CN115961224B - Stabilization treatment process for scandium-containing aluminum alloy plate - Google Patents
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Abstract
The invention provides a stabilization treatment process for scandium-containing aluminum alloy plates, which comprises the following steps of: step 1, batching according to raw material components of the 5R60 aluminum alloy to obtain a mixed raw material; step 2, smelting and casting the mixed raw materials to obtain a flat ingot; step 3, rolling the 5R60 sheet material by using a large-roll-diameter hot rolling-cold rolling process to obtain a scandium-containing 5R60 cold-rolled sheet material; and 4, selecting different multistage stabilization treatment methods to perform stabilization heat treatment according to different application environments. In the invention, the deformation, the energy absorption characteristic and the strain rate of the impact process are different due to the difference of the anti-fragmentation and anti-detonation application environments, and the multistage stabilization treatment is performed pertinently based on the difference of penetration mechanisms. The 5R60 plate is subjected to multistage stabilization treatment, so that the inter-crystal corrosion resistance is improved, and the proper mechanical property is ensured to meet the requirements of fragment resistance and detonation penetration resistance.
Description
Technical Field
The invention relates to the field of aluminum alloy treatment, in particular to a stabilization treatment process for scandium-containing aluminum alloy plates.
Background
With the increasing complexity of battlefield environments, special military equipment is required to have rapid response global deployment characteristics, which puts higher demands on the lightweight and high maneuverability of the equipment. In addition, the omnibearing protection requirement of special equipment is more and more remarkable, and the special equipment is aimed at the threat of various bullets, explosives such as mines and the like. The 5R60 aluminum alloy plate material which takes the special military equipment car body and the land as application objects and has lower density and the functions of breaking resistance and detonation penetration resistance is generated. The 5R60 aluminum alloy plate is a 5XXX series aluminum alloy material with independent intellectual property which is newly developed by the national institute of Mongolian metal materials of Chinese weapon science and Henan Wanday aluminum industry Co-Ltd, and is widely applied to the manufacturing of equipment such as various aluminum vehicle bodies, tower bodies, ships and the like at present. Aiming at the problem that when the 5XXX aluminum alloy is in long-term service at room temperature, continuous beta phase is precipitated along grain boundaries to cause serious intergranular corrosion and stress corrosion, the beta phase is uniformly distributed in grains by carrying out stabilization treatment (low-temperature annealing treatment) on a cold-rolled sheet in the prior art, a continuous network structure distributed at the grain boundaries is avoided, and the intergranular corrosion resistance of the sheet is finally improved. However, the stabilization process tends to result in reduced mechanical properties of the sheet material, which increases the risk of failure of the sheet material under high-speed impact conditions of burst and detonation prevention. Therefore, the requirement of a 5R60 aluminum alloy plate stabilization treatment process for improving the intergranular corrosion resistance and ensuring the mechanical property to meet the requirements of anti-fragmentation and anti-detonation is urgent.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a scandium-containing 5R60 multistage stabilization treatment process which ensures alloy strength and has excellent long-term corrosion resistance, and excellent fragment and detonation penetration resistance.
The aim of the invention is realized by adopting the following technical scheme:
a stabilization treatment process for scandium-containing aluminum alloy sheet, comprising the steps of:
step 1, batching according to raw material components of the 5R60 aluminum alloy to obtain a mixed raw material;
step 2, smelting and casting the mixed raw materials to obtain a flat ingot;
step 3, rolling the 5R60 sheet material by using a large-roll-diameter hot rolling-cold rolling process to obtain a scandium-containing 5R60 cold-rolled sheet material;
and 4, selecting different multistage stabilization treatment methods according to different application environments of the anti-fragmentation and anti-detonation penetration, and performing stabilization heat treatment on the scandium-containing 5R60 cold-rolled plate obtained in the step 3.
Preferably, in the step 1, the raw material components of the 5R60 aluminum alloy include, by mass:
mg:5.3 to 6.5 weight percent, mn:0.60 to 1.20 weight percent of Zn:0.5 to 1.1 weight percent of Zr:0.03 to 0.18 weight percent, sc:0.02 to 0.13 weight percent, ti:0.02 to 0.06 weight percent, less than or equal to 0.15 weight percent of Cu, less than or equal to 0.25 weight percent of Fe, less than or equal to 0.20 weight percent of Si, and the balance of Al and unavoidable impurities, wherein the content of single impurities is less than or equal to 0.05 weight percent, and the total content of the impurities is less than or equal to 0.15 weight percent.
