Preparation method of high-beryllium-content beryllium-copper alloy material

Abstract

The application provides a preparation method of a high-beryllium-content beryllium copper alloy material, which comprises the following steps: melting metal raw materials containing pure copper and a beryllium copper master alloy to obtain an alloy liquid, casting the alloy liquid to obtain an ingot, uniformly treating the ingot to obtain a homogenized casting blank, hot-rolling the homogenized casting blank to obtain a hot-rolled blank, annealing the hot-rolled blank to obtain an annealed blank, performing a cyclic "cold rolling-intermediate annealing" process on the annealed blank, and finally performing finish rolling and product annealing on the alloy strip to prepare the high-beryllium-content beryllium copper alloy material. The method can solve the problems of the second phase component of the high-beryllium-content strip being inconsistent, the strip being cracked, side-bent and wrinkled, and a large number of processing passes in the prior art.

Description

Technical Field

[0001] This invention belongs to the field of copper alloy technology, specifically relating to a method for preparing a high beryllium content beryllium copper alloy material. Background Technology

[0002] Beryllium copper alloys possess excellent properties such as high strength, high elasticity, high conductivity, fatigue resistance, and non-sparking characteristics, making them key materials for high-end electronic components in industries such as aerospace, computers, and automobiles. Based on their beryllium content, beryllium copper alloys are generally divided into two main categories: high-beryllium copper alloys, also known as high-strength beryllium copper alloys, with a beryllium content of 1.6 wt% to 2.1 wt%; and low-beryllium copper alloys, also known as high-conductivity beryllium copper alloys, with a beryllium content typically <0.7 wt%. In actual production, the beryllium content in low-beryllium copper alloys is generally controlled at around 0.4 wt%. Currently, the beryllium content of high-beryllium copper alloys has been increased to over 2.5 wt% to achieve even better secondary electron emission performance. However, when the Be content exceeds 2.3 wt.%, a hard and brittle β / γ phase will form in the alloy, causing stress concentration and cracking during material deformation. This is detrimental to the forming and processing of beryllium copper alloy strips, limiting the application of beryllium copper alloys in various electronic components. With increasing Be content, the number of β / γ phases also increases significantly, making the alloy more prone to processing cracks. Heat treatment is an important means of controlling the size, morphology, and distribution of the second phase. Among these, the heat treatment termination temperature and cooling rate are key parameters for phase transformation and precipitation in high-beryllium beryllium copper alloys. Furthermore, due to the presence of the second phase, beryllium copper alloys have a high work hardening rate, and the pass rate and total number of processing passes significantly affect production efficiency and yield.

[0003] Chinese patent CN202110121201.7 uses a two-stage heat treatment method to obtain α+β phase beryllium copper alloys. However, the first-stage heat treatment temperature is higher than the peritectic reaction temperature of beryllium copper (863℃), which easily leads to overheating and reduces alloy performance. Furthermore, the cooling method from the second-stage heat treatment temperature to room temperature is not strictly controlled; if the cooling rate is too slow, phase transformation and precipitation of the second phase can occur in the alloy, resulting in reduced workpiece machinability. Chinese patent CN202311557142.3 uses semi-continuous casting to obtain beryllium copper alloy ingots, and then produces beryllium copper alloy strips with beryllium content as high as 2.5 wt%~5.0 wt% through multiple rolling passes and intermediate annealing. However, the cooling method after heat treatment in this method is entirely water cooling, which increases the quenching stress of the workpiece, is detrimental to subsequent forming and processing, and the presence of blocky β phases in the alloy easily leads to stress concentration in the second phase during processing, causing workpiece cracking and resulting in a low yield. Meanwhile, this method does not strictly control the amount of rolling deformation, making the strip prone to side bending and wrinkling, requiring more finishing passes, increasing manufacturing costs, and resulting in low production efficiency. Therefore, developing a low-cost, high-efficiency, high-yield method for preparing high-beryllium-content beryllium copper alloy strip with a stable second-phase composition is of great significance for the engineering application of this material. Summary of the Invention

[0004] To address the problems in existing methods where the second phase composition of beryllium copper strip is uneven and inconsistent, leading to cracking, bending, wrinkling, and numerous processing passes due to imperfect heat treatment processes and rolling pass design, the present invention aims to provide a method for preparing high beryllium content beryllium copper alloy strip.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention discloses a method for preparing a high beryllium content beryllium copper alloy material. The method involves smelting a metal raw material containing pure copper and a beryllium copper master alloy to obtain an alloy liquid, casting the alloy liquid to obtain an ingot, homogenizing the ingot to obtain a homogenized billet, hot-rolling the homogenized billet to obtain a hot-rolled billet, annealing the hot-rolled billet to obtain an annealed billet, repeatedly cold-rolling and intermediate annealing the annealed billet to obtain an alloy strip, and finally performing precision rolling and final annealing on the alloy strip to prepare a high beryllium content beryllium copper alloy material.

[0007] The preparation method of this invention involves smelting and casting pure copper and beryllium copper master alloy to obtain an initial ingot. First, a homogenization treatment is performed to effectively solve the material segregation problem, and after cooling, a beryllium copper alloy with α+β phases is formed. Then, hot rolling is performed to further densify the billet and eliminate defects, while simultaneously breaking down the grains to improve the microstructure and processing performance, resulting in a beryllium copper hot-rolled billet. This billet is then annealed, and after cooling, an annealed billet of α+γ phase beryllium copper alloy is obtained. This annealed billet undergoes a cyclic "cold rolling-intermediate annealing" process, followed by finishing and final annealing to eliminate residual stress in the strip, promote recovery and recrystallization, and form a uniform microstructure, thus obtaining a high-beryllium-content beryllium copper alloy material.

