CN109371266B - Production method of high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material - Google Patents
Production method of high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material Download PDFInfo
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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- C22F1/043—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 silicon as the next major constituent
Abstract
The invention discloses a production method of a high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material, belonging to the technical field of aluminum alloy, wherein the Al-Mg-Si series alloy comprises the following chemical components in percentage by weight: si: 1.4-1.8%, Fe: 0.4-0.8%, Cu: 0.1-0.2%, Mn: 0.6-1.5%, Mg: 0.7-1.3%, Cr: less than or equal to 0.2 percent, Zn: less than or equal to 0.1 percent, Ti: less than or equal to 0.15 percent, the balance of Al, the sum of the components being 100 percent, and the mass ratio of Mn/Fe being controlled to be 1.3-2.5; the production method comprises the following steps: smelting, ingot casting homogenization treatment, hot extrusion, quenching and aging, wherein the ingot casting homogenization treatment comprises the following steps: heating the cast ingot to 530-570 ℃, preserving heat for 1-10 h, then cooling to 400-450 ℃ at a speed of not more than 10 ℃/min, and then cooling to below 180 ℃ at a speed of not less than 30 ℃/min and discharging. The invention produces the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material by improving the alloy components and the production process.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy, and particularly relates to a production method of a high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material.
Background
Although the strength of the Al-Mg-Si alloy is generally 300MPa, due to the excellent corrosion resistance and processing and forming performance, the Al-Mg-Si alloy can be used for manufacturing extruded materials with complex sections by adopting an extrusion method, and is widely applied to manufacturing of aerospace, ground transportation, buildings and lightweight equipment. In order to achieve the purposes of high efficiency, energy conservation and environmental protection, the trend of light weight of vehicles is more and more paid attention, so that the development of Al-Mg-Si alloy with higher strength is of great significance on the premise of keeping the corrosion resistance, weldability and formability of the Al-Mg-Si alloy.
At present, in order to improve the strength of Al-Mg-Si series aluminum alloy, the following technical scheme is mainly adopted: based on the aluminum alloy second phase strengthening theory, the contents of Mg, Si, Mn and Cu in the Al-Mg-Si series aluminum alloy are improved, and as shown in the table 1, the alloy in the table 1 can be divided into three types:
TABLE 1 common Al-Mg-Si series alloy composition design
(1) 6063, 6082 type alloys with low copper content (Cu element is taken as impurity element, not more than 0.1 wt.%), and based on the most typical 6063 alloy in Al-Mg-Si series alloys, the 6082 alloys obtain higher strength than 6063 alloys by improving the contents of Si, Mg and Mn elements.
(2) The 6061 and 6013 type alloy with medium copper content (Cu element is used as an alloying element, and the content is 0.15-0.7 wt.%) improves the strength by improving the content of Si, Mg, Mn and Cu elements, and has large Cu content fluctuation range and adjustable strength improvement degree.
(3) The 6111 and 6110 type alloy with high copper content (Cu is used as an alloying element, and the content is 0.5-1.1 wt.%) not only improves the strength by improving the content of Si, Mg, Mn and Cu, but also adds Cr and improves the allowable upper limit value of Zn element to further improve the strength.