Preferably, in the step 2, the smelting temperature is 680-740 ℃, and after the smelting temperature reaches 720 ℃, the temperature is kept and the mixture is kept stand for 30-50 min.
Preferably, in the step 2, the casting temperature is 670 ℃ to 690 ℃.
Preferably, in the step 3, the scandium-containing 5R60 cold-rolled sheet has a thickness of 5 to 40mm.
Preferably, in the step 3, the hot rolling-cold rolling process with large roll diameter includes:
s1, carrying out recrystallization annealing treatment on a flat ingot at the temperature of 250-400 ℃ for 30-150 min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the ratio of the large-diameter sheet to the large-diameter sheet is 10-125, and the final deformation is 10% -70% after multi-pass cold rolling.
More preferably, in the step S2, the roll diameter of the roll is 600 to 2000mm, and the thickness of the flat ingot is 16 to 68mm.
Preferably, in the step 3, if the 5R60 sheet material is used for preventing the impact of broken sheets, the stabilizing heat treatment is a high-temperature-low-temperature two-stage stabilizing treatment, wherein the temperature of the high-temperature treatment is 250-350 ℃ and the time is 0.5-1 h; the temperature of the low-temperature treatment is 100-120 ℃ and the time is 1-3 h.
Preferably, in the step 3, if the 5R60 sheet material is used for detonation penetration prevention, the stabilizing heat treatment is a first low temperature-high temperature-second low temperature three-stage stabilizing treatment, wherein the temperature of the first low temperature treatment is 140-150 ℃ and the time is 0.5-2 h; the temperature of the high-temperature treatment is 250-350 ℃ and the time is 0.5-1 h; the temperature of the second low-temperature treatment is 120-140 ℃ and the time is 1-3 h.
The beneficial effects of the invention are as follows:
1. in the invention, the deformation, the energy absorption characteristic and the strain rate of the impact process are different due to the difference of the anti-fragmentation and anti-detonation application environments, and the multistage stabilization treatment is performed pertinently based on the difference of penetration mechanisms.
2. In the invention, the two-stage and three-stage stabilization treatment processes comprise high-temperature treatment at 250-350 ℃ for 0.5-1 h, because the Sc element in the 5R60 alloy and the elements such as Al, zr and the like form nano-scale dispersion strengthening phase Al with higher thermal stability 3 Sc、Al 3 (Sc, zr) can raise the recrystallization starting temperature of the cold-rolled sheet and expand the range of stabilizing treatment temperature interval. In addition Al 3 Sc、Al 3 The (Sc, zr) is not only dissolved and grown in the stabilizing treatment process, but also a large amount of nano particles are precipitated in a short time in the atmosphere of 250-350 ℃, and the nano particles and the matrix are in a coherent relation, so that the movement of grain boundaries and dislocation are blocked, and the mechanical property is improved. In addition, the low-temperature treatment after the high-temperature treatment mainly changes the precipitation position and distribution form of beta-phase particles, and controls the discontinuous precipitation of beta-phase in a crystal boundary, thereby improving the intergranular corrosion resistance of the alloy.
3. In the three-stage stabilization treatment system, a first stage treatment with a higher temperature than the third stage treatment is arranged before the high temperature treatment, which is mainly to make the T-phase Mg with a higher temperature 32 (Al,Zn) 49 Preferentially separating out, and pinning defects such as dislocation, thereby enhancing the yield strength and detonation of the alloyThe penetration process is accompanied by a larger strain rate, and the first-stage treatment obviously improves the yield strength, so that the high-speed impact resistance of the 5R60 plate is greatly improved.
4. The 5R60 plate is subjected to multistage stabilization treatment, so that the inter-crystal corrosion resistance is improved, and the proper mechanical property is ensured to meet the requirements of fragment resistance and detonation penetration resistance.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a scanning and detecting image of a scandium-containing 5R60 plate material after the stabilization treatment according to example 1 of the present invention;
FIG. 2 is a scanning electron microscope image of a scandium-containing 5R60 plate material after the stabilization treatment according to comparative example 1 of the present invention.