[0008] In a preferred embodiment, the high beryllium content beryllium copper alloy material has the following composition by mass percentage: Be: 2.5 wt% to 4.0 wt%, Mg: 0.00 wt% to 2.00 wt%, Al: 0.00 wt% to 0.50 wt%, with the balance being copper.

[0009] In a further preferred embodiment, the high-beryllium-content beryllium copper alloy material has the following composition by mass percentage: Be: 2.8 wt%–3.8 wt%, Mg: 1.0 wt%–1.2 wt%, Al: 0.06 wt%–0.1 wt%, with the balance being copper. Using this preferred composition, the high-beryllium-content beryllium copper alloy, after sensitization and activation, forms a thicker BeO film on its surface. Since the BeO beryllium oxide film is the primary source of secondary electron emission, it exhibits better secondary electron emission performance. The added Mg element, after sensitization and activation of the finished strip, forms MgO on its surface, which is also a secondary electron emission source, synergistically emitting secondary electrons with BeO, thereby further improving performance. The added Al element, during sensitization and activation of the finished strip, forms an alumina film that encapsulates BeO and MgO, effectively preventing the secondary electron emission source from failing after exposure to air and extending the service life of the workpiece.

[0010] In a preferred embodiment, the metal raw material further comprises a copper-magnesium master alloy and pure aluminum.

[0011] Further preferably, the purity of the pure copper is ≥99.99%.

[0012] In a further preferred embodiment, the beryllium content in the beryllium copper master alloy is 5.0~15.0 wt%.

[0013] In a further preferred embodiment, the magnesium content in the copper-magnesium master alloy is 10.0~20.0 wt%.

[0014] Further preferably, the purity of the pure aluminum is ≥99.99%.

[0015] In actual operation, alloy liquid is obtained by melting in an electric furnace under a protective atmosphere.

[0016] In the preferred embodiment, the molten alloy is poured into a crystallizer for semi-continuous casting, and then the ingot is obtained after being rolled into a wrench.

[0017] In a preferred embodiment, the homogenization treatment temperature is 800~820℃ and the homogenization treatment time is 10~12h.

[0018] In this invention, the homogenization temperature is set below 0.95 times the peritectic transformation temperature to prevent overheating at the alloy grain boundaries. At the same time, a relatively high temperature above 800°C is maintained to accelerate atomic diffusion, shorten the homogenization time, and improve production efficiency.

[0019] In a further preferred embodiment, after the homogenization process is completed, the ingot is first allowed to cool naturally in the heating furnace to 650~700℃, and then the ingot is immediately cooled to below 40℃ by water cooling at a rate ≥80℃ / s.

[0020] In this invention, the above-mentioned cooling method after homogenization treatment results in a material with superior performance. This is because, firstly, ingots are typically large, and air cooling is slow, making it impossible to guarantee the absence of γ-phase precipitation in the copper matrix during air cooling. Secondly, if direct water cooling is used at a high homogenization temperature, the cooling water boils before the ingot reaches the eutectoid temperature of 618°C, significantly reducing the cooling rate. This prevents the ingot from reaching a cooling rate of 80°C / s when passing the eutectoid temperature of 618°C. Consequently, the alloy undergoes a partial eutectoid reaction β→α+γ as it passes through the eutectoid temperature region, with a small amount of γ-phase precipitating within the larger as-cast β-phase grains, which can become crack initiations during subsequent processing. In this invention, by first naturally cooling the ingot to 650-700°C in a furnace and then using water cooling, a water cooling rate ≥80°C / s can be ensured, preventing γ-phase precipitation during heat treatment and cooling, resulting in a beryllium copper alloy ingot with a completely α+β phase composition.

[0021] The preferred method is to heat the homogenized billet to 750℃~780℃ and hold it for 30~60 minutes, and then perform hot rolling.

[0022] Further preferred, the homogenized billet is heated to 750℃~780℃ at a heating rate of ≥20℃ / s. In this invention, the homogenized billet is rapidly heated to the holding temperature. If the heating rate is too slow, precipitates will form in the copper matrix, while rapid heating will allow the alloy to skip the precipitation temperature range and maintain a completely α+β phase composition.

[0023] In a preferred embodiment, the hot rolling process is as follows: first, 4 to 6 passes of reversing hot rolling, and then 3 to 5 passes of unidirectional hot rolling, wherein the deformation amount of the reversing hot rolling passes is 28% to 32%, and the deformation amount of the unidirectional hot rolling passes is 18% to 22%.

[0024] In a further preferred embodiment, the reversing angle of the reversing hot rolling is 90 degrees.

[0025] The inventors discovered that reversing hot rolling has a significant effect on the crushing of the second phase and improves the dispersion of the second phase, suppressing edge cracks during the rolling process. The γ phase changes from lamellar to ellipsoidal granular, reducing the pinning force of the γ phase at the interface. Changing the rolling direction can significantly reduce the anisotropy of the sheet and effectively control the strip to prevent side bending and wrinkling.

[0026] In a preferred embodiment, the annealing temperature of the hot-rolled billet is 750℃~780℃, and the holding time is 30~40min.

[0027] Further optimization involves air cooling after annealing at a rate of 0.5~5℃ / s.

[0028] In this invention, by controlling the cooling rate after annealing to 0.5~5℃ / s, the β phase in the alloy will be completely transformed into lamellar alternating α+γ phases, and there will be no needle-like γ phase in the copper matrix. This structure will exhibit excellent synergistic deformation ability in subsequent processing.

[0029] In a preferred embodiment, during the cyclic cold rolling-intermediate annealing process of the annealed billet, an intermediate annealing is performed once every 3 to 5 cold rolling passes.

