing equipment mainly comprises a single-stand hot rolling mill and a four-roll cold rolling mill which are most common in China (the processing equipment is also suitable for processing products which mainly comprise a multi-stand hot rolling mill and a six-roll cold rolling mill):
1) typical technical route of 5050 aluminum alloy for oxidizing 3C electronic shell
The 5050 product for 3C electronic casing oxidation has different processing technical details and emphasis points due to different final specifications or product states, but the technical route of the 5050 aluminum alloy for 3C electronic casing oxidation generally passes through: the method comprises the following steps of slab ingot casting, slab ingot homogenization and hot working, coil heat treatment (homogenization heat treatment), coil cold working, coil cleaning, coil heat treatment (homogenization heat treatment), coil cold working, coil finished product cleaning, straightening, coil finished product heat treatment (stabilization heat treatment) and the like, wherein the technical core of the whole industry is focused on five core links such as casting component design, hot working technology, surface control rapidness, coil heat treatment technology, coil cold working and the like, and particularly, the typical technical route of the 5050 aluminum alloy product for 3C electronic shell oxidation is as follows:
the method comprises the steps of slab ingot casting → → slab ingot sawing and face milling → → slab ingot homogenization → → slab ingot hot working → → coil cold rolling → → coil intermediate cleaning → → coil heat treatment (homogenization heat treatment) → → cold working of coil (annealing material-containing semi-finished product cold working and finished product cold working) → → finished product cleaning and straightening → → finished product heat treatment (stabilization heat treatment) → → finished product rewinding detection warehousing (aluminum alloy processing flow end) → → finished product delivery and oxidation link deep processing.
2) 5050 aluminum alloy core quality and influencing factors for oxidizing 3C electronic shell
The 5050 aluminum alloy for oxidizing the 3C electronic shell has two clear technical indexes and a core quality requirement, wherein the two core technical indexes are as follows: the same yield strength as 5052 and elongation not less than 5052. One core quality requirement is: has lower and more stable surface roughness than 5052 on the basis of strictly controlling surface defects (such as color difference, scratch, shadow, sand hole and the like) which affect the surface uniformity and consistency of an oxidized finished product. Most of the technical methods and control measures influencing the yield strength, the material forming capability and the surface defect-free control have direct reverse effects, and the mutual conflict and unification of the control factors are the core of the whole product development and stabilization.
Based on the basic processing process flow of the 5050 aluminum alloy product for oxidizing the 3C electronic shell, the main factors influencing the product quality are concentrated on the following aspects:
slab ingot casting technique and composition design
Like the 5052 aluminum alloy, the 5050 alloy also needs to solve both of the core problems of the uniform distribution of phase Mg and the uniformity of structure (grain size) in slab ingot casting. The extremely active element characteristics of Mg determine that the segregation behavior of Mg during the casting of a plate ingot can not be avoided almost, the segregation behavior of Mg can directly cause the oxidation uniformity and consistency of finished product materials during oxidation, compared with 5052 which uses 1070 pure aluminum liquid to carry out Mg alloying, the segregation behavior of Mg is slightly different, and 5050 aluminum alloy for an electronic shell needs 1080 pure aluminum liquid with Fe content less than or equal to 0.1% to carry out Mg alloying.
2) Hot working technology for material
The machined surface of the aluminum alloy has heredity, the process characteristic that the product is finally oxidized determines that the interface uniformity and cleanness must be strictly controlled in the hot machining process (Mg segregation and oxidation are particularly avoided while homogenization is carried out), the 5052 aluminum alloy for oxidizing the 3C electronic shell with the hard state strength of 290Mpa needs to be homogenized by about 45 percent of machining rate when a multi-stand hot continuous rolling mill (1+3/1+4 hot continuous rolling mill) is used for finish rolling, and the clean control of the hot rolled surface is realized by pure water on-line cleaning of the last two continuous rolling passes. In contrast, the 5050 aluminum alloy has relatively low deformation resistance, can be stably processed by using the most common single-stand hot rolling mill in China at present, and then realizes the control of surface uniformity and cleanness through a technological method.
3) Heat treatment technology for material
For the process design of 5052 products for oxidizing 3C electronic shells, the higher Mg content and the requirement on the forming capability of the final finished products cause that a higher heat treatment temperature (more than 1070 complete recrystallization temperature of aluminum alloy) is required for the homogenization and stabilization heat treatment process, so that the segregation behavior of Mg is inevitably induced, and the surface homogenization level is reduced when the finished products are oxidized. In the case of 5050 aluminum alloy for oxidizing 3C electronic shells, the final product requirements of the aluminum alloy are the same as that of 5052 in yield strength and forming capability, so that the heat treatment process of the aluminum alloy becomes one of core technologies for replacing 5052 with 5050.
4) Material surface cleaning technology
One of the core problems of aluminum alloys for the oxidation of 3C electronic shells is that the surface characteristics of the material must form two basic characteristics after anodic oxidation: low defect rate and high uniformity. The method is characterized in that the mirror surface cannot have any defects affecting the uniformity and consistency of the mirror surface, such as shadows, chromatic aberration, scratches, sand holes and other visual non-mirror surface characteristics, and compared with 5052 under the production condition of a multi-stand hot rolling mill, the surface cleaning technology of 5050 aluminum alloy with a single-stand hot rolling mill as core processing equipment focuses on the process design of the last three passes of hot rolling.
