Heat treatment process for high-strength and high-elasticity beryllium copper alloy

Abstract

The invention discloses a heat treatment process for a high-strength and high-elasticity beryllium-copper alloy, and belongs to the field of copper-based alloys. The process is used for treating an H-state beryllium-copper alloy plate with the thickness of 0.05-1.5 mm, and comprises the following steps: solution treatment: under the protection of hydrogen / nitrogen mixed gas, loading the H-state beryllium-copper alloy plate into a vertical continuous quenching furnace which is provided with a started thermal circulating fan and is subjected to heat preservation for 4-6 minutes at the solution temperature of 770-820 DEG C, and carrying out solution treatment at the belt running speed of 6-10 m / min, so that the H-state beryllium-copper alloy plate is obtained; cooling the discharged plate to room temperature under the action of a two-stage cooling circulating fan to obtain a C-state beryllium copper alloy plate; and aging treatment is conducted, specifically, the vacuum degree of a box-type resistance furnace is set to reach a preset value, the furnace is filled with nitrogen, then the furnace is empty and heated to the aging temperature of 310-350 DEG C, heat preservation is conducted for 25-35 min, the C-state beryllium-copper alloy plate is loaded into the box-type resistance furnace, heat preservation is conducted for 3-4 h, then the C-state beryllium-copper alloy plate is cooled to the room temperature along with the furnace, and the target beryllium-copper alloy plate is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of copper-based alloys, and in particular relates to a heat treatment process for a high-strength and high-elasticity beryllium copper alloy. Background Art

[0002] Beryllium copper is a copper-based alloy with Be as the primary alloying element. It is a precipitation-strengthened alloy. After solution and aging treatment, it exhibits high strength, hardness, elasticity, corrosion resistance, wear resistance, fatigue resistance, impact resistance, and non-magnetic properties, making it the best among all copper alloys. Known as the "King of Elastic Materials," it has become an indispensable industrial material in contemporary economic development. It is widely used in electronics and communications, micro-components for new energy vehicles, relays, aerospace, and precision instrument and meter manufacturing.

[0003] Beryllium copper alloys (Be mass fraction 1.7-2.1wt%, Ni mass fraction 0.1-0.4wt%, Ti mass fraction 0.05-0.3wt%), with Ni and Ti as the primary doping elements, exhibit excellent strength, hardness, electrical conductivity, corrosion resistance, wear resistance, and thermal conductivity due to the inclusion of trace elements Ni and Ti. These alloys have broad application prospects in defense and military industries such as aerospace, marine engineering, and petrochemicals. Beryllium copper sheets are stamped into various parts, and depending on the complexity of the parts, customers have varying performance requirements for beryllium copper strip.

[0004] The performance of beryllium copper depends largely on heat treatment. Therefore, how to use vertical continuous quenching furnaces and box-type resistance furnaces for heat treatment is a difficult problem that needs to be solved urgently to achieve excellent performance of beryllium copper products. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes a high-strength and high-elasticity beryllium copper alloy heat treatment process. Before the conveyor belt solid solution treatment, the vertical continuous quenching furnace is preheated in an empty furnace and the matching solid solution temperature and conveyor belt speed are set so that the plate is heated evenly during the solid solution treatment process; before the box-type resistance furnace is used for aging treatment, the empty furnace is preheated and the matching aging temperature and holding time are set to achieve the high strength and high elasticity of the beryllium copper alloy.

[0006] The present invention provides a high-strength and high-elasticity beryllium copper alloy heat treatment method for treating H-state beryllium copper alloy plates with a thickness of 0.05-1.5 mm. The heat treatment method comprises:

[0007] Step S1, solution treatment:

[0008] Under the protection of hydrogen / nitrogen mixed gas, H-state beryllium copper alloy plates with a thickness of 0.05-1.5 mm are loaded into a vertical continuous quenching furnace with a hot circulation fan turned on and kept at a solution temperature of 770-820°C for 4-6 minutes. The plates are solution treated at a conveyor speed of 6-10 m / min. After being taken out of the furnace, they are cooled to room temperature under the action of a two-stage cooling circulation fan to obtain C-state beryllium copper alloy plates.