The three types of Al-Mg-Si alloys have the common characteristic that the Fe element is treated according to impurities and only an upper limit value which is not allowed to be exceeded is specified. A large number of researches show that in Al-Mg-Si series alloy, the welding performance (such as welding strength coefficient) and the corrosion resistance (such as intergranular corrosion) are reduced while the strength is improved along with the increase of the content of Cu element, so that the application of the Al-Mg-Si series alloy is limited, particularly, the Al-Mg-Si series alloy has high comprehensive performance requirements on strength exceeding 400MPa (called high strength) and good corrosion resistance, weldability and processing formability, and 6 Al-Mg-Si series alloys in the table 1 can not meet the design requirements.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a production method of a high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material with optimized formula, simple process and low cost, so as to prepare the Al-Mg-Si series alloy with the strength of more than 400MPa and good corrosion resistance, weldability and processing formability.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a production method of a high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material, which comprises the following chemical components in percentage by weight: si: 1.4-1.8 wt.%, Fe: 0.4-0.8 wt.%, Cu: 0.1-0.2 wt.%, Mn: 0.6-1.5 wt.%, Mg: 0.7-1.3 wt.%, Cr: 0.2wt.%, Zn: less than or equal to 0.1 wt.%, Ti: not more than 0.15wt.%, the balance being Al, the sum of the weight percentages of the components being 100%, and the mass ratio of Mn/Fe being controlled to be 1.3-2.5;
the production method of the Al-Mg-Si series alloy extrusion material comprises the following steps: smelting, ingot casting homogenization treatment, hot extrusion, quenching and aging, wherein the ingot casting homogenization treatment comprises the following specific processes: heating the cast ingot to 530-570 ℃, preserving heat for 1-10 h, then cooling to 400-450 ℃ at a speed of not more than 10 ℃/min, and then cooling to below 180 ℃ at a speed of not less than 30 ℃/min and discharging.
Preferably, the mass ratio of Mn/Fe is 1.4 to 1.7.
Preferably, the content of Cr: 0.1 wt.% or less, Zn content: less than or equal to 0.05 wt.%, Ti content: less than or equal to 0.1 wt.%.
Preferably, the method for producing an extruded material of an Al — Mg — Si alloy includes the steps of:
(1) smelting: proportioning according to a set proportion, and smelting at a preset temperature;
(2) ingot casting: obtaining an aluminum alloy melt meeting the requirements through smelting, and preparing an ingot by adopting a semi-continuous ingot casting method;
(3) homogenizing cast ingots: heating the ingot to 530-570 ℃, preserving heat for 1-10 h, cooling to 400-450 ℃ at a speed of not more than 10 ℃/min, cooling to below 180 ℃ at a speed of not less than 30 ℃/min, discharging and naturally cooling to obtain a homogenized ingot;
(4) hot extrusion: heating the ingot obtained in the step (3) after homogenizing treatment to 480-530 ℃, wherein the temperature of an extrusion cylinder is 430-500 ℃, and the extrusion speed of an extrusion material is not more than 10 m/min;
(5) quenching: after flowing out of the die hole, the extruded material enters an online quenching device for quenching treatment;
(6) aging: heating the quenched extruded material to 100-200 ℃ within 8h, preserving heat for 1-48 h for aging treatment, and discharging to obtain the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extruded material.
Preferably, in the step (1), the melting temperature is 720-760 ℃, and the standing temperature is 720-740 ℃.
Preferably, in the step (2), the casting temperature is 720-740 ℃.
Preferably, in the step (3), the ingot is heated to 550 ℃ and kept at the temperature for 4h, and then cooled to 400 ℃ at the speed of 5 ℃/min, and then cooled to 100 ℃ at the speed of 60 ℃/min to be discharged.
Preferably, in the step (4), the ingot is heated to 500 ℃, the temperature of the extrusion container is 480 ℃, and the extrusion speed of the extrusion material is 6 m/min.
Preferably, in the step (5), the quenching cooling medium is one or more of water, water mist and wind.
Preferably, in the step (5), the quenching cooling medium is water.
Preferably, in the step (6), the aging treatment is carried out by heating to 170 ℃ and keeping the temperature for 9 h.
