CN119411038B - A production process for 7xxx aluminum alloy coils with high cold upsetting formability - Google Patents

Abstract

The invention relates to a production process of a high cold heading forming 7xxx aluminum alloy rolled bar, which comprises the steps of casting an aluminum alloy melt into an aluminum alloy bar through quick cooling, peeling the aluminum alloy bar after homogenization treatment to remove an oxide layer, continuously extruding the aluminum alloy bar into an aluminum alloy rolled bar, drawing the aluminum alloy rolled bar, adopting double-stage low-temperature annealing treatment after the drawing is finished, thus obtaining the high cold heading forming 7xxx aluminum alloy rolled bar, wherein the drawing deformation is more than or equal to 20%, the double-stage low-temperature annealing treatment is carried out under the conditions that the temperature is firstly kept at 200-260 ℃ for 2-4h, then is kept at 320-360 ℃ for 2-6h, after the heat preservation is finished, the aluminum alloy rolled bar is cooled to 240-280 ℃ by a cooling rate furnace of less than or equal to 30 ℃ and is discharged for air cooling. The invention can produce 7xxx aluminum alloy rolled bars with uniform and consistent performance and excellent cold heading forming performance, and is especially suitable for producing large-coil-weight (> 200 Kg) aluminum alloy rolled bars.

Description

Production process of high cold heading formability 7xxx aluminum alloy rolled bar

Technical Field

The invention belongs to the technical field of metal plastic processing, and relates to a production process of a high cold heading formability 7xxx aluminum alloy rolled bar.

Background

Along with the rapid development of light weight and connection technologies of automobiles, particularly new energy automobiles, aerospace, high-speed rail and the like, the 7xxx Al-Zn-Mg-Cu alloy is a heat-treatable reinforced aluminum alloy, has excellent properties of high specific strength, high specific rigidity, good processability, high fracture toughness, riveting property and the like, and is widely applied to manufacturing cold heading parts and fasteners in advanced equipment fields of aerospace, automobiles, rail transit and the like. Meanwhile, the cold heading industry is developing towards high speed, intelligent and automatic, and aluminum alloy rolled bars with great rolling weight, uniform and consistent performance and excellent forming performance are urgently needed. The 7xxx aluminum alloy has a high strength and good mechanical properties, but has a low cold forming property, and in particular, has a problem that it has a relatively low plasticity and a strong tendency to work hardening when used in a cold heading process, so that it is not easy to form by cold working deformation at normal temperature without generating cracks or other defects, and the hardness of the material is easily increased rapidly with the increase of the cold deformation amount, so that the cold deformation becomes difficult, and the dimensional accuracy and the surface quality of the final product may be affected.

At present, the production methods of aluminum alloy bars mainly comprise a semicontinuous ingot casting-extrusion method and a semicontinuous ingot casting-hot continuous rolling method. The production process of the semicontinuous ingot casting-extrusion method mainly comprises semicontinuous casting, ingot casting homogenization, ingot casting heating, hot extrusion and aluminum alloy bar. Because the length of the extruded ingot blank is limited, the extruded bar is usually of a fixed length, and the machine has to be stopped and reloaded frequently in the downstream application process, the high-speed, intelligent and automatic development requirements of the modern cold heading industry cannot be met.

In order to increase the length of the aluminum alloy bar to improve the production efficiency, a semi-continuous casting bar-hot continuous rolling method is developed in China in recent years, and the production procedures mainly comprise semi-continuous casting, long casting bar homogenization, long casting bar heating, long casting bar hot continuous rolling, coiling, hot continuous finish rolling and aluminum alloy coiled bar. The semi-continuous cast rod-hot tandem rolling process produces bars of greater coil weight (about 250 Kg) than the gauge length of the semi-continuous cast ingot-extrusion process. However, for a bar with a larger diameter, besides solving the length problem of the bar, more importantly, when the bar with a larger diameter is produced by the current production process, coarse crystals and microcracks are easily generated due to the small deformation of the center of the bar, which directly affects the cold heading formability of the bar.

In view of the above-described shortcomings of the high-coil-weight, high-performance aluminum alloy coil bar manufacturing process, and the low cold formability of 7xxx aluminum alloys, there is a need in the cold heading industry to develop a producible product

A production process of 7xxx aluminum alloy bars with large coil weight (single coil is more than 200 Kg) and excellent cold heading formability.

