Method for manufacturing wire rod for aluminum alloy fastener, wire rod, fastener, and assembly

Abstract

The invention discloses a manufacturing method of a wire rod for an aluminum alloy fastener, the wire rod, the fastener and an assembly, and the manufacturing method comprises the following steps: S1, weighing pure metal or intermediate alloy as a raw material according to the composition content of an aluminum alloy, adding the weighed raw material into a smelting furnace for heating and melting, stirring at the temperature of 720-750 DEG C, slagging off, degassing, refining and then carrying out semi-continuous casting to obtain an aluminum alloy cast ingot; the method comprises the following steps: S1, preparing an aluminum alloy ingot, S2, turning the aluminum alloy ingot, preheating, and carrying out hot continuous rolling to obtain a hot continuous rolling wire, S3, carrying out primary drawing on the hot continuous rolling wire to obtain a primary drawing wire, carrying out annealing treatment, and carrying out secondary drawing treatment after annealing to obtain a cold heading and drawing wire, and S4, carrying out T6 treatment on the obtained cold heading and drawing wire to obtain a T6-state wire. According to the method, the secondary cold drawing deformation amount is increased for the 6XXX series aluminum alloy, so that the mechanical property of the wire after T6 heat treatment is improved, the tightening torque of a later fastener is favorably improved, the load is ensured, and the reliability of a bolt is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a manufacturing method of a wire for a 6XXX aluminum alloy fastener, a wire, a fastener and an assembly. Background Art

[0002] At present, the preparation methods of aluminum alloy wire coils in China include continuous casting and rolling, extrusion + drawing, hot rolling + drawing, etc. The continuous casting and rolling process can only produce low- and medium-strength aluminum alloy wires / bars; the extrusion + drawing process is limited by the length of the extrusion barrel and the extrusion ratio, and cannot meet the requirements of coils above 30kg, and there is a problem of uneven organization and performance; while hot rolling can produce large coils with high strength and uniform organization, and is currently the best process for producing high-performance wires.

[0003] At present, the delivery state of aluminum alloy cold heading wire for fasteners is H12 or H13. In this state, the performance of the alloy can be improved after T6 treatment after cold heading, and there may be problems with the difficulty of cold heading processing.

[0004] Therefore, in view of the above technical problems, it is necessary to provide a manufacturing method, wire, fastener and assembly for 6XXX aluminum alloy fasteners.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a method for manufacturing a wire for a 6XXX aluminum alloy fastener, a wire, a fastener and an assembly.

[0007] In order to achieve the above object, a technical solution provided by a specific embodiment of the present invention is as follows:

[0008] A method for manufacturing a 6XXX aluminum alloy fastener wire comprises the following steps:

[0009] A1. Pure metal or intermediate alloy is weighed as raw material according to the composition content of aluminum alloy, the weighed raw material is added into a smelting furnace for heating and melting, stirred, slag-scraped, degassed and refined at 720°C to 750°C, and then semi-continuously cast to obtain an aluminum alloy ingot, wherein the components and mass percentages of the aluminum alloy are: Si: 0.9-1.3%, Fe: ≤0.2%, Cu: 0.4-0.8%, Mn: 0.4-0.8%, Mg: 0.8-1.2%, Cr: ≤0.3%, Zn: 0.2-0.5%, Ti: ≤0.1%, and the balance is Al and unavoidable impurity elements;

[0010] A2. The aluminum alloy ingot is subjected to homogenization annealing and turning, then preheated and hot continuous rolled to obtain hot continuous rolled wire rods.

[0011] A3. The hot continuous rolled wire rods are subjected to the first drawing to obtain first drawn wire rods, followed by annealing treatment. After the annealing is completed, the second drawing treatment is carried out to obtain cold heading drawn wire rods.

[0012] A4. The obtained cold heading drawn wire rods are subjected to T6 treatment to obtain T6 state wire rods.

[0013] In one or more embodiments of the present invention, the deformation amount of the first drawing in step A3 is 3-20%.

[0014] In one or more embodiments of the present invention, the deformation amount of the second drawing in step A3 is 20-40%.