[0009] Wherein, the gas used by the two-stage cooling circulation fan is a hydrogen / nitrogen mixed gas;

[0010] Step S2, aging treatment:

[0011] The vacuum degree of the box-type resistance furnace is set to a preset value and the furnace is filled with nitrogen. The empty furnace is then heated to an aging temperature of 310-350° C. and kept warm for 25-35 minutes. The C-state beryllium copper alloy plate is placed in the box-type resistance furnace and kept warm for 3-4 hours, and then cooled to room temperature with the furnace to obtain the target beryllium copper alloy plate.

[0012] According to the heat treatment method for high-strength and high-elasticity beryllium copper alloy of the present invention, in step S1, the proportion of hydrogen in the hydrogen / nitrogen mixed gas is 21-25%.

[0013] According to the high-strength and high-elasticity beryllium copper alloy heat treatment method of the present invention, in step S1, when the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.05 mm and less than 0.5 mm, the rotation speed of the hot cycle fan is 800-1000 r / min, the first-stage rotation speed of the two-stage cooling cycle fan is 700-750 r / min, and the second-stage rotation speed is 550-650 r / min;

[0014] When the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.5 mm and less than 0.8 mm, the rotation speed of the heat circulation fan is 1150-1300 r / min, the first-stage rotation speed of the two-stage cooling circulation fan is 1000-1200 r / min, and the second-stage rotation speed is 900-1050 r / min;

[0015] When the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.8 and less than or equal to 1.5 mm, the rotation speed of the heat circulation fan is 1400-1600 r / min, the first-stage rotation speed of the two-stage cooling circulation fan is 1200-1250 r / min, and the second-stage rotation speed is 1000-1100 r / min.

[0016] According to the heat treatment method for high-strength and high-elasticity beryllium copper alloy of the present invention, in step S1, the temperature of the solution treatment is 780-810° C., and the tape travel speed is 7-9 m / min.

[0017] According to the high-strength and high-elasticity beryllium copper alloy heat treatment method of the present invention, in step S1, the H-state beryllium copper alloy plate comprises, by mass percentage, 1.7-2.1 wt% Be, 0.1-0.4 wt% Ni and 0.05-0.3 wt% Ti.

[0018] According to the heat treatment method for high-strength and high-elasticity beryllium copper alloy of the present invention, in step S1, H-state beryllium copper alloy plate is prepared by vacuum melting, casting, hot rolling and multi-pass cold rolling processes.

[0019] According to the heat treatment method for high-strength and high-elasticity beryllium copper alloy of the present invention, the temperature of the vacuum melting is 1200-1300°C.

[0020] According to the heat treatment method for high-strength and high-elasticity beryllium copper alloy of the present invention, the hot rolling temperature is 870-900°C.

[0021] According to the heat treatment method for high-strength and high-elasticity beryllium copper alloy of the present invention, the total processing rate of the multiple cold rolling passes is 33-40%, and the rolling force of each pass is 140-160t.

[0022] According to the heat treatment method for high-strength and high-elasticity beryllium copper alloy of the present invention, in step S2, the aging treatment temperature is 320-340°C, the empty furnace holding time is 28-32 minutes, and the plate holding time is 3.3-3.7 hours.

[0023] The solution proposed by the present invention has the following technical effects:

[0024] The present invention preheats an empty vertical continuous quenching furnace and sets a matching solution temperature and a belt speed before a belt-type solution treatment, so that the plate is heated evenly during the solution treatment process; and preheats an empty box-type resistance furnace and sets a matching aging temperature and a holding time before an aging treatment is performed in a box-type resistance furnace, so as to achieve high strength and high elasticity of the beryllium copper alloy.

[0025] In addition, compared with pure nitrogen and pure hydrogen, the present invention uses a hydrogen / nitrogen mixed gas with a specific volume ratio as a heat circulation gas and a furnace quenching gas, which can avoid excessive oxidation of the plate surface while ensuring safety, thereby simplifying the subsequent processing process.