Disclosure of Invention

First, the technical problem to be solved

In view of the above-mentioned shortcomings and disadvantages of the prior art, the invention provides a production process of a 7xxx aluminum alloy rolled bar with high cold heading formability, which can produce the 7xxx aluminum alloy rolled bar with uniform and consistent performance and excellent cold heading formability, is especially suitable for producing large-coil-weight (> 200 Kg) aluminum alloy rolled bars, and solves the technical problems that the 7xxx aluminum alloy rolled bar with high cold heading formability is difficult to produce in the prior art, and cannot meet the high-speed, intelligent and automatic processing requirements of the cold heading industry.

(II) technical scheme

The invention provides a production process of a high cold heading forming 7xxx aluminum alloy rolled bar, which comprises the steps of casting an aluminum alloy melt into an aluminum alloy bar through quick cooling and continuous casting, peeling the aluminum alloy bar after homogenization treatment to remove an oxide layer, continuously extruding the aluminum alloy bar into an aluminum alloy rolled bar, drawing the aluminum alloy rolled bar, and adopting double-stage low-temperature annealing treatment after the drawing is finished to obtain the high cold heading forming 7xxx aluminum alloy rolled bar;

wherein the drawing deformation is more than or equal to 20%;

The two-stage low-temperature annealing treatment condition is that heat is preserved for 2-4 hours at 200-260 ℃, then the temperature is raised to 320-360 ℃ for heat preservation for 2-6 hours, after the heat preservation is finished, the two-stage low-temperature annealing treatment is cooled to 240-280 ℃ at the cooling rate of less than or equal to 30 ℃ per hour (preferably 260 ℃) and is discharged for air cooling.

According to a preferred embodiment of the invention, the aluminium alloy melt is continuously cast into billets of 22-25mm diameter by rapid cooling at a casting speed of 500-700mm/min, preferably 550-600mm/min.

According to the preferred embodiment of the invention, the rapid cooling continuous casting is horizontal continuous casting or upward continuous casting, the cooling speed of the rapid cooling continuous casting is more than 200 ℃ per second, and the continuous casting temperature is controlled to 680-690 ℃.

According to the preferred embodiment of the invention, the homogenization treatment conditions are that the temperature is kept between 460 and 480 ℃ for 8 to 16 hours, the temperature is cooled to 240 to 280 ℃ with the cooling rate of less than or equal to 30 ℃ per hour (preferably 260 ℃), and the furnace is taken out for air cooling.

According to a preferred embodiment of the invention, the peeling amount is 2-5mm during the peeling treatment.

According to a preferred embodiment of the invention, the extrusion die cavity outlet temperature is 420-460 ℃ and the extrusion wheel speed is 2-6rpm during continuous extrusion. In particular, when forming an aluminum alloy bar with a diameter of 16mm or more, an expanding continuous extrusion method is used, and when forming an aluminum alloy bar with a diameter of less than 16mm, a conventional continuous extrusion method is used.

According to the preferred embodiment of the invention, the drawing is performed by using a disc drawing machine, for example, the disc drawing machine is an 1800 disc drawing machine or a 1200 disc drawing machine.

In a second aspect, the invention provides a high cold heading forming 7xxx aluminum alloy coil rod prepared by the production process of any of the above embodiments.

Preferably, the Gao Lengdui-formability 7xxx aluminum alloy coiled bar is characterized in that the transverse section is free of coarse crystals, longitudinal grains are fibrous, the forging ratio of the cold upsetting test is less than 1/3, and the cold upsetting formability is very good.

Preferably, the Gao Lengdui formable 7xxx aluminum alloy coil bar single coil weight is greater than 200Kg, more preferably greater than 500Kg. The 7 xxx-series high strength aluminum alloys include, but are not limited to, aluminum alloys such as 7a03, 7075, 7475, 7050, 7a04, 7a31, and the like.

In the application, the forging ratio refers to the ratio of the height of a sample after cold forging to the height of the sample before cold forging, and the smaller the ratio is, the better the cold workability of the aluminum alloy material is.