The invention relates to a production method of a high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material, which researches the influence of elements such as Mg, Si, Fe, Mn, Cu and the like on the structure and the performance of an Al-Mg-Si series alloy, combines the production process flow of the Al-Mg-Si series alloy extrusion material in industrial production, and provides the production method of the high-strength corrosion-resistant weldable aluminum alloy extrusion material. At present, most of aluminum alloys have Fe element as impurity, while the invention takes Fe element as alloying element, optimizes the content and proportion, and further proves the regulation and control mechanism of the content of Si, Mg, Cu and Mn element and the proportion thereof in Al-Mg-Si series alloy to the organization and performance, comprising the following two aspects:
in terms of alloy composition:
the Fe content is 0.4-0.8 wt.%, which is the key point of the invention. For the prior art, Fe is an impurity element in most aluminum alloys, and the upper limit thereof needs to be strictly controlled. However, the research of the invention finds that in the process of solidifying the Al-Mg-Si series alloy, Fe element and excessive Si form a lamellar beta-AlFeSi nonequilibrium crystal phase; in the subsequent ingot homogenizing treatment process, due to the action of Mn element, the iron-rich phase beta-AlFeSi is subjected to beta → alpha phase transformation, so that the original coarse large lamellar non-equilibrium beta-AlFeSi phase is transformed into a granular alpha-AlFeMnSi phase, and is obviously refined, so that the alloy generates obvious dispersed phase strengthening, and the alloy strength is improved.
In the prior art, the content ratio of Mn to Fe in the Al-Mg-Si alloy is not limited, and the invention establishes the connection of Mn, Fe and other elements by the limitation, thereby reducing the difficulty of regulating the microstructure of the alloy by alloying elements, when the content of Fe is determined, the Mn content is too low or too high, which can cause adverse effect on the alloy, when the Mn content is too low, on one hand, in the finite time ingot homogenizing process, the β -AlFeSi phase can not fully generate β → α phase transformation, thereby not eliminating the adverse effect brought by β -AlFeSi phase, and on the other hand, although the alloy can still form part α -AlFeMnSi phase, the α -AlFeMnSi phase can not be fully refined, and is difficult to form submicron second phase particles, thereby affecting the strengthening effect of the dispersed phase, on the other hand, the Mn element plays a large part in the β → α phase transformation process, and is difficult to cause the high-refined effect when the Mn content is easily caused by the high-MnSi phase, thereby the alloy is easily subjected to be easily refined6The phase is agglomerated or coarsened, and the effects of recrystallization and grain growth inhibition are also difficult to achieve.
In the invention, the Cu content is 0.1-0.2 wt.%. In the prior art, the strength of Al-Mg-Si alloy is improved by a method of improving the Cu content, and the corrosion resistance and the weldability of the Al-Mg-Si alloy are poor. The Cu element generally forms a Q phase (AlMgSiCu) in the alloy and generates a continuous Cu-rich film at grain boundaries, and although the Cu-rich film with the continuous Q phase and the continuous grain boundaries can generate a large strengthening effect, the intergranular corrosion resistance and the welding crack tendency of the Cu-rich film are obviously improved. The present invention therefore limits the Cu element range to 0.1 to 0.2wt.%, which is preferable in view of simultaneously imparting high strength, corrosion resistance and weldability to the alloy.
In the components of the alloy, only upper limit values of Cr, Zn and Ti are regulated, and the alloy is optimized and designed based on the accumulation of impurity element content in the process of recycling the aluminum alloy for many times and the change of element content possibly caused by using a grain refiner containing Ti to generate certain adverse effects on the structure and the performance of the aluminum alloy.
(II) processing technology aspect:
the production method of the Al-Mg-Si series alloy extrusion material has the same process flow as the Al-Mg-Si series alloy extrusion material produced by the prior art, the smelting, ingot casting, hot extrusion, quenching and aging processes are also in the realizable range of the prior art, and the key point is that the ingot casting is homogenized. The ingot casting homogenizing treatment process comprises the following steps: heating the cast ingot to 530-570 ℃, preserving heat for 1-10 h, then cooling to 400-450 ℃ at a speed of not more than 10 ℃/min, and then cooling to below 180 ℃ at a speed of not less than 30 ℃/min and discharging.
The Al-Mg-Si alloy with the component range is easy to separate out Mg in the cooling process of the ingot casting homogenizing treatment process2Si phase, if the cooling rate is too low, Mg is precipitated2The Si phase is too much and can not be completely dissolved in the hot extrusion, so that the deformation resistance is increased, and the strength of the extruded material is reduced; if the cooling rate in the cooling process of the ingot homogenizing treatment process is too high, the ingot can crack, and the processing formability of the alloy is reduced, so that the cooling process of the ingot homogenizing treatment process is optimally designed.