[0015] In one or more embodiments of the present invention, the annealing in step A3 is as follows: the annealing temperature is 380-420 °C, the annealing time is 1-5 h, and the cooling rate ≤ 30 °C / h.

[0016] In one or more embodiments of the present invention, the preheating in step A2 is as follows: heat preservation is carried out at 470-530 °C for 1-3 h.

[0017] In one or more embodiments of the present invention, the hot continuous rolling in step A2 satisfies: the starting rolling temperature is 470-530 °C, and the final rolling temperature is 280-340 °C.

[0018] In one or more embodiments of the present invention, the T6 treatment in step A4 is as follows: heat preservation is carried out at 560 °C for 1-2 h, water-cooled to room temperature, then heat preservation is carried out at 180 °C for 4-8 h, and air-cooled to room temperature.

[0019] In one or more embodiments of the present invention, the wire rods are prepared by the manufacturing method of 6XXX aluminum alloy fastener wire rods.

[0020] In one or more embodiments of the present invention, the fasteners are prepared from the wire rods.

[0021] In one or more embodiments of the present invention, the fastening assembly includes fasteners.

[0022] Compared with the prior art, the manufacturing method, wire, fastener and assembly of the 6XXX aluminum alloy fastener wire of the present invention, by increasing the second cold drawing deformation, optimizes the manufacturing process of the fastener wire, effectively improves the mechanical properties of the wire after T6 heat treatment, especially the yield strength, helps to improve the subsequent fastener tightening torque and guaranteed load, and improves the service reliability of the bolt; and the cold heading wire exhibits good cold heading formability and good corrosion resistance. Compared with the H12 or H13 wire supply state, after the drawing deformation of the wire after annealing is increased to 20-40%, the mechanical properties of the wire in the T6 state are better, and it can ensure that the material does not crack when the cold heading reduction is 70%:

[0023] (1) The cold processing technology of the wire is optimized. Compared with the H12 or H13 supply state, the deformation amount of the cold drawing process after annealing is increased. The final cold heading drawn wire does not crack after 70% cold heading pressure, meeting the requirement of no cracking during cold heading of fasteners. After T6 treatment, the yield strength of the wire is 380-400MPa, the tensile strength is 420-430MPa, the elongation after fracture is 12-20%, the average grain size is refined to 50-60μm, and the maximum corrosion depth of intergranular corrosion is 120-180μm.

[0024] (2) By optimizing the ratio of alloy components, the yield strength of the alloy is increased to 390-400 MPa, which increases the tightening load and proof load used in fasteners and improves the service reliability of fasteners.

[0025] (3) The addition of Cr in the alloy inhibits the reduction of partial dislocation density during solution heat treatment of the wire and better controls the alloy structure; at the same time, the grain growth in the alloy is controlled to a certain extent, and the average grain size is reduced to 50-60 μm.

[0026] (4) The increase of Zn content in the alloy improves the corrosion resistance of the alloy, and the maximum corrosion depth of intergranular corrosion in the alloy is reduced to 120-150 μm. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 Flow chart of a method for manufacturing a wire material for 6XXX aluminum alloy fasteners in one embodiment of the present invention;

[0029] Figure 2The cold heading cracking conditions of Comparative Example 1, Example 1, Example 5 and Example 6 of the present invention are shown in the figure. The numbers in the figure are the deformation amounts of the second wire drawing.

[0030] Figure 3 The cold heading cracking conditions of Comparative Example 2, Example 2, Example 7 and Example 8 of the present invention are shown in the figure. The numbers in the figure indicate the deformation amount of the second wire drawing. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] The method for manufacturing high-strength 6XXX aluminum alloy wire for fasteners of the present invention, in one embodiment, specifically comprises the following steps:

[0033] S1. Semi-continuous casting: According to the 6XXX series aluminum alloy, pure metal or intermediate alloy is weighed as raw material according to the mass percentage, and the weighed raw material is added into the melting furnace for heating and melting. After stirring, slagging, degassing and refining at 720℃~750℃, semi-continuous casting is performed to obtain an aluminum alloy ingot, wherein the components and mass percentages of the aluminum alloy are: Si: 0.9~1.3%, Fe: ≤0.2%, Cu: 0.4~0.8%, Mn: 0.4~0.8%, Mg: 0.8~1.2%, Cr: ≤0.3%, Zn: 0.2~0.5%, Ti: ≤0.1%, and the balance is Al and unavoidable impurity elements.