(III) beneficial effects

Aiming at the technical problem that the 7xxx aluminum alloy rolled bar with large rolling weight and high cold heading forming performance is difficult to produce in the prior art, the invention provides a production process of the 7xxx aluminum alloy rolled bar with high cold heading forming performance, which mainly comprises the working procedures of quick cooling continuous casting, homogenization treatment, peeling, continuous extrusion, drawing, double-stage low-temperature annealing and the like of an aluminum alloy bar. The invention mainly controls the drawing deformation amount to be not less than 20% in the drawing process, adopts double-stage low-temperature annealing treatment to ensure that the structure is characterized in that the transverse section is free from coarse crystals and the longitudinal crystal grains are fibrous, the forging ratio of the aluminum alloy rolled bar material in a cold upsetting test is less than 1/3, the cold upsetting formability is higher than the standard of 1/2 specified in the national standard GBT233-2000 metal material upsetting test method, and the high cold upsetting formability can meet the performance requirements of cold upsetting forming of 7xxx series high-strength aluminum alloy complex cold upsetting pieces and fastening pieces.

On one hand, the invention solves the problem that the prior art is difficult to produce large-volume heavy aluminum alloy rolled bars, the single-volume weight has no upper limit and can reach hundreds or even thousands Kg, and on the other hand, the 7xxx series high-strength aluminum alloy prepared by the invention has very high cold processing performance, uniform and consistent product performance, the forging ratio of a cold upsetting test is less than 1/3, and very good cold upsetting formability.

Drawings

Fig. 1 shows a cold upsetting test sample of 7075 and 7a03 aluminum alloy rolled bars, wherein the left side is 7075 aluminum alloy, and the right side is 7a03 aluminum alloy.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments for better explaining the present invention.

Aiming at the technical problems that the prior art is difficult to produce the 7xxx aluminum alloy rolled bar with large rolling weight and high cold heading forming performance, the invention provides a production process of the 7xxx aluminum alloy rolled bar with high cold heading forming performance, which mainly comprises the steps of continuously casting an aluminum alloy melt into an aluminum alloy bar through quick cooling, peeling the aluminum alloy bar after homogenization treatment to remove an oxide layer, continuously extruding the aluminum alloy bar into an aluminum alloy rolled bar, drawing the aluminum alloy rolled bar, and adopting two-stage low-temperature annealing treatment after the drawing is finished to obtain the 7xxx aluminum alloy rolled bar with high cold heading forming performance;

Wherein, the drawing deformation is more than or equal to 20 percent, and the maximum drawing deformation is ensured that the aluminum alloy bar cannot be broken. Experiments prove that if the drawing deformation is smaller than 20%, uneven deformation can be generated, and finally the uniformity and consistency of the product performance are affected.

The two-stage low-temperature annealing treatment condition is that the temperature is firstly kept for 2-4 hours at 200-260 ℃, then is raised to 320-360 ℃ for 2-6 hours, and after the heat preservation is finished, the two-stage low-temperature annealing treatment is cooled to 240-280 ℃ at the cooling rate of less than or equal to 30 ℃ per hour (preferably 260 ℃) and is discharged for air cooling. The quenching effect can reduce the extrusion processing performance of the aluminum alloy by utilizing the heat preservation effect of the furnace body to prevent the quenching effect caused by the excessively high cooling speed during the period from the end of heat preservation to 240-280 ℃, if the tapping temperature is higher than 280 ℃, the quenching effect still exists to reduce the extrusion processing performance of the aluminum alloy, and if the tapping temperature is lower than 240 ℃, the energy consumption is not favorably saved and the heat preservation requirement on the furnace body is excessively high, the cost is increased.

The first stage of the two-stage low-temperature annealing is pre-annealing at 200-260 ℃ and lower in pre-annealing temperature, the second stage is main annealing at 320-360 ℃ and higher in temperature than the first stage. By the treatment of two different temperature stages, the mechanical property, ductility and processability are improved, stress is released, stress corrosion cracking tendency during subsequent processing is prevented, grain structure refinement is promoted, and cold heading forming performance of the 7xxx aluminum alloy rolled bar is improved. Under the conditions of the two-stage low-temperature annealing and the temperature setting thereof, the work hardening generated by cold drawing can be eliminated, and the conditions of recrystallization and precipitation strengthening phase coarsening can be avoided.