[0026] In addition, for beryllium copper alloy plates of different thicknesses, the present invention sets different speeds of the heat circulation fan and the two-stage cooling circulation fan to further ensure that the plates are heated evenly during the solution treatment process and can be rapidly cooled to room temperature after being taken out of the furnace, thereby enhancing the grain structure uniformity and mechanical properties of the beryllium copper alloy.

[0027] In addition, the present invention adopts a vertical continuous quenching furnace and a box-type resistance furnace to perform a single solid solution and aging treatment on the beryllium copper alloy plate, and the process flow is greatly shortened and the energy consumption is low. DETAILED DESCRIPTION

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] This embodiment provides a high-strength and high-elasticity beryllium copper alloy heat treatment method for treating H-state beryllium copper alloy plates with a thickness of 0.05-1.5 mm. The heat treatment method includes:

[0030] Step S1, solution treatment:

[0031] Under the protection of hydrogen / nitrogen mixed gas, H-state beryllium copper alloy plates with a thickness of 0.05-1.5mm are loaded into a vertical continuous quenching furnace with a hot circulation fan turned on and kept at a solution temperature of 770-820℃ for 4-6min. Solution treatment is carried out at a conveyor speed of 6-10m / min. After being taken out of the furnace, the plates are cooled to room temperature under the action of a two-stage cooling circulation fan to obtain C-state beryllium copper alloy plates.

[0032] Wherein, the gas used by the two-stage cooling circulation fan is a hydrogen / nitrogen mixed gas.

[0033] Step S2, aging treatment:

[0034] The vacuum degree of the box-type resistance furnace is set to a preset value and the furnace is filled with nitrogen. The empty furnace is then heated to an aging temperature of 310-350° C. and kept warm for 25-35 minutes. The C-state beryllium copper alloy plate is placed in the box-type resistance furnace and kept warm for 3-4 hours, and then cooled to room temperature with the furnace to obtain the target beryllium copper alloy plate.

[0035] In some embodiments, in step S1 , the hydrogen content in the hydrogen / nitrogen mixed gas is 21-25%.

[0036] Preferably, the hydrogen / nitrogen mixed gas accounts for 23%.

[0037] In some embodiments, in step S1, when the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.05 mm and less than 0.5 mm, the rotation speed of the hot cycle fan is 800-1000 r / min, the first-stage rotation speed of the two-stage cooling cycle fan is 700-750 r / min, and the second-stage rotation speed is 550-650 r / min.

[0038] When the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.5 mm and less than 0.8 mm, the rotation speed of the heat circulation fan is 1150-1300 r / min, the first-stage rotation speed of the two-stage cooling circulation fan is 1000-1200 r / min, and the second-stage rotation speed is 900-1050 r / min.

[0039] When the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.8 and less than or equal to 1.5 mm, the rotation speed of the heat circulation fan is 1400-1600 r / min, the first-stage rotation speed of the two-stage cooling circulation fan is 1200-1250 r / min, and the second-stage rotation speed is 1000-1100 r / min.

[0040] In some embodiments, in step S1, the temperature of the solution treatment is 780-810° C., and the tape speed is 7-9 m / min.

[0041] In some embodiments, in step S1, the H-state beryllium copper alloy plate comprises, by mass percentage, 1.7-2.1 wt% Be, 0.1-0.4 wt% Ni, and 0.05-0.3 wt% Ti.

[0042] Preferably, the H-state beryllium copper alloy plate comprises, by mass percentage, 1.8-1.9 wt% of Be, 0.3-0.4 wt% of Ni, and 0.15-0.25 wt% of Ti.

[0043] In some embodiments, in step S1, the H-state beryllium copper alloy plate is prepared by vacuum melting, casting, hot rolling and multi-pass cold rolling processes.

[0044] Specifically, the raw materials for vacuum melting are composed of beryllium master alloy with a purity of not less than 10%, nickel with a purity of not less than 99.8%, sponge titanium with a purity of not less than 99.8%, and copper with a purity of not less than 99.5%.