5) Cold working technology for material
Because of the higher on-line strength of the 5052 aluminum alloy for the 3C electronic housing, when the aluminum alloy is subjected to cold processing after the homogenization heat treatment, the controllability of the surface roughness of the material is rapidly reduced along with the gradual downward edge of the processing pass, and the most direct problem is that the lowest value of the surface roughness of the material is increasingly difficult to realize the stabilization control along with the improvement of the work hardening (deformation resistance) degree of the 5052 cold processing, and finally, the surface roughness which directly influences the surface characteristics of an oxidized finished product is limited to the level of 0.14-0.15 μm at the lowest (the normal control level is 0.21-0.23 μm) under the dual influence of the production efficiency and the stabilization control requirement; different from 5052, 5050 aluminum alloy with lower material strength has more process adaptability, can ensure that the production efficiency is not reduced, stably controls the surface roughness to 0.10 mu m, and simultaneously realizes the stable control of the processed surface of the material, thereby reflecting more excellent processing adaptability.
With the understanding of the related methods mentioned in the present invention, the heat treatment process of a 5050 aluminum alloy of the present invention will be described in further detail below with reference to specific examples:
the invention relates to a heat treatment process of 5050 aluminum alloy, which is suitable for heat treatment of semi-finished products and finished products of 5050 alloy after deep processing of hot rolled blanks provided by a domestic most common single-stand hot rolling mill; the heat treatment process is matched with a developed special hot working process (aging process), so that the defects of color difference shading and the like caused by poor tissue uniformity are avoided after the material is oxidized, and the mechanical properties (yield strength and elongation) of the product are stably improved to the same level as 5052. Can be directly applied or guided to the heat treatment process of other 5 series alloys which take anodic oxidation treatment as an essential link, require to adapt to main body processing equipment by reducing the strength of materials and have high forming capability and oxidation characteristics required by products.
The equipment requirements are as follows: the most common nitrogen protection annealing furnace for domestic common aluminum alloys;
the technical scheme of the invention is as follows:
based on the strong cooling of the blanking of a hot-rolled coil of 7.0-7.5mm produced by a single-stand hot mill, the heat treatment process consists of two parts, namely a homogenization process aiming at a semi-finished product and a stabilization process aiming at a finished product:
(for the cleaned 5050 aluminum alloy coil subjected to cold rolling, the thickness is 3.5-4.0 mm): taking the H22 annealing state (yield strength range of 70-85Mpa) as a principle, rapidly heating once in a nitrogen atmosphere, and keeping the temperature for 8H at a constant temperature when the temperature of a workpiece is 270 +/-5 ℃; after the heat preservation time is up, the temperature is quickly reduced by using a fan in the furnace, and the workpiece is discharged after the temperature is less than or equal to 150 ℃.
(for the cleaned finished cold rolled 5050 aluminum alloy coil, 0.6-1.2mm in thickness or other customer specified thicknesses): H34-H36 is taken as an annealing target (yield strength is 165-175MPa), a staged over-temperature heating method is adopted in an air atmosphere, the heat preservation time of the workpiece temperature at 200-220 ℃ is ensured to be less than or equal to 2H (the heat preservation time of the workpiece temperature less than 200 ℃ has no obvious influence on material formation), and the heat preservation time at the highest material temperature at 220-230 ℃ is strictly limited to 2.0-3H; after the heat preservation time is up, the temperature of the workpiece is ensured to be less than 200 ℃ within 2h by using a fan in the furnace to rapidly cool (or the workpiece is directly discharged from the furnace and either natural cooling or air cooling is adopted).
Overall control requirements for stabilization annealing: (1) the total time of rapidly heating to 200 and 220 ℃ and keeping the temperature at 200 and 220 ℃ is less than 4 h; (2) the temperature of the workpiece is controlled to be 2-3h at 220-230 ℃.
The 5052 aluminum alloy is subjected to a stabilizing heat treatment process at high temperature. Since the magnesium content in the 5050 aluminum alloy is much lower than that in the 5052 aluminum alloy, the 5050 aluminum alloy is very sensitive to temperature and aging during the heat treatment process. When the preset temperature is high, the heating time is long. The long temperature rise process can affect the control of the performance of the 5050 aluminum alloy product. Therefore, the stabilizing heat treatment is insulated in stages, and the temperature difference between the two stages is small, so that the control of the performance of the 5050 aluminum alloy product is facilitated.
The existing heat treatment process is carried out at high temperature, and the principle is that a recovery recrystallization process is carried out to obtain a recovery structure. The invention adopts the ultra-low temperature heat treatment process and the thermal processing aging treatment process, so that the process of recovery recrystallization is avoided and the recovery structure is avoided. Tests prove that the method is more favorable for the forming capability and strength of products, controlling the oxidation effect, obtaining more fine and uniform oxidized surfaces, being favorable for different oxidized surfaces after the products are oxidized, and improving the selectivity of the surface characteristics of finished products.