In conclusion, the invention coordinates the contradiction between high strength and corrosion resistance, weldability and processing formability caused by the components and the structure of the Al-Mg-Si alloy through the improvement of alloy components and production process, and can produce the high-strength corrosion-resistant weldable Al-Mg-Si alloy extrusion material.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) the production method of the Al-Mg-Si series alloy extrusion material avoids adverse effects caused by Fe element by limiting the Mn/Fe ratio, thereby converting the impurity element Fe in the aluminum alloy into alloying elements.
(2) According to the production method of the Al-Mg-Si series alloy extrusion material, Fe and Si elements are used as alloying elements, so that the aluminum alloy can be prepared by electrolytic aluminum with high Fe and Si contents, and secondary aluminum resources with high Fe and Si impurity contents can be adopted, so that the raw material cost of the Al-Mg-Si series alloy is reduced, and a technical scheme is provided for efficient cyclic utilization of the aluminum alloy.
(3) The preparation process is simple, low in cost and easy to implement, and the processing formability and the strength of the aluminum alloy are ensured by optimally designing the ingot discharging cooling rate of the ingot homogenizing treatment process.
Drawings
FIG. 1 is a scanning electron micrograph of an ingot before homogenization treatment in example 1.
FIG. 2 is a scanning electron micrograph of an ingot after homogenization treatment in example 1.
FIG. 3 is a scanning electron microscope image of the high strength corrosion resistant weldable Al-Mg-Si alloy extrudate obtained in example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
The invention provides a production method of a high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material, which comprises the following chemical components in percentage by weight: si: 1.4-1.8 wt.%, Fe: 0.4-0.8 wt.%, Cu: 0.1-0.2 wt.%, Mn: 0.6-1.5 wt.%, Mg: 0.7-1.3 wt.%, Cr: 0.2wt.%, Zn: less than or equal to 0.1 wt.%, Ti: not more than 0.15wt.%, the balance being Al, the sum of the weight percentages of the components being 100%, and the mass ratio of Mn/Fe being controlled to be 1.3-2.5;
the production method of the Al-Mg-Si series alloy extruded material comprises the following steps:
(1) smelting: proportioning according to a set proportion, smelting at 720-760 ℃, and standing at 720-740 ℃;
(2) ingot casting: obtaining an aluminum alloy melt meeting the requirements through smelting, and preparing an ingot by adopting a semi-continuous ingot casting method, wherein the casting temperature is 720-740 ℃;
(3) homogenizing cast ingots: heating the ingot to 530-570 ℃, preserving heat for 1-10 h, cooling to 400-450 ℃ at a speed of not more than 10 ℃/min, cooling to below 180 ℃ at a speed of not less than 30 ℃/min, discharging and naturally cooling to obtain a homogenized ingot;
(4) hot extrusion: heating the ingot obtained in the step (3) after homogenizing treatment to 480-530 ℃, wherein the temperature of an extrusion cylinder is 430-500 ℃, and the extrusion speed of an extrusion material is not more than 10 m/min;
(5) quenching: after flowing out of the die hole, the extruded material enters an online quenching device for quenching treatment, and the quenching cooling medium is water;
(6) aging: heating the quenched extruded material to 100-200 ℃ within 8h, preserving heat for 1-48 h for aging treatment, and discharging to obtain the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extruded material.
In order to verify the advantages of the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material, the detection method adopted is as follows:
tensile property of the extruded material: performing detection analysis according to the GBT228.1-2010 metal material tensile test part 1 room temperature test method;
intergranular corrosion performance of an extruded material: detecting and analyzing according to the GB/T7998-2005 aluminum alloy intercrystalline corrosion determination method, wherein the lower the rating number is, the better the corrosion resistance is;
welding performance of the extruded material: carrying out MIG welding on extruded materials obtained in different embodiments under the same condition, taking a welding seam and a base material test piece, carrying out detection analysis according to GBT228.1-2010, and defining welding coefficients as follows:
the welding coefficient is the tensile strength of the welding seam sample/the tensile strength of the parent metal;
the higher the welding coefficient, the better the welding performance.