[0045] Specifically, the specific process of the vacuum melting is as follows: a copper block is placed in a melting furnace, and after the copper block is completely melted, beryllium master alloy, nickel and sponge titanium are added.

[0046] Specifically, the size of the casting crystallizer is 400*100 mm.

[0047] In some embodiments, the vacuum melting temperature is 1200-1300°C.

[0048] In some embodiments, the hot rolling temperature is 870-900°C.

[0049] In some embodiments, the total processing rate of the multiple cold rolling passes is 33-40%, and the rolling force of each pass is 110-160t, preferably 140-160t.

[0050] In some embodiments, in step S2, the aging treatment temperature is 320-340°C, the empty furnace holding time is 28-32 minutes, and the plate holding time is 3.3-3.7 hours.

[0051] In some embodiments, in step S2, during the aging treatment, the vacuum degree of the box-type resistance furnace reaches 0.1 MPa.

[0052] Example 1

[0053] In the first step, a 0.8mm thick H-state beryllium copper alloy sheet was produced using vacuum melting, casting, hot rolling, and multi-pass cold rolling. The H-state beryllium copper alloy sheet, calculated by mass percentage, consisted of 1.88wt% Be, 0.35wt% Ni, and 0.2wt% Ti. The vacuum melting temperature was 1250°C, the hot rolling temperature was 885°C, and the total processing rate of the multi-pass cold rolling was 38%, with a rolling force of 140t per pass.

[0054] The second step is solution treatment: Under the protection of a hydrogen / nitrogen mixture with a hydrogen content of 23%, the H-state beryllium copper alloy sheet with a thickness of 0.8mm is placed in a vertical continuous quenching furnace with a hot circulation fan turned on and kept at a solution temperature of 800°C for 5 minutes. The solution treatment is carried out at a conveyor speed of 8m / min. After being removed from the furnace, the sheet is cooled to room temperature under the action of a two-stage cooling circulation fan to obtain the C-state beryllium copper alloy sheet. The gas used by the two-stage cooling circulation fan is a hydrogen / nitrogen mixture with a hydrogen content of 23%. The speed of the hot circulation fan is 1500r / min, and the speed of the first stage of the two-stage cooling circulation fan is 1230r / min, and the speed of the second stage is 1050r / min.

[0055] The third step is aging treatment: the vacuum degree of the box-type resistance furnace is set to 0.1 MPa and the furnace is filled with nitrogen. Then, the empty furnace is heated to an aging temperature of 330°C and kept warm for 30 minutes. The C-state beryllium copper alloy plate is placed in the box-type resistance furnace and kept warm for 3.5 hours. After that, the beryllium copper alloy plate is cooled to room temperature with the furnace to obtain the target beryllium copper alloy plate.

[0056] The mechanical properties of the C-state beryllium copper alloy plate and the target beryllium copper alloy plate were tested using an AG-IC 50kN universal tensile testing machine and an HVS-5 automatic turret digital display microhardness tester. The results are as follows:

[0057] C state beryllium copper alloy plate: hardness HV: 105, tensile strength Rm: 487MPa, yield strength Rp0.2: 228MPa, elongation δ: 51%, grain size: 0.226mm.

[0058] Target beryllium copper alloy plate: hardness HV: 431, tensile strength Rm: 1251 MPa, yield strength Rp0.2: 1009 MPa, elongation δ: 12%.

[0059] Example 2

[0060] In the first step, a 0.6mm thick H-state beryllium copper alloy sheet was produced using vacuum melting, casting, hot rolling, and multi-pass cold rolling. The H-state beryllium copper alloy sheet, calculated by mass percentage, contained 1.7wt% Be, 0.4wt% Ni, and 0.3wt% Ti. The vacuum melting temperature was 1200°C, the hot rolling temperature was 870°C, and the total processing rate of the multi-pass cold rolling was 35%, with a rolling force of 110t per pass.