Preferably, the aluminum alloy melt is continuously cast into bars with the diameter of 22-25mm by quick cooling, the casting speed is 500-700mm/min, preferably 550-600mm/min, and the continuous casting temperature is controlled to 680-690 ℃. If the casting temperature is higher than this range, the 7xxx aluminum alloy is cast at a too low cooling rate and is not formed, and if the casting temperature is lower than this range, breakage is likely to occur.

Preferably, the rapid-cooling continuous casting is horizontal continuous casting or upward continuous casting, and the cooling rate of the rapid-cooling continuous casting is >200 ℃ per S.

Preferably, the homogenization treatment is carried out under the conditions of 460-480 ℃ heat preservation for 8-16h, furnace cooling to 240-280 ℃ at the cooling rate of less than or equal to 30 ℃ per hour (preferably 260 ℃), and furnace discharging and air cooling.

Generally, the homogenization time of a large slab ingot needs more than 24 hours, but for the bar stock which is cast by rapid cooling and continuous casting, the diameter is smaller, the cooling speed is high, and the structure uniformity is better, so that the homogenization time is controlled to be 8-16 hours, good homogenization effect can be realized, and the energy consumption is further saved. The quenching effect can be prevented from generating quenching effect due to the fact that the cooling speed is too high by utilizing the heat preservation effect of the furnace body after heat preservation is finished until the furnace is cooled to 240-280 ℃, if the tapping temperature is higher than 280 ℃, the quenching effect still exists, so that the extrusion processing performance of the aluminum alloy is reduced, and if the tapping temperature is lower than 240 ℃, the energy consumption is not favorably saved, and the heat preservation requirement on the furnace body is too high, and the cost is increased.

Preferably, the peeling amount is 2-5mm in the peeling treatment.

Preferably, in a continuous extrusion process, the extrusion die cavity exit temperature is 420-460 ℃ and the extrusion wheel speed is 2-6rpm. The continuous extrusion rotating speed is too low, so that the continuous extrusion machine is easy to stop when the load of the continuous extrusion machine is too high, and the product is easy to crack when the continuous extrusion rotating speed is too high.

In particular, when forming an aluminum alloy bar with a diameter of 16mm or more, an expanding continuous extrusion method is used, and when forming an aluminum alloy bar with a diameter of less than 16mm, a conventional continuous extrusion method is used.

Preferably, the drawing is performed using a disc puller, for example, 1800 disc puller or 1200 disc puller. The maximum diameter of the wire drawing disc of the 1800 disc drawing machine is 1800 mm (or more), thicker wires can be handled, and a larger amount of tensile deformation can be achieved. The maximum diameter of the wire drawing disc of the 1200 disc drawing machine is 1200 mm, and the wire drawing machine is suitable for machining wires with medium diameters.

The 7xxx aluminum alloy rolled bar produced by the process has high cold heading formability, is structurally characterized in that transverse sections are free of coarse crystals, longitudinal grains are fibrous, the forging ratio of a cold upsetting test is less than 1/3, and the process is particularly suitable for producing large-roll aluminum alloy rolled bars. Preferably, the single roll weight of the aluminum alloy rolled bar that can be produced by the present invention is several hundred to several thousand, and is not limited to an upper limit in theory, and is suitable for producing 7xxx aluminum alloy rolled bars for cold heading of aluminum alloys including, but not limited to, 7a03, 7075, 7475, 7050, 7a04, 7a31, and the like.

The following describes the aspects and technical effects of the present invention with reference to specific examples.

Example 1

The embodiment provides a production process of a 7A03 aluminum alloy rolled bar for manufacturing cold heading automobile parts, wherein the target diameter is 26mm, and the single roll weight is more than 1000 Kg.

The production process of the aluminum alloy rolled bar comprises the following steps:

(1) And (3) quick cooling continuous casting, namely, adopting 99.7% of aluminum ingot, zinc ingot and magnesium ingot and Al-10Cu, al-5Mn, al-5Ti and Al-5Cr intermediate alloy, calculating the weight proportion of each alloy according to the chemical composition range of the 7A03 aluminum alloy, proportioning according to the proportion, melting, refining, preserving heat and sampling after online filtering in a double 1000Kg capacity gas smelting furnace, and carrying out alloy chemical composition detection, wherein the table 1 is shown. Continuously casting into bars with the diameter of 25mm by adopting a horizontal continuous casting mode, controlling the continuous casting temperature to 680-690 ℃, controlling the cooling speed to be more than 200 ℃ per second, and setting the casting speed to be 550mm/min.