The scheme of the invention is further explained in the following with reference to the drawings and the embodiments, and the content of the invention which belongs to the prior art is not repeated.
Example 1
This example produces an extrudate with a wall thickness of 5mm (extrusion ratio of about 20) having a composition designed to: si: 1.4 wt.%, Fe: 0.4 wt.%, Cu: 0.1 wt.%, Mn: 0.6 wt.%, Mg: 0.7 wt.%, Cr: 0.1 wt.%, Zn: less than or equal to 0.05 wt.%, Ti: not more than 0.1 wt.%, the balance being Al, the sum of the weight percentages of the components being 100%, and Mn/Fe being 1.5;
the ingot casting homogenizing treatment process comprises the following steps: the ingot was heated to 530 ℃ and held for 10 hours, then cooled to 400 ℃ at a rate of 5 ℃/min, then cooled to 175 ℃ at a rate of 60 ℃/min, and taken out of the furnace, and the properties of the resulting extrudate are shown in Table 1.
Wherein, fig. 1 is a scanning electron microscope microstructure of the ingot before homogenization treatment in this embodiment, fig. 2 is a scanning electron microscope microstructure of the ingot after homogenization treatment in this embodiment, and fig. 3 is a scanning electron microscope microstructure of the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extruded material prepared in this embodiment.
As can be seen from FIG. 1, the second phase particles in the ingot before homogenization treatment are in a continuous skeleton shape, and the maximum size can reach 100 μm; as can be seen from fig. 2, after the homogenization treatment, the second phase particles evolve into granules or short rods and are significantly refined, the maximum size of the second phase particles is about 20 μm, and more submicron-sized particles can be seen, which is beneficial to further refining the second phase particles in the subsequent extrusion production process to form more submicron-sized second phase particles; as can be seen from the attached figure 3, after extrusion, the second phase particles in the extruded material are further refined, the maximum size is about 5 μm, and simultaneously, a large amount of dispersion-distributed submicron-sized second phase particles are generated, and the dispersion-distributed submicron-sized second phase particles can generate a remarkable dispersion strengthening effect and are beneficial to the mechanical property of the extruded material.
Example 2
This example produces an extrudate with a wall thickness of 5mm (extrusion ratio of about 20) having a composition designed to: si: 1.8 wt.%, Fe: 0.8 wt.%, Cu: 0.2wt.%, Mn: 1.5 wt.%, Mg: 1.3 wt.%, Cr: 0.1 wt.%, Zn: less than or equal to 0.05 wt.%, Ti: not more than 0.1 wt.%, the balance being Al, the sum of the weight percentages of the components being 100%, and Mn/Fe being 1.88;
the ingot casting homogenizing treatment process comprises the following steps: the ingot was heated to 570 ℃ and held for 1 hour, then cooled to 450 ℃ at a rate of 5 ℃/min, then cooled to below 175 ℃ at a rate of 60 ℃/min, and taken out of the furnace, and the properties of the resulting extrudate are shown in Table 1.
Example 3
This example produces an extrudate with a wall thickness of 5mm (extrusion ratio of about 20) having a composition designed to: si: 1.5 wt.%, Fe: 0.6 wt.%, Cu: 0.15wt.%, Mn: 0.85 wt.%, Mg: 1.0 wt.%, Cr: 0.1 wt.%, Zn: less than or equal to 0.05 wt.%, Ti: not more than 0.1 wt.%, the balance being Al, the sum of the weight percentages of the components being 100%, and Mn/Fe being 1.41;
the ingot casting homogenizing treatment process comprises the following steps: the ingot was heated to 550 ℃ and held for 4 hours, then cooled to 400 ℃ at a rate of 5 ℃/min, then cooled to 100 ℃ at a rate of 60 ℃/min, and taken out of the furnace, and the properties of the resulting extrudate are shown in Table 1.