Detailed Description
The technical features, objects and advantages of the present invention will be more clearly understood from the following detailed description of the technical aspects of the present invention, but should not be construed as limiting the scope of the invention.
The starting materials, reagents or apparatus used in the following examples are all available from conventional commercial sources or may be obtained by methods known in the art unless otherwise specified.
In the present invention, the large roll diameter plate thickness ratio refers to the ratio of the roll diameter of the roll to the plate thickness of the flat ingot.
The invention will be further described with reference to the following examples.
Example 1
A stabilization treatment process for scandium-containing aluminum alloy sheet, comprising the steps of:
step 1, proportioning raw materials of 5R60 aluminum alloy, wherein the 5R60 aluminum alloy comprises the following components in percentage by mass:
mg:5.3wt%, mn:0.60wt%, zn:0.5wt%, zr:0.03wt%, sc:0.02wt%, ti:0.02wt%, cu:0.10wt%, fe:0.10wt%, si:0.15wt%, unavoidable impurities, a single impurity content of 0.05wt%, total impurities of 0.10wt%, and the balance of Al.
Step 2, smelting the mixed raw materials, keeping the smelting temperature at 740 ℃, keeping the temperature at 720 ℃ and standing for 40min, and casting at 680 ℃ to obtain a flat ingot;
step 3, rolling the sheet by utilizing a specific large-roller-diameter hot rolling-cold rolling process of the 5R60 sheet to obtain a scandium-containing 5R60 cold-rolled sheet with the thickness of 20 mm;
and 4, performing stabilization heat treatment on the scandium-containing 5R60 cold-rolled sheet obtained in the step 3, wherein a high-temperature and low-temperature two-stage stabilization treatment system is selected for the 5R60 sheet for preventing breakage, and specifically, the high temperature (250 ℃ multiplied by 0.5 h) +the low temperature (100 ℃ multiplied by 1 h).
In the step 3, the hot rolling-cold rolling process with large roller diameter comprises the following steps:
s1, carrying out recrystallization annealing treatment on the flat cast ingot at the temperature of 300 ℃ for 120min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the large-roll-diameter sheet thickness ratio is 40, and after multi-pass cold rolling, the final deformation is 50%; the roller diameter of the adopted roller is 1600mm, and the thickness of the flat cast ingot is 40mm.
Example 2
A stabilization treatment process for scandium-containing aluminum alloy sheet, comprising the steps of:
step 1, proportioning raw materials of 5R60 aluminum alloy, wherein the 5R60 aluminum alloy comprises the following components in percentage by mass:
mg:6.5wt%, mn:1.20wt%, zn: 1.1wt%, zr:0.18wt%, sc:0.13wt%, ti:0.06wt%, cu:0.10wt%, fe:0.20wt%, si:0.10wt% of unavoidable impurities, 0.05wt% of single impurities, 0.15wt% of total impurities, and the balance of Al.
Step 2, smelting the mixed raw materials, keeping the smelting temperature at 680 ℃, keeping the temperature at 720 ℃ and standing for 30min, and casting at 690 ℃ to obtain a flat ingot;
step 3, rolling the sheet by utilizing a specific large-roller-diameter hot rolling-cold rolling process of the 5R60 sheet to obtain a 40mm scandium-containing 5R60 cold-rolled sheet;
and 4, performing stabilization heat treatment on the scandium-containing 5R60 cold-rolled sheet obtained in the step 3, wherein a low-temperature-high-temperature three-stage stabilization treatment system is selected for the detonation-resistant 5R60 sheet, specifically, the first low temperature (140 ℃ multiplied by 2 h) +high temperature (250 ℃ multiplied by 1 h) +the second low temperature (140 ℃ multiplied by 2 h).
In the step 3, the hot rolling-cold rolling process with large roller diameter comprises the following steps:
s1, carrying out recrystallization annealing treatment on the flat cast ingot at the temperature of 350 ℃ for 60min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the large-roll-diameter sheet thickness ratio is 30, and after multi-pass cold rolling, the final deformation is 33%; the roller diameter of the adopted roller is 1800mm, and the thickness of the flat cast ingot is 60mm.