[0030] In a preferred embodiment, during the cyclic cold rolling-intermediate annealing process of the annealed billet, the deformation amount of the 3 to 5 cold rolling passes performed before any intermediate annealing is as follows: the deformation amount of the first pass is 10% to 12%, the deformation amount of the second pass is 18% to 25%, and the deformation amount of the third and subsequent passes is 30% to 35%.

[0031] This invention employs a cyclic "cold rolling-intermediate annealing" process, which involves annealing after four cold rolling passes to remove work hardening. The maximum deformation per pass can reach 35%, significantly reducing the total number of processing passes and resulting in high production efficiency.

[0032] In a preferred embodiment, the cold rolling is performed to a thickness of 0.05~0.08mm above the finished material size.

[0033] In a preferred embodiment, the intermediate annealing temperature is 750℃~780℃, and the holding time is 30~40min.

[0034] Further optimization involves air cooling after any intermediate annealing is completed, with an air cooling rate of 0.5~5℃ / s.

[0035] In actual operation, after cold rolling, the strip is cleaned to remove the oxide layer and impurities on the surface. After cold rolling, it is finished by finishing through a tension bending and straightening unit and a slitting unit.

[0036] The preferred method involves 1 to 3 passes of finishing rolling, with a deformation amount of 10% to 15% per pass.

[0037] In the preferred embodiment, the annealing temperature of the finished product is 750℃~780℃, and the holding time is 10~15min.

[0038] Further optimization involves air cooling of the finished product after annealing, with an air velocity of 0.5~5℃ / s.

[0039] In a preferred embodiment, the high beryllium content beryllium copper alloy material is selected from one of sheet / strip, tube / bar, and wire, preferably sheet / strip.

[0040] Principles and advantages

[0041] In recent years, high-beryllium-content beryllium copper alloys have been widely studied and applied in various electronic components. Under high beryllium content, the second phase containing beryllium is more prone to phase transformation and precipitation during heat treatment and cooling. Its size, morphology, and distribution are key factors affecting the production of high-beryllium-content beryllium copper alloy strips. Common second phases are blocky β phase and acicular γ phase. The blocky β phase is formed by the reverse eutectoid reaction α+γ→β at 618~620℃. If it is directly cooled from this temperature to below 40℃ at a cooling rate of ≥80℃ / s, a beryllium copper alloy with the α+β phase is obtained. The acicular γ phase has two formation pathways: one is precipitation in the copper matrix after aging the alloy at 150~550℃; the other is a small amount of eutectoid reaction β→α+γ occurring at 315~620℃ when the alloy is cooled at a cooling rate of <80℃ / s. Both γ phases have adverse effects on the initial processing of the ingot. However, when the cooling rate is 0.5~5℃ / s, the β phase in the alloy will completely transform into lamellar alternating α+γ phases, and there will be no needle-like γ phase in the copper matrix. This microstructure will exhibit excellent synergistic deformation capability in subsequent processing. This invention mainly utilizes the different cooling rates of ingots and strips. Considering actual production efficiency, water cooling is used for ingots and air cooling is used for strips, respectively. This improves the microstructure of the material, promotes the rational distribution of hard phases in the metal, avoids the precipitation of harmful hard phases, reduces the material's deformation resistance while ensuring no cracking or breakage, and improves the yield.

[0042] The design of the deformation amount per rolling pass directly affects the microstructure, properties, and stability of the rolling process. A large deformation amount per pass can refine the internal grains of the material, helping to improve its strength and toughness, while reducing the number of passes, thus increasing processing efficiency and saving time and process costs. However, excessive deformation can lead to stress concentration, increasing the risk of material cracking or breakage, especially for high-hardness, low-plasticity materials. Simultaneously, the rolling mill equipment needs to withstand greater rolling forces, which may accelerate equipment wear and even lead to equipment failure. A small deformation amount can effectively avoid stress concentration, making the internal stress distribution of the material more uniform, thereby reducing the risk of cracking. However, too small a deformation amount per pass is insufficient to refine the grains, potentially leading to unsatisfactory mechanical properties. It also results in an increase in the number of rolling passes, a longer processing cycle, reduced production efficiency, and increased energy consumption and costs. This invention addresses the rational design of deformation amounts in hot and cold rolling processes, improving production efficiency while ensuring strip performance and quality.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] (1) The second phase composition is uniform:

[0045] Compared with existing heat treatment processes, the primary homogenization temperature of this invention is strictly controlled below 0.95 times the peritectic transformation temperature to prevent overheating at the alloy grain boundaries. Simultaneously, maintaining a high temperature above 800℃ accelerates atomic diffusion, shortens the homogenization time, and improves production efficiency. This invention employs water cooling during ingot homogenization. On one hand, ingot dimensions are typically large, and air cooling is slow, failing to guarantee the absence of γ-phase precipitation in the copper matrix. On the other hand, direct water cooling at high homogenization temperatures cannot achieve a cooling rate of 80℃ / s, causing partial eutectoid reaction β→α+γ to occur as the alloy passes through the eutectoid temperature zone. A small amount of γ-phase precipitates within the larger as-cast β-phase grains, becoming crack initiation points during subsequent processing. Therefore, this invention employs a two-stage homogenization process combined with water cooling to prevent γ-phase precipitation during heat treatment and cooling, resulting in a beryllium copper alloy ingot with a completely α+β phase composition.

[0046] (2) Fewer processing passes, higher production efficiency:

[0047] Compared with the rolling process in the prior art, the present invention adopts a hot working process that combines reversing hot rolling and unidirectional rolling. In the first 4 to 6 reversing hot rolling passes, a large deformation amount is used to reduce the total number of processing passes. The present invention adopts a cyclic "cold rolling-intermediate annealing" process, which performs annealing after 4 cold rolling passes to remove work hardening. The maximum deformation amount per pass can reach 35%, which significantly reduces the total number of processing passes and has high production efficiency.