[0034] S2. Homogenizing annealing treatment: The ingot obtained in step S1 is subjected to a double-stage homogenizing annealing treatment to obtain a homogenizing annealed ingot.

[0035] S3, turning: the homogenized annealed ingot obtained in step S2 is turned to remove the oxide scale, defects and stains on the surface to obtain an aluminum alloy ingot blank.

[0036] S4, preheating, hot rolling: the ingot obtained in step S3 is placed in a resistance heating furnace for preheating. Subsequently, the preheated ingot is passed through a hot rolling mill to obtain a hot rolled wire.

[0037] S5, drawing and annealing: the hot rolled wire obtained in step S4 is subjected to a first drawing to obtain a drawn wire, and then subjected to an annealing treatment. After the annealing is completed, a second drawing treatment is performed to obtain a final cold heading drawn wire.

[0038] S6, T6 treatment: the final cold-headed drawn wire obtained in step S5 is subjected to T6 treatment to obtain T6 state wire.

[0039] Preferably, in step S3, the turning thickness of the car skin process is 2 to 4 mm.

[0040] Preferably, in step S4, the cast rod is preheated at 470-530° C. for 2 h.

[0041] Preferably, in step S4, the starting rolling temperature of the hot rolling process is 470-530°C, and the final rolling temperature is 280-340°C.

[0042] Preferably, step S5 includes: the first drawing deformation amount is 3-20%, and the second drawing deformation amount is 20-40%.

[0043] Preferably, step S5 comprises: an annealing temperature of 380-420° C., an annealing time of 1-5 h, and a cooling rate of ≤30° C. / h.

[0044] Embodiment 1:

[0045] The manufacturing method of the high-strength 6XXX aluminum alloy wire for fasteners in this embodiment is, according to the mass percentage, wt%: Si: 1.12%, Fe: 0.12%, Cu: 0.55%, Mn: 0.60%, Mg: 0.95%, Cr: 0.19%, Zn: 0.30%, Ti: 0.03%, and the remainder is Al and unavoidable impurity elements, recorded as Alloy 1.

[0046] The manufacturing method of aluminum alloy wire is as follows:

[0047] S1. Semi-continuous casting: Pure metal or intermediate alloy is weighed as raw material according to the mass percentage of aluminum alloy elements, and the weighed raw materials are added into a melting furnace for heating and melting. After stirring, slagging, degassing and refining at 720°C, semi-continuous casting is performed to obtain aluminum alloy ingots.

[0048] S2. Homogenizing annealing treatment: The ingot obtained in step S1 is subjected to a double-stage homogenizing annealing treatment to obtain a homogenizing annealed ingot.

[0049] S3, turning: the homogenized annealed ingot obtained in step S2 is turned to remove the oxide scale, defects and stains on the surface, and the turning thickness is 3 mm to obtain an aluminum alloy ingot blank;

[0050] S4, preheating, hot rolling: the ingot obtained in step S3 is placed in a resistance heating furnace for preheating for 2 hours at a temperature of 500° C. Subsequently, the preheated ingot is rolled by a hot rolling mill with a final rolling temperature of 300° C., and then water quenched to obtain a φ8.6 mm hot rolled wire.

[0051] S5. Drawing and annealing: The hot-rolled wire rod obtained in step S4 is drawn for the first time to obtain a drawn wire rod with a diameter of φ8.0 mm, and the drawing deformation amount is 10%; then annealing treatment is carried out, the annealing temperature is 400 °C, the annealing time is 3 h, and the cooling rate is 30 °C / h. The annealed wire rod is obtained. The annealed wire rod is drawn for the second time, and the drawing deformation amount is 40% to obtain the final cold-heading drawn wire rod.

[0052] S6. T6 treatment: The final cold-heading drawn wire rod obtained in step S5 is subjected to T6 treatment, that is, it is held at 560 °C for 1 h, water-cooled, and then held at 180 °C for 6 h and air-cooled to obtain the T6-state wire rod.