Example 3
A stabilization treatment process for scandium-containing aluminum alloy sheet, comprising the steps of:
step 1, proportioning raw materials of 5R60 aluminum alloy, wherein the 5R60 aluminum alloy comprises the following components in percentage by mass:
mg:6wt%, mn:1wt%, zn:0.7wt%, zr:0.1wt%, sc:0.1wt%, ti:0.04wt%, cu: 0.05wt%, fe:0.1wt%, si:0.1wt% of unavoidable impurities, 0.05wt% of single impurities, 0.1wt% of total impurities, and the balance of Al.
Step 2, smelting the mixed raw materials, keeping the smelting temperature at 700 ℃, keeping the temperature at 720 ℃ and standing for 40min, and casting at 675 ℃ to obtain a flat cast ingot;
step 3, rolling the sheet by utilizing a specific large-roller-diameter hot rolling-cold rolling process of the 5R60 sheet to obtain a 30mm scandium-containing 5R60 cold-rolled sheet;
and 4, performing stabilization heat treatment on the obtained scandium-containing 5R60 cold-rolled sheet, wherein the 5R60 sheet for detonation penetration prevention is selected from a low-temperature-high-temperature three-stage stabilization treatment system, specifically a first low temperature (150 ℃ multiplied by 0.5 h) +a high temperature (300 ℃ multiplied by 0.75 h) +a second low temperature (120 ℃ multiplied by 4 h).
In the step 3, the hot rolling-cold rolling process with large roller diameter comprises the following steps:
s1, carrying out recrystallization annealing treatment on the flat cast ingot at the temperature of 350 ℃ for 60min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the large-roll-diameter sheet thickness ratio is 30, and after multi-pass cold rolling, the final deformation is 40%; the roller diameter of the adopted roller is 1500mm, and the thickness of the flat cast ingot is 50mm.
Example 4
A stabilization treatment process for scandium-containing aluminum alloy sheet, comprising the steps of:
step 1, proportioning raw materials of 5R60 aluminum alloy, wherein the 5R60 aluminum alloy comprises the following components in percentage by mass:
mg:5.5wt%, mn:0.81wt%, zn:0.65wt%, zr:0.1wt%, sc:0.11wt%, ti:0.04wt%, cu:0.08wt%, fe:0.11wt%, si:0.10wt% of unavoidable impurities, 0.05wt% of single impurities, 0.15wt% of total impurities, and the balance of Al.
Step 2, smelting the mixed raw materials, keeping the smelting temperature at 720 ℃, keeping the temperature at 720 ℃ and standing for 50min, and casting at 670 ℃ to obtain a flat ingot;
step 3, rolling the sheet by utilizing a specific large-roller-diameter hot rolling-cold rolling process of the 5R60 sheet to obtain a 5mm scandium-containing 5R60 cold-rolled sheet;
and 4, performing stabilization heat treatment on the scandium-containing 5R60 cold-rolled plate obtained in the step 3, wherein the 5R60 plate for preventing broken sheet impact is subjected to a high-temperature and low-temperature two-stage stabilization treatment system, and specifically high temperature (280 ℃ multiplied by 0.5 h) +low temperature (120 ℃ multiplied by 3 h).
In the step 3, the hot rolling-cold rolling process with large roller diameter comprises the following steps:
s1, carrying out recrystallization annealing treatment on the flat cast ingot at the temperature of 350 ℃ for 60min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the ratio of the large-diameter sheet to the large-diameter sheet is 100, and the final deformation is 50% after multi-pass cold rolling; the roller diameter of the adopted roller is 1000mm, and the thickness of the flat cast ingot is 10mm.
Example 5
A stabilization treatment process for scandium-containing aluminum alloy sheet, comprising the steps of:
step 1, proportioning raw materials of 5R60 aluminum alloy, wherein the 5R60 aluminum alloy comprises the following components in percentage by mass:
mg:6.3wt%, mn:1.0wt%, zn:0.75wt%, zr:0.15wt%, sc:0.12wt%, ti:0.06wt%, cu:0.15wt%, fe:0.15wt%, si:0.10wt% of unavoidable impurities, 0.05wt% of single impurities, 0.10wt% of total impurities, and the balance of Al.