[0048] (3) Good deformation performance:

[0049] The high beryllium content beryllium copper alloy strip prepared by the present invention adopts a two-stage homogenization heat treatment process, a reversing hot rolling process, and a cyclic "cold rolling-intermediate annealing" process. The second phase is uniform and consistent. During rolling deformation, the second phase deforms in synergy with the copper matrix, resulting in uniform metal rheology. The cyclic annealing process makes the cold-rolled strip significantly softened, and large deformation processing can be achieved under small tonnage rolling force.

[0050] (4) Fewer defects in the strip, resulting in a high yield:

[0051] Compared with the cold rolling process in the prior art, the present invention adopts air cooling for the annealing treatment of strips at all levels. The strip has a large heat dissipation area and cools faster. No γ phase precipitation occurs in the copper matrix, only the eutectoid reaction β→α+γ occurs, forming a stable α+γ phase beryllium copper alloy with a core-shell structure. This reduces the possibility of edge cracking in the material during subsequent rolling and improves the yield. At the same time, air cooling reduces the quenching stress of the strip compared with water cooling, which is conducive to obtaining strips with lower anisotropy and improving the yield. The present invention adopts a stepped deformation design for the further processing of annealed strips. The deformation of the first pass of annealed strips is small, controlled at 10%~12%, and the strips are shaped with a small deformation to eliminate thickness difference, wrinkling, etc. Then the deformation is increased to roll towards the thickness of the finished strip, producing high-quality, good strip shape, and defect-free high beryllium copper strips.

[0052] (5) Good secondary electron emission performance and long-term stability:

[0053] After sensitization and activation, high-beryllium-content beryllium copper alloys form a thicker BeO film on the surface. Since the BeO beryllium oxide film is the primary source of secondary electron emission, it exhibits superior secondary electron emission performance. The addition of Mg (magnesium oxide) allows MgO, another secondary electron emission source, to form on the surface of the finished strip after sensitization and activation. MgO works synergistically with BeO to emit secondary electrons, further enhancing performance. The addition of Al (alkaline oxide) results in the formation of an alumina film during sensitization and activation, which encapsulates both BeO and MgO, effectively preventing the secondary electron emission sources from failing upon exposure to air and extending the workpiece's service life. Attached Figure Description

[0054] Figure 1 This is a schematic flowchart illustrating a method for preparing a high-beryllium-content beryllium copper alloy strip according to an embodiment of the present invention.

[0055] Figure 2 This is a schematic diagram of the reversing rolling process;

[0056] Figure 3 The image shows the optical microstructure of the beryllium copper ingot obtained in step S2 of Example 1. The yellowish-brown phase is the α phase, and the white phase is the β phase. It can be seen that there are no precipitates in the β phase.

[0057] Figure 4 The optical microstructure of the beryllium copper ingot obtained in step S2 of the comparative example shows black needle-like precipitates in the white β phase. In the subsequent processing, the black needle-like precipitates will become crack sources.

[0058] Figure 5 The photo shows the beryllium copper strip obtained in step S6 of Example 1. It can be seen that the surface of the strip is smooth and free from defects such as side bending, wrinkling, and edge cracking.

[0059] Figure 6 The photo shows the beryllium copper strip obtained in step S6 of the comparative process. The process did not set a gradient cold rolling deformation amount, which resulted in defects such as side bending, wrinkling and cracking of the strip. Detailed Implementation

[0060] See Figure 1 This embodiment provides a method for preparing high beryllium content beryllium copper alloy strip, which is specifically completed according to the following steps:

[0061] S1: Take 99.99% electrolytic pure copper and beryllium copper master alloy with beryllium content of 5.0~15.0 wt%, copper-magnesium master alloy with magnesium content of 10.0~20.0 wt%, and pure aluminum with purity ≥99.99%. Prepare the materials according to the chemical composition of high beryllium copper strip, then melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0062] S2: The ingot obtained in step S1 is placed into an induction furnace with a protective atmosphere and heated to 800~820℃ for homogenization treatment. The temperature is held for 10~12 hours to eliminate ingot segregation. Then the induction furnace heating is stopped and the ingot is allowed to cool naturally to 650~700℃. Then the ingot is immediately cooled to below 40℃ by water cooling at a rate ≥80℃ / s to form a beryllium copper alloy with α+β phase.

[0063] S3: The ingot obtained in step S2 is placed back into the induction furnace and heated to 750℃~780℃ at a heating rate of 20~30℃ / s, held for 30~60 minutes, and then hot rolled. The first 4~6 passes are reversing hot rolling, with a reversing angle of 90 degrees. Figure 2 As shown, the first rolling direction is designated as RD1, the second rolling direction as RD2, the third rolling direction as RD1, the fourth rolling direction as RD2, and so on.

[0064] The deformation amount in each pass is 28%~32%, and the subsequent passes are unidirectional hot rolling with a deformation amount of 18%~22%, to obtain beryllium copper strip billet;

[0065] S4: Under a protective atmosphere, the beryllium copper strip billet is placed in a heating furnace at 750℃~780℃ and held at that temperature for 30~40 minutes for annealing. Then it is taken out and air-cooled to below 40℃ at a cooling rate of 0.5~5℃ / s to obtain an α+γ phase beryllium copper alloy.

[0066] S5: Perform multiple cold rolling operations on the annealed strip obtained in step S4, with annealing performed after every 4 passes. The deformation amounts for each pass are 10%~12%, 18%~25%, 30%~35%, and 30%~35%, respectively. The annealing temperature is 750℃~780℃, and the strip is held for 30~40 minutes. The strip is then removed and air-cooled to below 40℃ at a cooling rate of 0.5~5℃ / s.

[0067] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05~0.08mm above the finished strip size, and then clean it;

[0068] S7: The cleaned strip is subjected to 1 to 3 passes of precision rolling, with a deformation of 10% to 15% per pass, and then finished by a tension bending straightening unit and a slitting unit.