[0053] Example 2:

[0054] The difference between this example and Example 1 is only that: the aluminum alloy is in mass percentage, wt%: Si: 1.10%, Fe: 0.19%, Cu: 0.69%, Mn: 0.59%, Mg: 1.0%, Zn: 0.40%, Ti: 0.02%, and the balance is Al and unavoidable impurity elements, denoted as alloy 2.

[0055] Example 3

[0056] The difference between this example and Example 1 is only that: the aluminum alloy is in mass percentage, wt%: Si: 0.9%, Fe: 0.2%, Cu: 0.4%, Mn: 0.4%, Mg: 0.8%, Cr: 0.3%, Zn: 0.5%, Ti: 0.1%, and the balance is Al and unavoidable impurity elements, denoted as alloy 3.

[0057] Example 4

[0058] The difference between this example and Example 1 is only that: the aluminum alloy is in mass percentage, wt%: Si: 1.3%, Fe: 0.1%, Cu: 0.8%, Mn: 0.8%, Mg: 1.2%, Cr: 0.1%, Zn: 0.2%, Ti: 0.05%, and the balance is Al and unavoidable impurity elements, denoted as alloy 4.

[0059] Example 5:

[0060] The difference between this example and Example 1 is only that: the drawing deformation amount of the second drawing is 30%.

[0061] Example 6:

[0062] The difference between this example and Example 1 is only that: the drawing deformation amount of the second drawing is 20%.

[0063] Example 7:

[0064] The only difference between this embodiment and embodiment 2 is that the drawing deformation amount of the second drawing is 30%.

[0065] Embodiment 8:

[0066] The only difference between this embodiment and embodiment 2 is that the drawing deformation amount of the second drawing is 20%.

[0067] Example 9

[0068] The only difference between this embodiment and embodiment 1 is that the deformation amount of the first drawing is 3%.

[0069] Example 10

[0070] The only difference between this embodiment and embodiment 2 is that the deformation amount of the first drawing is 3%.

[0071] Embodiment 11

[0072] The only difference between this embodiment and embodiment 1 is that the deformation amount of the first drawing is 20%.

[0073] Example 12

[0074] The only difference between this embodiment and embodiment 2 is that the deformation amount of the first drawing is 20%.

[0075] Embodiment 13

[0076] The only difference between this embodiment and embodiment 1 is that the annealing temperature during drawing and annealing is 380° C., the annealing time is 1 h, and the cooling rate is 25° C. / h.

[0077] Embodiment 14

[0078] The only difference between this embodiment and embodiment 2 is that the annealing temperature during drawing and annealing is 380° C., the annealing time is 1 h, and the cooling rate is 25° C. / h.

[0079] Embodiment 15

[0080] The only difference between this embodiment and embodiment 1 is that the annealing temperature during drawing and annealing is 420° C., the annealing time is 5 h, and the cooling rate is 15° C. / h.

[0081] Example 16

[0082] The only difference between this embodiment and embodiment 2 is that the annealing temperature during drawing and annealing is 420° C., the annealing time is 5 h, and the cooling rate is 15° C. / h.

[0083] Embodiment 17

[0084] The difference between this embodiment and embodiment 1 is that the hot rolling meets the following requirements: the starting rolling temperature is 470°C and the final rolling temperature is 280°C.

[0085] Embodiment 18

[0086] The only difference between this embodiment and embodiment 2 is that the hot rolling meets the following requirements: the starting rolling temperature is 530°C and the final rolling temperature is 340°C.

[0087] Embodiment 19

[0088] The difference between this embodiment and embodiment 1 is that the T6 treatment is: keeping at 560° C. for 1 hour, water cooling to room temperature, then keeping at 180° C. for 4 hours, and air cooling to room temperature.

[0089] Embodiment 20

[0090] The difference between this embodiment and embodiment 2 is that the T6 treatment is: keeping at 560° C. for 2 hours, water cooling to room temperature, then keeping at 180° C. for 4 hours, and air cooling to room temperature.

[0091] Embodiment 21

[0092] The difference between this embodiment and embodiment 1 is that the T6 treatment is: keeping at 560° C. for 1 hour, water cooling to room temperature, then keeping at 180° C. for 8 hours, and air cooling to room temperature.