Under the heat treatment process, the same-furnace heat treatment of products with different widths can be considered simultaneously; the oxidation of the alloy ingot under this treatment process and the respective associated treatment processes are exactly the same as 5052. The obtained 5050 aluminum alloy has the same mechanical properties (elongation and yield strength) as those of 5052 aluminum alloy for 3C electronic shells. After the material is molded and oxidized, the same hardness as that of the 5052 oxide material is achieved, meanwhile, color difference or shading caused by surface cleaning or processing texture and other abnormalities does not occur on the surface, and the product completely meets various quality requirements of 5052 series alloy for 3C electronic shells.
Example 1.
The specific operation steps are as follows:
(1) a preparation stage:
the thickness of the hot-rolled coil product is 7.0-7.5mm, and the final rolling temperature of hot rolling is controlled at 280-300 ℃; after hot rolling is finished, quickly transferring the materials into an intelligent warehouse for forced cooling by a fan;
(2) homogenizing heat treatment:
after the hot rolled blank is cold rolled to the thickness of 3.5mm and is cleaned, the hot rolled blank is transferred to a nitrogen protection annealing process. The furnace temperature was raised to 300 ℃ for 3h and incubation was started. After the temperature of the material reaches 270 +/-5 ℃, the temperature of furnace gas is set to 270 ℃ and the temperature is kept for 8 hours.
After the heat preservation time of 8 hours is up, closing the heating system, and opening a fan in the furnace for forced cooling; discharging the material when the temperature of the material is less than or equal to 150 ℃, and transferring the material to a cold working link for preparing deep processing (the deep processing is the cold rolling treatment of semi-finished products and the cold rolling treatment of finished products).
(3) And (3) stabilizing heat treatment:
and after the cold-rolled finished product is cleaned and processed to the target thickness (the thickness is 0.6-1.2mm or other thicknesses specified by a customer), transferring to an air annealing process. The furnace temperature was raised to 300 ℃ for 3h and the hold started. After the temperature of the material reaches 210 +/-5 ℃, the temperature of furnace gas is set to 230 ℃ and the temperature is kept for 2 hours.
After the heat preservation time of 2 hours is up, closing the heating system, and opening a fan in the furnace for forced cooling; discharging the materials when the temperature of the materials is less than or equal to 200 ℃, and transferring the materials to an air cooling area for rapid cooling.
The 5050 aluminum alloy obtained after the heat treatment process of example 1 was used to test its properties, and the results are shown in table 1.
TABLE 1
| Manufacturer of the product | Number plate | Status of state | Tensile strength | Yield strength | Elongation percentage | Brinell hardness |
| Domestic peer | 5052 | H32 | 200-240 | 165-175 | ≥10％ | ≥40 |
| The people in Xinjiang province | 5050 | H34 | 200-220 | 160-170 | ≥10％ | ≥40 |
As can be seen from table 1, the heat treatment process of the present invention can effectively and stably improve the formability of the product to the same level as that of 5052 aluminum alloy for 3C electronic housings.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (7)
1. A5050 aluminum alloy heat treatment process is characterized by comprising the following steps:
(1) homogenizing heat treatment: cleaning the 5050 aluminum alloy coiled material after cold rolling, quickly heating to 270 +/-5 ℃, preserving heat for 8 hours, and then air cooling;
(2) carrying out semi-finished product cold rolling and finished product cold rolling treatment on the 5050 aluminum alloy coiled material subjected to air cooling;
(3) and (3) stabilizing heat treatment: cleaning the 5050 aluminum alloy coiled material after the cold rolling of the finished product, quickly heating to 200-220 ℃, and keeping the temperature for no more than 2 h; then keeping the temperature at 220 ℃ and 230 ℃ for 2-3h, and then cooling by air;
wherein the total time of the rapid temperature rise to 200-220 ℃ and the heat preservation at 200-220 ℃ is less than 4 h.
2. The thermal processing process according to claim 1,
in the step (1): the homogenization heat treatment was performed in a nitrogen atmosphere.
3. The thermal processing process according to claim 1,
in the step (1): the thickness of the 5050 aluminum alloy coiled material after cold rolling is 3.5-4.0 mm.
4. The thermal processing process according to claim 1,
in the step (1): and (4) air cooling until the temperature of the workpiece does not exceed 150 ℃, and discharging.
5. The thermal processing process according to claim 1,
in the step (3): the stabilization heat treatment is performed in an air atmosphere.
6. The thermal processing process according to claim 1,
the thickness of the 5050 aluminum alloy coiled material after the cold rolling of the finished product in the step (3) is 0.6-1.2 mm.
7. The thermal processing process according to claim 1,
in the step (3), air cooling is carried out within 2h until the temperature of the workpiece is less than 200 ℃.
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2020
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| JP2011179094A (en) * | 2010-03-03 | 2011-09-15 | Nippon Light Metal Co Ltd | Aluminum alloy sheet and method for producing the same |
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