Step 2, smelting the mixed raw materials, wherein the smelting temperature is 730 ℃, the temperature is kept at 720 ℃, the mixed raw materials stand for 30 minutes, and a flat cast ingot is obtained by casting at 670 ℃;
step 3, rolling the sheet by utilizing a specific large-roller-diameter hot rolling-cold rolling process of the 5R60 sheet to obtain a 34mm scandium-containing 5R60 cold-rolled sheet;
and 4, performing stabilization heat treatment on the scandium-containing 5R60 cold-rolled sheet obtained in the step 3, wherein a low-temperature-high-temperature three-stage stabilization treatment system is selected for the detonation-resistant 5R60 sheet, specifically, the first low temperature (145 ℃ multiplied by 1 h) +the high temperature (350 ℃ multiplied by 0.5 h) +the second low temperature (120 ℃ multiplied by 3 h).
In the step 3, the hot rolling-cold rolling process with large roller diameter comprises the following steps:
s1, carrying out recrystallization annealing treatment on the flat cast ingot at the temperature of 350 ℃ for 60min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the large-roll-diameter sheet thickness ratio is 22, and after multi-pass cold rolling, the final deformation is 50%; the roller diameter of the adopted roller is 1500mm, and the thickness of the flat cast ingot is 68mm.
Example 6
A stabilization treatment process for scandium-containing aluminum alloy sheet, comprising the steps of:
step 1, proportioning raw materials of a 5R60 aluminum alloy, wherein the 5R60 aluminum alloy comprises the following components in percentage by mass:
mg:5.8wt%, mn:0.6wt%, zn:0.5wt%, zr:0.1wt%, sc:0.11wt%, ti:0.03wt%, cu:0.15wt%, fe:0.15wt%, si:0.20wt%, unavoidable impurities, a single impurity content of 0.05wt%, total impurities of 0.15wt%, and the balance Al.
Step 2, smelting the mixed raw materials, keeping the smelting temperature at 700 ℃, keeping the temperature at 720 ℃ and standing for 40min, and casting at 690 ℃ to obtain a flat ingot;
step 3, rolling the sheet by utilizing a specific large-roller-diameter hot rolling-cold rolling process of the 5R60 sheet to obtain a 15mm scandium-containing 5R60 cold-rolled sheet;
and 4, performing stabilization heat treatment on the scandium-containing 5R60 cold-rolled plate obtained in the step 3, wherein the 5R60 plate for preventing the broken sheet impact is selected from a high-temperature and low-temperature two-stage stabilization treatment system, and specifically, the high temperature (350 ℃ multiplied by 1 h) +the low temperature (110 ℃ multiplied by 2 h).
In the step 3, the hot rolling-cold rolling process with large roller diameter comprises the following steps:
s1, carrying out recrystallization annealing treatment on the flat cast ingot at the temperature of 350 ℃ for 60min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the large-roll-diameter sheet thickness ratio is 50, and after multi-pass cold rolling, the final deformation is 50%; the roller diameter of the adopted roller is 1500mm, and the thickness of the flat cast ingot is 30mm.
Comparative example 1
A stabilization treatment process for scandium-containing aluminum alloy sheet, the same as in example 1, except that the stabilization heat treatment was replaced with a stabilization annealing treatment: the temperature is 100-150 ℃ and the time is 1-5 h.
Comparative example 2
A stabilization treatment process for scandium-containing aluminum alloy sheet, the same as in example 2, except that the stabilization heat treatment was replaced with a stabilization annealing treatment: the temperature is 100-150 ℃ and the time is 1-5 h.
Comparative example 3
A stabilization treatment process for scandium-containing aluminum alloy sheet, the same as in example 3, except that the stabilization heat treatment was replaced with a stabilization annealing treatment: the temperature is 100-150 ℃ and the time is 1-5 h.
Comparative example 4
A stabilization treatment process for scandium-containing aluminum alloy sheet, the same as in example 4, except that the stabilization heat treatment was replaced with a stabilization annealing treatment: the temperature is 100-150 ℃ and the time is 1-5 h.
Comparative example 5
A stabilization treatment process for scandium-containing aluminum alloy sheet, the same as in example 5, except that the stabilization heat treatment was replaced with a stabilization annealing treatment: the temperature is 100-150 ℃ and the time is 1-5 h.
Comparative example 6
A stabilization treatment process for scandium-containing aluminum alloy sheet, the same as in example 6, except that the stabilization heat treatment was replaced with a stabilization annealing treatment: the temperature is 100-150 ℃ and the time is 1-5 h.