(2) Homogenizing treatment, namely placing a single roll of 1462Kg bar stock into a homogenizing furnace, heating to 465 ℃ and preserving heat for 12 hours, cooling to 260 ℃ and discharging and air cooling.

(3) Peeling the homogenized bar with peeling amount of 5mm.

(4) And extruding the barked bar on a 400-type aluminum continuous extruder in an expanding continuous extrusion mode to form a coiled bar with the diameter of 30 mm. The extrusion outlet temperature was set at 430℃and the extrusion wheel speed was 5.5rpm.

(5) The rolled bar with the diameter of 30mm is drawn on a 1800 disc drawing machine to form a finished rolled bar with the diameter of 26mm, and the drawing deformation is 24.89%.

(6) And (3) carrying out two-stage low-temperature annealing treatment on the drawn rolled bar with the diameter of 26mm, wherein the two-stage low-temperature annealing treatment condition is 230 ℃ heat preservation for 2h, 340 ℃ heat preservation for 4h, and discharging and air cooling after furnace cooling to 260 ℃.

Example 2

This example provides a process for manufacturing 7075 aluminum alloy rolled bar for manufacturing cold heading fasteners, which requires a diameter of 13.5mm and a single roll weight of 500Kg or more.

The production process of the aluminum alloy rolled bar comprises the following steps:

(1) And (3) quick cooling continuous casting, namely, adopting 99.7% of aluminum ingot, zinc ingot and magnesium ingot and Al-10Cu, al-5Mn, al-5Ti and Al-5Cr intermediate alloy, calculating the weight proportion of each alloy according to the chemical composition range of the 7075 aluminum alloy, proportioning according to the proportion, melting, refining, preserving heat and sampling after online filtering in a double 1000Kg capacity gas smelting furnace, and carrying out alloy chemical composition detection, wherein the table 1 is shown. Continuously casting into bars with the diameter of 25mm by adopting a horizontal continuous casting mode, controlling the continuous casting temperature to 680-690 ℃, controlling the cooling speed to be more than 200 ℃ per second, and setting the casting speed to be 600mm/min.

(2) Homogenizing treatment, namely placing a single coil of bar stock with the weight of 1522Kg into a homogenizing furnace, heating to 465 ℃ and preserving heat for 12 hours, cooling to 260 ℃ in a furnace, and discharging and air cooling.

(3) Peeling the homogenized bar with peeling amount of 5mm.

(4) The barked bar is extruded into a coiled bar with the diameter of 15.5mm by adopting a conventional continuous extrusion mode, the extrusion outlet temperature is set to be 450 ℃, and the rotation speed of an extrusion wheel is 3.2rpm.

(5) The rolled bar with the diameter of 15.5mm is drawn on a 1200 disc drawing machine to a finished rolled bar with the diameter of 13.5mm, and the drawing deformation is 24.14%.

(6) And (3) carrying out two-stage low-temperature annealing treatment on the drawn rolled bar with the diameter of 13.5mm, wherein the two-stage low-temperature annealing treatment conditions are that heat preservation is carried out for 2 hours at 230 ℃ and then heat preservation is carried out for 4 hours at 320 ℃, and the rolled bar is discharged from the furnace for air cooling after being cooled to 260 ℃.

Finally, samples were taken from the head and tail of 7075, 7a03 aluminum alloy coil bar, respectively, and mechanical property tests (as in table 1) were performed using a universal material tester (CMT-5105 GL) and cold upsetting tests using a four column hydraulic press (YW 32-100T), the results of which are shown in table 2 and fig. 1.

TABLE 17A 03 (6.0-6.7) and 7075 aluminum alloys main chemical compositions (weight percent,%)

TABLE 2 mechanical properties and cold upsetting test results of 7A03 and 7075 aluminum alloy rolled bars

From the mechanical properties and cold upsetting test results of Table 2 and FIG. 1, it is known that the rolled bars of the aluminum alloy 7A03 and 7075 prepared by the production process of the invention have excellent mechanical properties, the forging ratio of the cold upsetting test reaches 32.6% and 29.1% respectively, the forging ratio is less than 1/3, and the cold upsetting formability is higher than the standard of the national standard GBT233-2000 metal material upsetting test method.