[0069] S8: Place the finished strip into a heating furnace at 750℃~780℃ and hold for 10~15 minutes to perform finished product annealing treatment, eliminate the stress of the strip, promote recovery and recrystallization, and form a uniform structure. Then take it out and air cool it to below 40℃ at a cooling rate of 0.5~5℃ / s to obtain high beryllium content beryllium copper alloy strip.

[0070] Example 1

[0071] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0072] Be: 2.8 wt%

[0073] Mg: 1.1 wt%

[0074] Al: 0.1 wt%

[0075] The balance is copper.

[0076] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 10.0 wt% beryllium content, copper-magnesium master alloy with 10 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0077] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 820°C for homogenization treatment. It is held at this temperature for 12 hours to eliminate ingot segregation. Then, the induction furnace heating is stopped and the ingot is allowed to cool naturally to 700°C. The ingot is then immediately cooled to below 40°C by water cooling at a rate ≥80°C / s to form a beryllium copper alloy with α+β phase.

[0078] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 780°C at a heating rate of 30°C / s. After holding at that temperature for 60 minutes, it is then hot rolled. The first 6 passes are reversible hot rolling with a reversal angle of 90 degrees and a pass deformation of 32%. The subsequent passes are unidirectional hot rolling with a pass deformation of 22%, resulting in beryllium copper strip billets.

[0079] S4: Under a protective atmosphere, the beryllium copper strip billet is placed into a heating furnace at 780°C and held at that temperature for 40 minutes for annealing. Then it is taken out and air-cooled to below 40°C at a cooling rate of 5°C / s to obtain an α+γ phase beryllium copper alloy.

[0080] S5: The annealed strip obtained in step S4 is subjected to multiple cold rollings, with annealing performed after each 4-pass rolling. The deformation amounts for each of the 4 passes are 12%, 25%, 35%, and 35%, respectively. The annealing temperature is 780℃, and the strip is held for 40 minutes. The strip is then removed and air-cooled to below 40℃ at a cooling rate of 5℃ / s.

[0081] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0082] S7: The cleaned strip is subjected to three passes of precision rolling, with a deformation of 15% per pass, and then finished by a tension bending and straightening unit and a slitting unit.

[0083] S8: Place the finished strip into a heating furnace and anneal at 750℃ for 15 minutes to perform finished product annealing treatment, eliminate stress in the strip, promote recovery and recrystallization, and form a uniform structure. Then take it out and air cool it to below 40℃ at a cooling rate of 5℃ / s to obtain high beryllium content beryllium copper alloy strip.

[0084] In this embodiment, the performance indicators of the alloy plate and strip are: tensile strength 1050MPa, yield strength 710MPa, and elongation 12.5%.

[0085] Example 2

[0086] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0087] Be: 3.2 wt%

[0088] Mg: 1.2 wt%

[0089] Al: 0.08 wt%

[0090] The balance is copper.

[0091] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 10.0 wt% beryllium content, copper-magnesium master alloy with 10 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0092] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 810°C for homogenization treatment. It is held for 11 hours to eliminate ingot segregation. Then the induction furnace heating is stopped and the ingot is cooled naturally to 680°C. Then the ingot is immediately cooled to below 40°C by water cooling at a rate of ≥80°C / s to form a beryllium copper alloy with α+β phase.

[0093] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 750°C at a heating rate of 25°C / s. After holding at this temperature for 40 minutes, it is then hot rolled. The first four passes are reversing hot rolling with a reversing angle of 90 degrees and a pass deformation of 30%. Subsequent passes are unidirectional hot rolling with a pass deformation of 20%, resulting in beryllium copper strip billets.

[0094] S4: Under a protective atmosphere, the beryllium copper strip billet is placed into a heating furnace at 750°C and held at that temperature for 30 minutes for annealing. Then it is taken out and air-cooled to below 40°C at a cooling rate of 3°C / s to obtain an α+γ phase beryllium copper alloy.

[0095] S5: The annealed strip obtained in step S4 is subjected to multiple cold rollings, with annealing performed after each 4-pass rolling. The deformation amounts for each of the 4 passes are 10%, 20%, 30%, and 35%, respectively. The annealing temperature is 750℃, and the strip is held for 30 minutes. The strip is then removed and air-cooled to below 40℃ at a cooling rate of 3℃ / s.

[0096] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0097] S7: The cleaned strip is subjected to two passes of precision rolling, with a deformation of 10% per pass, and then finished by a tension bending straightening unit and a slitting unit.

[0098] S8: Place the finished strip into a heating furnace and anneal at 780℃ for 10 minutes to perform finished product annealing treatment, eliminate stress in the strip, promote recovery and recrystallization, and form a uniform structure. Then take it out and air cool it to below 40℃ at a cooling rate of 3℃ / s to obtain high beryllium content beryllium copper alloy strip.

[0099] In this embodiment, the performance indicators of the alloy plate and strip are: tensile strength 1110MPa, yield strength 750MPa, and elongation 10.3%.

[0100] Example 3

[0101] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0102] Be: 3.8 wt%

[0103] Mg: 1.0 wt%

[0104] Al: 0.06 wt%

[0105] The balance is copper.

[0106] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 15.0 wt% beryllium content, copper-magnesium master alloy with 15 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0107] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 800°C for homogenization treatment. It is held for 10 hours to eliminate ingot segregation. Then the induction furnace heating is stopped and the ingot is cooled naturally to 650°C. Then the ingot is immediately cooled to below 40°C by water cooling at a rate of ≥80°C / s to form a beryllium copper alloy with α+β phase.