Comparative example 1
This comparative example produced an extrudate with a wall thickness of 5mm (extrusion ratio of about 20) having a composition designed to: si: 1.5 wt.%, Fe: 0.4 wt.%, Cu: 0.15wt.%, Mn: 1.2 wt.%, Mg: 1.0 wt.%, Cr: 0.1 wt.%, Zn: less than or equal to 0.05 wt.%, Ti: less than or equal to 0.1 wt.%, the balance being Al, Mn/Fe being 3.0;
the ingot casting homogenizing treatment process comprises the following steps: the ingot was heated to 550 ℃ and held for 4 hours, then cooled to 400 ℃ at a rate of 5 ℃/min, then cooled to 100 ℃ at a rate of 60 ℃/min, and taken out of the furnace, and the properties of the resulting extrudate are shown in Table 1.
As can be seen from the above, the alloying elements of comparative example 1 all meet the requirement of claim 1, but the Mn/Fe ratio exceeds the range of 1.3 to 2.5 for Mn/Fe described in claim 1.
Comparative example 2
This comparative example produced an extrudate with a wall thickness of 5mm (extrusion ratio of about 20) having a composition designed to: si: 1.5 wt.%, Fe: 0.6 wt.%, Cu: 0.15wt.%, Mn: 0.85 wt.%, Mg: 1.0 wt.%, Cr: 0.1 wt.%, Zn: less than or equal to 0.05 wt.%, Ti: less than or equal to 0.1 wt.%, the balance being Al, and the ratio of Mn/Fe being 1.41;
the ingot casting homogenizing treatment process comprises the following steps: the ingot was heated to 550 ℃ and held for 4 hours, and then cooled to 100 ℃ at a rate of 5 ℃/min in a furnace, and the properties of the resulting extrudate are shown in Table 1.
As can be seen from the above, the alloying element content and Mn/Fe ratio of comparative example 2 are in accordance with claim 1, but the ingot homogeneous heat treatment process does not fall within the range of claim 1.
Comparative example 3
This comparative example produced an extrudate with a wall thickness of 5mm (extrusion ratio of about 20) having a composition designed to: si: 1.5 wt.%, Fe: 0.6 wt.%, Cu: 0.25 wt.%, Mn: 0.85 wt.%, Mg: 1.0 wt.%, Cr: 0.1 wt.%, Zn: less than or equal to 0.05 wt.%, Ti: less than or equal to 0.1 wt.%, the balance being Al, and the ratio of Mn/Fe being 1.41;
the ingot casting homogenizing treatment process comprises the following steps: the ingot was heated to 550 ℃ and held for 4 hours, then cooled to 400 ℃ at a rate of 5 ℃/min, then cooled to 100 ℃ at a rate of 60 ℃/min, and taken out of the furnace, and the properties of the resulting extrudate are shown in Table 1.
From the above, it can be seen that comparative example 3 does not conform to Cu as described in claim 1 except for Cu: and outside the range of 0.1-0.2 wt.%, the contents of the other alloy elements, the Mn/Fe ratio and the ingot homogenizing treatment process all meet the range of claim 1.
As can be seen from the data in the attached Table 1, the comprehensive performance of the strength, corrosion resistance and welding performance of the extruded material obtained in the example of the invention is obviously better than that of the comparative example.
TABLE 1 Properties of extruded Material obtained in examples 1 to 3 and comparative examples 1 to 3
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-described embodiments. Modifications and variations that may occur to those skilled in the art without departing from the spirit and scope of the invention are to be considered as within the scope of the invention.