[0093] Embodiment 22

[0094] The difference between this embodiment and embodiment 2 is that the T6 treatment is: keeping at 560° C. for 2 hours, water cooling to room temperature, then keeping at 180° C. for 8 hours, and air cooling to room temperature.

[0095] Comparative Example 1:

[0096] The difference between this comparative example and Example 1 is that the drawing deformation amount of the second drawing is 10%, and the final cold-headed drawn wire is obtained, that is, the wire with a delivery state of H13.

[0097] Comparative Example 2:

[0098] The only difference between this comparative example and Example 2 is that the drawing deformation amount of the second drawing is 10%, and the final cold heading drawn wire rod is obtained, that is, the wire rod with a delivery state of H13.

[0099] Performance Test Results

[0100] (1) Table 1 shows the tensile properties, grain size and intergranular corrosion resistance of Examples 1 to 4. For the alloy components within the range, after the same processing technology, the yield strength of the alloy is 380 to 400 MPa, the tensile strength is 420 to 430 MPa, the elongation is 14 to 18%, the average grain size is 50 to 70 μm, and the maximum depth of intergranular corrosion is 120 to 180 μm.

[0101] Table 1 Tensile properties, grain size and intergranular corrosion resistance of Examples 1 to 4

[0102]

[0103] (2) Table 2 shows the tensile properties, grain size and intergranular corrosion resistance of Examples 5 to 12. Compared with Comparative Example 1, Examples 1, 5 and 6 increase the second drawing deformation from 10% to 40%, the yield strength of the alloy increases from 367 MPa to 390, 394 and 398 MPa, respectively, the tensile strength increases from 398 MPa to 423, 424 and 428 MPa, respectively, the average grain size decreases from 410 μm to 315, 81 and 57 μm, respectively, the grain structure refinement is abnormally significant, and the corrosion resistance of the alloy is also reduced.

[0104] Compared with Comparative Example 2, Examples 2, 7 and 8 increase the amount of the second drawing deformation, gradually increasing from 10% to 40%. The yield strength of the alloy is increased from 358 MPa to 380, 385 and 3856 MPa, respectively, and the tensile strength is increased from 407 MPa to 425, 432 and 431 MPa, respectively. The average grain size is reduced from 452 μm to 355, 89 and 58 μm, respectively. The grain structure is refined abnormally and significantly, and the corrosion resistance of the alloy is also reduced.

[0105] For the first drawing deformation, compared with Examples 6, 8, 9 to 12, the first drawing deformation is 3 to 20%, the yield strength of the alloy is 380 to 400 MPa, the tensile strength is 410 to 430 MPa, the average grain size is 40 to 90 μm, and the maximum intergranular corrosion depth is 120 to 160 μm, and its performance is better than that of Comparative Examples 1 and 2.

[0106] Table 2 Tensile properties, grain size and intergranular corrosion resistance of Examples 5 to 12

[0107]

[0108] (3) Table 3 shows the tensile properties, grain size and intergranular corrosion resistance of Examples 13 to 18. When the annealing temperature is 380 to 420°C, the annealing time is 1 to 5 h, and the cooling rate is ≤30°C / h, the yield strength of the alloy is 370 to 400 MPa, the tensile strength is 400 to 430 MPa, the average grain size is 50 to 100 μm, and the maximum intergranular corrosion depth is 130 to 170 μm. The performance is better than that of Comparative Examples 1 and 2.

[0109] Table 3 Tensile properties, grain size and intergranular corrosion resistance of Examples 13 to 18

[0110]

[0111] (4) Table 4 shows the tensile properties, grain size and intergranular corrosion resistance of Examples 18 to 22. Under different solution and aging process times, the yield strength of the alloy is 380 to 400 MPa, the tensile strength is 420 to 430 MPa, the average grain size is 60 to 70 μm, and the maximum intergranular corrosion depth is 120 to 170 μm. The performance is better than that of Comparative Examples 1 and 2.