The aluminum alloy rolled bar product prepared by the production process disclosed by the invention is further processed into an automobile part and a fastener through cold heading, and the part and the fastener are crack-free and have good dimensional accuracy and surface quality. Therefore, the production process of the invention ensures that the forging ratio of the cold upsetting test of the produced aluminum alloy rolled bar product is less than 1/3 by controlling the drawing deformation of the key process to be not less than 20 percent and adopting double-stage low-temperature annealing treatment, which shows that the 7xxx aluminum alloy bar prepared by the invention has good cold upsetting processing deformation performance and can completely meet the requirements of cold upsetting forming of 7xxx high-strength aluminum alloy complex cold upsetting pieces and fastening pieces. In addition, the mechanical properties of the head part and the tail part of the bar product prepared by the invention are consistent.

In summary, the production process provided by the invention solves the problem that the prior art is difficult to produce large-volume heavy aluminum alloy rolled bars, the single-volume weight has no upper limit and can reach hundreds or even thousands Kg, meanwhile, the 7xxx series high-strength aluminum alloy prepared by the invention has very high cold processing performance, uniform and consistent product performance and excellent cold heading forming performance, and solves the technical problem that the current cold heading industry is in urgent need of producing high-strength aluminum alloy rolled bars with great volume and excellent forming performance for adapting to high-speed, intelligent and automatic development.

It should be noted that the above embodiments are merely for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all of the technical features may be replaced, and these modifications or substitutions may be combined according to the manner described in the embodiments without making the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present invention.

Claims (9)

1. A production process for a 7xxx aluminum alloy coil with high cold upsetting formability, characterized in that it comprises: rapidly cooling and continuously casting an aluminum alloy melt into an aluminum alloy rod, peeling the aluminum alloy rod to remove an oxide layer after homogenization, continuously extruding the aluminum alloy coil to form an aluminum alloy rod, drawing the aluminum alloy coil, and after drawing, performing a two-stage low-temperature annealing treatment to obtain a 7xxx aluminum alloy coil with high cold upsetting formability; The homogenization treatment conditions are as follows: keep at 460-480℃ for 8-16h, cool to 240-280℃ at a cooling rate of ≤30℃/h, and air cool out of the furnace; Wherein, the drawing deformation is ≥20%; The double-stage low-temperature annealing treatment conditions are: first keep at 200-260°C for 2-4h, then heat to 320-360°C and keep for 2-6h, after the insulation is completed, cool to 240-280°C at a cooling rate of ≤30°C/h, and air cool out of the furnace. 2. The production process according to claim 1 is characterized in that the aluminum alloy melt is rapidly cooled and continuously cast into bars with a diameter of 22-25 mm at a casting speed of 500-700 mm/min. 3. The production process according to claim 1 is characterized in that the rapid cooling continuous casting is horizontal continuous casting or upward continuous casting, and the cooling rate of the rapid cooling continuous casting is >200°C/S. 4. The production process according to claim 1 is characterized in that during the peeling process, the peeling amount is 2-5 mm. 5. The production process according to claim 1 is characterized in that, during the continuous extrusion process, the outlet temperature of the extrusion die cavity is 420-460°C, and the extrusion wheel speed is 2-6rpm; wherein, when forming an aluminum alloy bar with a diameter of more than 16 mm, an extended continuous extrusion method is adopted; when forming an aluminum alloy bar with a diameter of less than 16 mm, a conventional continuous extrusion method is adopted. 6. The production process according to claim 1 is characterized in that a disc drawing machine is used for drawing. 7. A 7xxx aluminum alloy coil bar with high cold upsetting formability, characterized in that it is prepared by the production process described in any one of claims 1-6. 8. The high cold upsetting formability 7xxx aluminum alloy coil bar according to claim 7, wherein the microstructure of the high cold upsetting formability 7xxx aluminum alloy coil bar is characterized by having no coarse grains in the transverse section and fibrous grains in the longitudinal section. 9. The high cold upsetting formability 7xxx aluminum alloy coil and bar according to claim 7, wherein the weight of a single coil of the high cold upsetting formability 7xxx aluminum alloy coil and bar is greater than 200 kg.