Experimental example
1. The scandium-containing 5R60 sheet material after the stabilization treatment prepared in example 1 and comparative example 1 was subjected to scanning detection as shown in fig. 1 and 2. Wherein, fig. 1 is example 1, fig. 2 is comparative example 1, it can be seen that the multistage stabilized precipitated phase of example 1 is in a short rod shape and is more closely arranged; comparative example 1 the single-stage stabilized precipitate phase was in the form of long rods and was relatively loosely arranged.
2. The performance of the samples of the examples and the comparative examples is tested, the processing and the detection of the samples for the tensile test are carried out according to the national standard GB/T16865-2013, and the processing and the detection of the samples for the intergranular corrosion test are carried out according to the national standard GB/T7998-2005.
Wherein, the cold rolling state refers to a plate which is not subjected to stabilizing heat treatment; the stabilized state refers to a sheet material subjected to a stabilizing heat treatment.
According to the analysis of the test result, after the multistage stabilization treatment of the invention, the tensile strength (R m ) The colder rolled state is not obviously reduced, the elongation (A) after fracture is obviously increased, and the intergranular corrosion resistance is obviously improved; stability compared with single poleChemical annealing treatment, tensile Strength (R) m ) And the elongation after fracture (A) and the intergranular corrosion resistance are improved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.
Claims (5)
1. A stabilizing treatment process for scandium-containing aluminum alloy sheet, characterized by comprising the steps of:
step 1, batching according to raw material components of the 5R60 aluminum alloy to obtain a mixed raw material;
step 2, smelting and casting the mixed raw materials to obtain a flat ingot;
step 3, rolling the 5R60 sheet material by using a large-roll-diameter hot rolling-cold rolling process to obtain a scandium-containing 5R60 cold-rolled sheet material;
step 4, performing stabilization heat treatment on the scandium-containing 5R60 cold-rolled sheet obtained in the step 3, wherein the stabilization heat treatment is a first low-temperature-high-temperature-second low-temperature three-stage stabilization treatment, and the temperature of the first low-temperature treatment is 140-150 ℃ and the time is 0.5-2 h; the temperature of the high-temperature treatment is 250-350 ℃ and the time is 0.5-1 h; the temperature of the second low-temperature treatment is 120-140 ℃ and the time is 1-3 h;
in the step 1, the raw material components of the 5R60 aluminum alloy comprise the following components in percentage by mass:
mg:5.3 to 6.5 weight percent, mn:0.60 to 1.20 weight percent of Zn:0.5 to 1.1 weight percent of Zr:0.03 to 0.18 weight percent, sc:0.02 to 0.13 weight percent, ti:0.02 to 0.06 weight percent, less than or equal to 0.15 weight percent of Cu, less than or equal to 0.25 weight percent of Fe, less than or equal to 0.20 weight percent of Si, and the balance of Al and unavoidable impurities, wherein the content of single impurities is less than or equal to 0.05 weight percent, and the total content of the impurities is less than or equal to 0.15 weight percent;
in the step 3, the hot rolling-cold rolling process with large roller diameter comprises the following steps:
s1, carrying out recrystallization annealing treatment on a flat ingot at the temperature of 250-400 ℃ for 30-150 min to obtain a pretreated plate;
s2, performing cold rolling treatment on the pretreated sheet material obtained in the step S1, wherein the ratio of the large-diameter sheet to the large-diameter sheet is 10-125, and the final deformation is 10% -70% after multi-pass cold rolling;
the large roll diameter plate thickness ratio refers to the ratio of the roll diameter of the roll to the plate thickness of the flat ingot.
2. The stabilizing treatment process for scandium-containing aluminum alloy sheet according to claim 1, wherein in the step 2, the melting temperature is 680-740 ℃, and after 720 ℃, the aluminum alloy sheet is kept at a constant temperature for 30-50 min.
3. A stabilization process for scandium-containing aluminium alloy sheets according to claim 1, characterised in that in step 2 the casting temperature is 670-690 ℃.
4. The stabilizing treatment process for scandium-containing aluminum alloy sheet according to claim 1, wherein in said step 3, the scandium-containing 5R60 cold-rolled sheet has a thickness of 5 to 40mm.
5. The stabilizing treatment process for scandium-containing aluminum alloy sheets according to claim 1, wherein in S2, the roller diameter of the adopted roller is 600-2000 mm, and the thickness of the flat cast ingot is 16-68 mm.
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