Claims (10)
1. The production method of the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material is characterized in that the Al-Mg-Si series alloy comprises the following chemical components in percentage by weight: si: 1.4-1.8 wt.%, Fe: 0.4-0.8 wt.%, Cu: 0.1-0.2 wt.%, Mn: 0.6-1.5 wt.%, Mg: 0.7-1.3 wt.%, Cr: 0.2wt.%, Zn: less than or equal to 0.1 wt.%, Ti: not more than 0.15wt.%, the balance being Al, the sum of the weight percentages of the components being 100%, and the mass ratio of Mn/Fe being controlled to be 1.3-2.5;
the production method of the Al-Mg-Si series alloy extrusion material comprises the following steps: smelting, ingot casting homogenization treatment, hot extrusion, quenching and aging, wherein the ingot casting homogenization treatment comprises the following specific processes: heating the cast ingot to 530-570 ℃, preserving heat for 1-10 h, then cooling to 400-450 ℃ at a speed of not more than 10 ℃/min, and then cooling to below 180 ℃ at a speed of not less than 30 ℃/min and discharging.
2. The method for producing a high-strength corrosion-resistant weldable Al-Mg-Si-based alloy extrusion material according to claim 1, wherein the Mn/Fe mass ratio is 1.4 to 1.7.
3. The production method of a high-strength corrosion-resistant weldable Al-Mg-Si-based alloy extrusion material according to claim 1, wherein the Cr content: 0.1 wt.% or less, Zn content: less than or equal to 0.05 wt.%, Ti content: less than or equal to 0.1 wt.%.
4. The production method of the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material according to any one of claims 1 to 3, characterized by comprising the steps of:
(1) smelting: proportioning according to a set proportion, and smelting at a preset temperature;
(2) ingot casting: obtaining an aluminum alloy melt meeting the requirements through smelting, and preparing an ingot by adopting a semi-continuous ingot casting method;
(3) homogenizing cast ingots: heating the ingot to 530-570 ℃, preserving heat for 1-10 h, cooling to 400-450 ℃ at a speed of not more than 10 ℃/min, cooling to below 180 ℃ at a speed of not less than 30 ℃/min, discharging and naturally cooling to obtain a homogenized ingot;
(4) hot extrusion: heating the ingot obtained in the step (3) after homogenizing treatment to 480-530 ℃, wherein the temperature of an extrusion cylinder is 430-500 ℃, and the extrusion speed of an extrusion material is not more than 10 m/min;
(5) quenching: after flowing out of the die hole, the extruded material enters an online quenching device for quenching treatment;
(6) aging: heating the quenched extruded material to 100-200 ℃ within 8h, preserving heat for 1-48 h for aging treatment, and discharging to obtain the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extruded material.
5. The production method of the high-strength corrosion-resistant weldable Al-Mg-Si series alloy extrusion material as claimed in claim 4, wherein in the step (1), the melting temperature is 720-760 ℃, and the standing temperature is 720-740 ℃.
6. The method for producing a high-strength corrosion-resistant weldable Al-Mg-Si-based alloy extrudate according to claim 4, wherein the casting temperature in step (2) is 720-740 ℃.
7. The production process of a high-strength corrosion-resistant weldable Al-Mg-Si-based alloy extrudate according to claim 4, wherein in the step (3), the ingot is heated to 550 ℃ and kept at the temperature for 4 hours, then cooled to 400 ℃ at a rate of 5 ℃/min, and then cooled to 100 ℃ at a rate of 60 ℃/min, and then discharged.
8. The method for producing a high-strength corrosion-resistant weldable Al-Mg-Si-based alloy extrudate according to claim 4, wherein in the step (4), the ingot is heated to 500 ℃, the temperature of the extrusion cylinder is 480 ℃, and the extrusion rate of the extrudate is 6 m/min.
9. The production method of the high-strength corrosion-resistant weldable Al-Mg-Si-based alloy extruded material according to claim 4, wherein in the step (5), the quenching cooling medium is one or more of water, water mist and wind.
10. The method for producing a high strength corrosion resistant weldable Al-Mg-Si series alloy extrudate according to claim 4 wherein in step (6) the extrudate is heated to 170 ℃ and held for 9 hours for aging.
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