[0108] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 750°C at a heating rate of 20°C / s. After holding at this temperature for 30 minutes, it is then hot rolled. The first four passes are reversing hot rolling with a reversing angle of 90 degrees and a pass deformation of 28%. Subsequent passes are unidirectional hot rolling with a pass deformation of 18%, resulting in beryllium copper strip billets.

[0109] S4: Under a protective atmosphere, the beryllium copper strip billet is placed in a heating furnace at 750°C and held at that temperature for 30 minutes for annealing. Then it is taken out and air-cooled to below 40°C at a cooling rate of 1°C / s to obtain an α+γ phase beryllium copper alloy.

[0110] S5: The annealed strip obtained in step S4 is subjected to multiple cold rollings, with annealing performed after each 4-pass rolling. The deformation amounts for each of the 4 passes are 10%, 18%, 30%, and 30%, respectively. The annealing temperature is 750℃, and the strip is held for 30 minutes. The strip is then removed and air-cooled to below 40℃ at a cooling rate of 1℃ / s.

[0111] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0112] S7: The cleaned strip is subjected to two passes of precision rolling, with a deformation of 10% per pass, and then finished by a tension bending straightening unit and a slitting unit.

[0113] S8: Place the finished strip into a heating furnace and anneal at 750℃ for 10 minutes to perform finished product annealing treatment, eliminate stress in the strip, promote recovery and recrystallization, and form a uniform structure. Then take it out and air cool it to below 40℃ at a cooling rate of 1℃ / s to obtain high beryllium content beryllium copper alloy strip.

[0114] In this embodiment, the performance indicators of the alloy plate and strip are: tensile strength 1310MPa, yield strength 850MPa, and elongation 7.1%.

[0115] Comparative Example 1

[0116] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0117] Be: 2.7 wt%

[0118] Mg: 1.4 wt%

[0119] Al: 0.1 wt%

[0120] The balance is copper.

[0121] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 10.0 wt% beryllium content, copper-magnesium master alloy with 10 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0122] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 800°C for homogenization treatment. The furnace is held at 800°C for 12 hours to eliminate ingot segregation. Then, the ingot is immediately cooled to below 40°C by water cooling at a rate of ≥80°C / s.

[0123] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 750°C at a heating rate of 30°C / s. After holding at this temperature for 60 minutes, it is then hot rolled. The first four passes are reversing hot rolling with a reversing angle of 90 degrees and a pass deformation of 28%. Subsequent passes are unidirectional hot rolling with a pass deformation of 22%, resulting in beryllium copper strip billets.

[0124] S4: Under a protective atmosphere, the beryllium copper strip billet is placed in a heating furnace at 750°C and held at that temperature for 40 minutes for annealing. Then it is taken out and air-cooled to below 40°C at a cooling rate of 3°C / s.

[0125] S5: The annealed strip obtained in step S4 is subjected to multiple cold rollings, with annealing performed after each 4-pass rolling. The deformation amounts for each of the 4 passes are 10%, 18%, 30%, and 35%, respectively. The annealing temperature is 750℃, and the strip is held for 40 minutes. The strip is then removed and air-cooled to below 40℃ at a cooling rate of 5℃ / s.

[0126] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0127] S7: The cleaned strip is subjected to three passes of precision rolling, with a deformation of 10% per pass, and then finished by a tension bending straightening unit and a slitting unit.

[0128] S8: Place the finished strip into a heating furnace and anneal at 750°C for 10 minutes to perform finished product annealing treatment, eliminate stress in the strip, promote recovery and recrystallization, and then take it out and air cool to below 40°C at a cooling rate of 5°C / s to obtain high beryllium content beryllium copper alloy strip.

[0129] The performance indicators of the alloy plate and strip in this comparative example are: tensile strength 910MPa, yield strength 620MPa, and elongation 6.3%.

[0130] Comparative Example 2

[0131] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0132] Be: 2.7 wt%

[0133] Mg: 1.3 wt%

[0134] Al: 0.15 wt%

[0135] The balance is copper.

[0136] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 10.0 wt% beryllium content, copper-magnesium master alloy with 10 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0137] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 800°C for homogenization treatment. It is held at this temperature for 12 hours to eliminate ingot segregation. Then, the induction furnace heating is stopped and the ingot is allowed to cool naturally to 700°C. Then, the ingot is immediately cooled to below 40°C by water cooling at a rate ≥80°C / s to form a beryllium copper alloy with α+β phase.

[0138] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 780°C at a heating rate of 20~30°C / s. After holding at the temperature for 60 minutes, it is hot rolled with a deformation amount of 20% per pass to obtain beryllium copper strip billet.

[0139] S4: Under a protective atmosphere, the beryllium copper strip billet is placed into a heating furnace at 750°C and held at that temperature for 30 minutes for annealing. Then it is taken out and air-cooled to below 40°C at a cooling rate of 3°C / s to obtain an α+γ phase beryllium copper alloy.

[0140] S5: The annealed strip obtained in step S4 is subjected to multiple cold rollings, with annealing performed after each 4-pass rolling. The deformation amounts for each of the 4 passes are 10%, 18%, 30%, and 35%, respectively. The annealing temperature is 750℃, and the strip is held for 30 minutes. The strip is then removed and air-cooled to below 40℃ at a cooling rate of 5℃ / s.

[0141] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0142] S7: The cleaned strip is subjected to three passes of precision rolling, with a deformation of 10% per pass, and then finished by a tension bending straightening unit and a slitting unit.

[0143] S8: Place the finished strip into a heating furnace and anneal at 750℃ for 10 minutes to perform finished product annealing treatment, eliminate stress in the strip, promote recovery and recrystallization, and form a uniform structure. Then take it out and air cool to below 40℃ at a cooling rate of 5℃ / s to obtain high beryllium content beryllium copper alloy strip.

[0144] The performance indicators of the alloy plate and strip in this comparative example are: tensile strength 990MPa, yield strength 680MPa, and elongation 8.1%.