[0112] Table 4 Tensile properties, grain size and intergranular corrosion resistance of Examples 19 to 22

[0113]

[0114] (5) The final cold-forged drawn wire obtained in Comparative Example 1 and Examples 1, 5, and 6 was subjected to a fastener head cold-forging cracking test. The cold-forging reduction of the wire was 70%, and all the materials did not crack. Figure 2 As shown, the wire will not crack during the cold heading process of the fastener and has good cold heading processing performance.

[0115] The final cold-forged drawn wires obtained in Comparative Example 2 and Examples 2, 7, and 8 were subjected to a cold-forging cracking test on the head of the fastener. The cold-forging reduction of the wires was 70%, and all the materials did not crack. Figure 3 As shown, the wire will not crack during the cold heading process of the fastener and has good cold heading processing performance.

[0116] (6) By optimizing the ratio of alloy components, compared with alloy 2, at the same second drawing deformation, the yield strength of alloy 1 is increased to 390-400 MPa, which increases the tightening load and guarantee load used by fasteners and improves the service reliability of fasteners. In addition, the addition of Cr in alloy 1 inhibits the reduction of partial dislocation density, better controls the alloy structure, and controls the growth of alloy grains to a certain extent, and the average grain size is reduced to 50-60 μm, so that the yield strength of Examples 1, 5, and 6 is significantly improved compared with Examples 2, 7, and 8. The Zn content in alloy 2 improves the corrosion resistance of the alloy, and the maximum corrosion depth of intergranular corrosion in the alloy is reduced to 120-150 μm.

[0117] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0118] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for manufacturing a 6XXX aluminum alloy fastener wire, comprising the following steps: A1. Pure metal or intermediate alloy is weighed as raw material according to the composition content of aluminum alloy, the weighed raw material is added into a smelting furnace for heating and melting, stirred, slag-scraped, degassed and refined at 720°C to 750°C, and then semi-continuously cast to obtain an aluminum alloy ingot, wherein the components and mass percentages of the aluminum alloy are: Si: 0.9-1.3%, Fe: ≤0.2%, Cu: 0.4-0.8%, Mn: 0.4-0.8%, Mg: 0.8-1.2%, Cr: ≤0.3%, Zn: 0.2-0.5%, Ti: ≤0.1%, and the balance is Al and unavoidable impurity elements; A2, homogenizing and annealing the aluminum alloy ingot, preheating the lathe, and hot rolling to obtain hot rolled wire; A3, drawing the hot rolled wire rod for the first time to obtain a primary drawn wire rod, and then performing annealing treatment, and after the annealing is completed, performing a second drawing treatment to obtain a cold heading drawn wire rod; A4. The obtained cold-headed drawn wire is subjected to T6 treatment to obtain T6 state wire.

2. The method for manufacturing a 6XXX aluminum alloy fastener wire according to claim 1, characterized in that: The deformation amount of the first drawing in step A3 is 3-20%.

3. The method for manufacturing a 6xxx aluminum alloy fastener wire according to claim 1, characterized in that: The deformation amount of the second drawing in step A3 is 20-40%.

4. The method for manufacturing a 6XXX aluminum alloy fastener wire according to claim 1, characterized in that: The annealing in step A3 is as follows: the annealing temperature is 380-420° C., the annealing time is 1-5 h, and the cooling rate is ≤30° C. / h.

5. The method for manufacturing a 6xxx aluminum alloy fastener wire according to claim 1, characterized in that: The preheating in step A2 is: keeping warm at 470-530° C. for 1-3 hours.

6. The method for manufacturing a 6xxx aluminum alloy fastener wire according to claim 1, characterized in that: The hot rolling in step A2 satisfies: the starting rolling temperature is 470-530°C, and the final rolling temperature is 280-340°C.

7. The method for manufacturing a 6xxx aluminum alloy fastener wire according to claim 1, characterized in that: The T6 treatment in step A4 is: keeping at 560° C. for 1 to 2 hours, cooling to room temperature with water, then keeping at 180° C. for 4 to 8 hours, and cooling to room temperature with air.

8. A wire material prepared by the method for manufacturing a 6xxx aluminum alloy fastener wire material according to any one of claims 1 to 7.

9. A fastener prepared from the wire material according to claim 8.

10. Fastening assembly comprising the fastener according to claim 9.

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