[0145] Comparative Example 3

[0146] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0147] Be: 2.8 wt%

[0148] Mg: 1.2 wt%

[0149] Al: 0.08 wt%

[0150] The balance is copper.

[0151] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 10.0 wt% beryllium content, copper-magnesium master alloy with 10 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0152] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 800°C for homogenization treatment. It is held at this temperature for 12 hours to eliminate ingot segregation. Then, the induction furnace heating is stopped and the ingot is allowed to cool naturally to 700°C. Then, the ingot is immediately cooled to below 40°C by water cooling at a rate ≥80°C / s to form a beryllium copper alloy with α+β phase.

[0153] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 750°C at a heating rate of 30°C / s. After holding at this temperature for 60 minutes, it is then hot rolled. The first 6 passes are reversible hot rolling with a reversal angle of 90 degrees and a pass deformation of 32%. The subsequent passes are unidirectional hot rolling with a pass deformation of 18%, resulting in beryllium copper strip billets.

[0154] S4: Under a protective atmosphere, the beryllium copper strip billet is placed into a heating furnace at 750°C and held at that temperature for 30 minutes for annealing. Then it is taken out and air-cooled to below 40°C at a cooling rate of 3°C / s to obtain an α+γ phase beryllium copper alloy.

[0155] S5: The annealed strip obtained in step S4 is subjected to multiple cold rolling processes with a deformation amount of 24% per pass. Annealing is performed after every 6 passes at a temperature of 750°C and a holding time of 30 minutes. The strip is then removed and air-cooled to below 40°C at a cooling rate of 4°C / s.

[0156] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0157] S7: The cleaned strip is subjected to two passes of precision rolling, with a deformation of 12% per pass, and then finished by a tension bending straightening unit and a slitting unit.

[0158] S8: Place the finished strip into a heating furnace and anneal at 750°C for 10 minutes to perform finished product annealing treatment, eliminate stress in the strip, promote recovery and recrystallization, and then take it out and air cool to below 40°C at a cooling rate of 5°C / s to obtain high beryllium content beryllium copper alloy strip.

[0159] The performance indicators of the alloy plate and strip in this comparative example are: tensile strength 1010MPa, yield strength 780MPa, and elongation 5.3%.

[0160] Comparative Example 4

[0161] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0162] Be: 3.5 wt%

[0163] Mg: 1.2 wt%

[0164] Al: 0.06 wt%

[0165] The balance is copper.

[0166] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 15.0 wt% beryllium content, copper-magnesium master alloy with 10 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0167] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 820°C for homogenization treatment. It is held at this temperature for 12 hours to eliminate ingot segregation. Then, the induction furnace heating is stopped and the ingot is allowed to cool naturally to 700°C. The ingot is then immediately cooled to below 40°C by water cooling at a rate ≥80°C / s to form a beryllium copper alloy with α+β phase.

[0168] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 780°C at a heating rate of 25°C / s. After holding at this temperature for 30 minutes, it is hot rolled. The first 5 passes are reversible hot rolling with a reversal angle of 90 degrees and a pass deformation of 29%. The subsequent passes are unidirectional hot rolling with a pass deformation of 20%, resulting in beryllium copper strip billets.

[0169] S4: Under a protective atmosphere, the beryllium copper strip billet is placed into a heating furnace at 780°C and held at that temperature for 30 minutes for annealing. Then it is taken out and water-cooled to below 40°C at a cooling rate of ≥80°C / s to obtain an α+β phase beryllium copper alloy.

[0170] S5: Perform multiple cold rolling operations on the annealed strip obtained in step S4, annealing after each 4 passes. The deformation amounts for each of the 4 passes are 11%, 21%, 30%, and 35%, respectively. The annealing temperature is 780℃, and the strip is held for 30 minutes. The strip is then removed and water-cooled to below 40℃ at a rate ≥80℃ / s.

[0171] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0172] S7: The cleaned strip is subjected to two passes of precision rolling, with a deformation of 12% per pass, and then finished by a tension bending straightening unit and a slitting unit.

[0173] S8: Place the finished strip into a heating furnace and anneal at 780℃ for 10 minutes to perform finished product annealing treatment, eliminate stress in the strip, promote recovery and recrystallization, and form a uniform structure. Then, take it out and water cool it to below 40℃ at a cooling rate of ≥80℃ / s to obtain high beryllium content beryllium copper alloy strip.

[0174] The performance indicators of the alloy plate and strip in this comparative example are: tensile strength 1260MPa, yield strength 960MPa, and elongation 1.9%.

[0175] Comparative Example 5

[0176] This embodiment specifically prepares a high beryllium content beryllium copper alloy strip. The high beryllium content beryllium copper alloy of this embodiment includes the following components:

[0177] Be: 3.8 wt%

[0178] Mg: 1.0 wt%

[0179] Al: 0.09 wt%

[0180] The balance is copper.

[0181] S1: Take 99.99% electrolytic pure copper, beryllium copper master alloy with 15.0 wt% beryllium content, copper-magnesium master alloy with 10 wt% magnesium content and 99.99% pure aluminum, and make the raw materials according to the chemical composition of high beryllium copper strip. Then, melt them in an inert atmosphere electric furnace to obtain an alloy solution, and then cast it into a crystallizer for semi-continuous casting and rolling to obtain the original ingot.

[0182] S2: The ingot obtained in step S1 is put into an induction furnace with a protective atmosphere and heated to 820°C for homogenization treatment. It is held at this temperature for 12 hours to eliminate ingot segregation. Then, the induction furnace heating is stopped and the ingot is allowed to cool naturally to 700°C. The ingot is then immediately cooled to below 40°C by water cooling at a rate ≥80°C / s to form a beryllium copper alloy with α+β phase.

[0183] S3: The ingot obtained in step S2 is put back into the induction furnace and heated to 780°C at a heating rate of 30°C / s. After holding at this temperature for 60 minutes, it is then hot rolled. The first 6 passes are reversible hot rolling with a pass deformation of 32%, and the subsequent passes are unidirectional hot rolling with a pass deformation of 22%, to obtain beryllium copper strip billet;

[0184] S4: Under a protective atmosphere, the beryllium copper strip billet is placed into a heating furnace at 780°C and held at that temperature for 40 minutes for annealing. Then it is taken out and air-cooled to below 40°C at a cooling rate of 5°C / s to obtain an α+γ phase beryllium copper alloy.

[0185] S5: The annealed strip obtained in step S4 is subjected to multiple cold rollings, with annealing performed after each 4-pass rolling. The deformation amounts for each of the 4 passes are 12%, 25%, 35%, and 35%, respectively. The annealing temperature is 780℃, and the strip is held for 40 minutes. The strip is then removed and air-cooled to below 40℃ at a cooling rate of 5℃ / s.

[0186] S6: Repeat step S5 to cold roll the beryllium copper strip to 0.05mm above the finished strip size, and then clean it;

[0187] S7: The cleaned strip is subjected to three passes of precision rolling with a deformation of 15% per pass. It is then finished by a tension straightening unit and a slitting unit to obtain a high beryllium content beryllium copper alloy strip.

[0188] In this embodiment, the performance indicators of the alloy plate and strip are: tensile strength 1310MPa, yield strength 1030MPa, and elongation 1.0%.

[0189]

Claims

1. A method for preparing a high-beryllium-content beryllium copper alloy material, characterized in that: Metal raw materials containing pure copper and beryllium copper master alloy are smelted to obtain alloy liquid, alloy liquid is cast to obtain ingot, ingot is homogenized to obtain homogenized billet, homogenized billet is hot rolled to obtain hot rolled billet, hot rolled billet is annealed to obtain annealed billet, annealed billet is cyclically cold rolled-intermediate annealed to obtain alloy strip, and finally alloy strip is precision rolled and finished product annealed to prepare high beryllium copper alloy material; The homogenization treatment temperature is 800~820℃, and the homogenization treatment time is 10~12h; After the homogenization process is completed, the ingot is first allowed to cool naturally in the heating furnace to 650~700℃, and then immediately cooled to below 40℃ by water cooling at a rate of ≥80℃ / s. After the annealing process is completed, air cooling is performed at a rate of 0.5~5℃ / s; After any intermediate annealing is completed, air cooling is performed at a rate of 0.5~5℃ / s; After the finished product is annealed, it is air-cooled at a rate of 0.5~5℃ / s.

2. The method for preparing a high beryllium content beryllium copper alloy material according to claim 1, characterized in that: The high beryllium content beryllium copper alloy material has the following composition by mass percentage: Be: 2.5 wt% to 4.0 wt%, Mg: 0.00 wt% to 2.00 wt%, Al: 0.00 wt% to 0.50 wt%, with the balance being copper.

3. The method for preparing a high beryllium content beryllium copper alloy material according to claim 1 or 2, characterized in that: The metal raw materials also include copper-magnesium master alloy and pure aluminum; The purity of the copper is ≥99.99%; The beryllium content in the beryllium-copper master alloy is 5.0~15.0 wt%; The magnesium content in the copper-magnesium master alloy is 10.0~20.0 wt%. The purity of the pure aluminum is ≥99.99%; The molten alloy is poured into a crystallizer for semi-continuous casting, and then rolled into a wrench to obtain an ingot.

4. The method for preparing a high beryllium content beryllium copper alloy material according to claim 1, characterized in that: The homogenized billet is heated to 750℃~780℃ and held for 30~60 minutes, and then hot rolled. The homogenized billet is heated to 750℃~780℃ at a heating rate of ≥20℃ / s; The hot rolling process is as follows: first, 4 to 6 passes of reversing hot rolling, followed by 3 to 5 passes of unidirectional hot rolling, wherein the deformation per pass of reversing hot rolling is 28% to 32%, and the deformation per pass of unidirectional hot rolling is 18% to 22%. The reversing angle of the hot rolling is 90 degrees.

5. A method for preparing a high beryllium content beryllium copper alloy material according to claim 1 or 4, characterized in that: The annealing temperature of the hot-rolled billet is 750℃~780℃, and the holding time is 30~40min.

6. The method for preparing a high beryllium content beryllium copper alloy material according to claim 1, characterized in that: During the cyclic cold rolling-intermediate annealing process of the annealed billet, an intermediate annealing is performed once every 3 to 5 cold rolling passes. During the cyclic cold rolling-intermediate annealing process of the annealed billet, the deformation amount of the 3 to 5 cold rolling passes before any intermediate annealing is as follows: the deformation amount of the first pass is 10% to 12%, the deformation amount of the second pass is 18% to 25%, and the deformation amount of the third and above passes is 30% to 35%.

7. A method for preparing a high beryllium content beryllium copper alloy material according to claim 1 or 6, characterized in that: The material is cold-rolled to a thickness of 0.05~0.08 mm above the finished material size; The intermediate annealing temperature is 750℃~780℃, and the holding time is 30~40min.

8. A method for preparing a high beryllium content beryllium copper alloy material according to claim 1 or 2, characterized in that: The finishing rolling process involves 1 to 3 passes, with a deformation rate of 10% to 15% per pass. The annealing temperature of the finished product is 750℃~780℃, and the holding time is 10~15min.

9. A method for preparing a high beryllium content beryllium copper alloy material according to claim 1 or 2, characterized in that: The high beryllium content beryllium copper alloy material is selected from one of the following: sheet and strip, tube and rod, and wire.

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