[0061] The second step is solution treatment: Under the protection of a hydrogen / nitrogen mixed gas with a hydrogen content of 21%, the H-state beryllium copper alloy plate with a thickness of 0.6mm is placed in a vertical continuous quenching furnace with a hot circulation fan turned on and kept at a solution temperature of 770°C for 6 minutes. The solution treatment is carried out at a conveyor speed of 6m / min. After being removed from the furnace, the plate is cooled to room temperature under the action of a two-stage cooling circulation fan to obtain the C-state beryllium copper alloy plate. The gas used by the two-stage cooling circulation fan is a hydrogen / nitrogen mixed gas with a hydrogen content of 21%; the speed of the hot circulation fan is 1200r / min, and the speed of the first stage of the two-stage cooling circulation fan is 1100r / min, and the speed of the second stage is 950r / min.

[0062] The third step is aging treatment: the vacuum degree of the box-type resistance furnace is set to 0.1 MPa and the furnace is filled with nitrogen. Then, the empty furnace is heated to an aging temperature of 310°C and kept warm for 35 minutes. The C-state beryllium copper alloy plate is placed in the box-type resistance furnace and kept warm for 4 hours. After that, the beryllium copper alloy plate is cooled to room temperature with the furnace to obtain the target beryllium copper alloy plate.

[0063] The mechanical properties of the C-state beryllium copper alloy plate and the target beryllium copper alloy plate were tested using an AG-IC 50kN universal tensile testing machine and an HVS-5 automatic turret digital display microhardness tester. The results are as follows:

[0064] C state beryllium copper alloy plate: hardness HV: 180, tensile strength Rm: 556MPa, yield strength Rp0.2: 300MPa, elongation δ: 35%, grain size: 0.435mm.

[0065] Target beryllium copper alloy plate: hardness HV: 384, tensile strength Rm: 1321 MPa, yield strength Rp0.2: 1151 MPa, elongation δ: 6.5%.

[0066] Example 3

[0067] In the first step, a 0.3mm thick H-state beryllium copper alloy sheet was produced through vacuum melting, casting, hot rolling, and multi-pass cold rolling. The H-state beryllium copper alloy sheet, calculated by mass percentage, contained 2.1wt% Be, 0.1wt% Ni, and 0.05wt% Ti. The vacuum melting temperature was 1300°C, the hot rolling temperature was 900°C, and the total processing rate of the multi-pass cold rolling was 40%, with a rolling force of 160t per pass.

[0068] The second step is solution treatment: Under the protection of a hydrogen / nitrogen mixture with a hydrogen content of 25%, the H-state beryllium copper alloy sheet with a thickness of 0.3mm is placed in a vertical continuous quenching furnace with a hot circulation fan turned on and kept at a solution temperature of 820°C for 4 minutes. The solution treatment is carried out at a conveyor speed of 10m / min. After being removed from the furnace, the sheet is cooled to room temperature under the action of a two-stage cooling circulation fan to obtain the C-state beryllium copper alloy sheet. The gas used by the two-stage cooling circulation fan is a hydrogen / nitrogen mixture with a hydrogen content of 25%. The speed of the hot circulation fan is 900r / min, and the speed of the first stage of the two-stage cooling circulation fan is 700r / min, and the speed of the second stage is 600r / min.

[0069] The third step is aging treatment: the vacuum degree of the box-type resistance furnace is set to 0.1 MPa and the furnace is filled with nitrogen. Then, the empty furnace is heated to an aging temperature of 350°C and kept warm for 25 minutes. The C-state beryllium copper alloy plate is placed in the box-type resistance furnace and kept warm for 3 hours. After that, the beryllium copper alloy plate is cooled to room temperature with the furnace to obtain the target beryllium copper alloy plate.

[0070] The mechanical properties of the C-state beryllium copper alloy plate and the target beryllium copper alloy plate were tested using an AG-IC 50kN universal tensile testing machine and an HVS-5 automatic turret digital display microhardness tester. The results are as follows:

[0071] C state beryllium copper alloy plate: hardness HV: 158, tensile strength Rm: 530MPa, yield strength Rp0.2: 298MPa, elongation δ: 41%, grain size: 0.312mm.

[0072] Target beryllium copper alloy plate: hardness HV: 405, tensile strength Rm: 1297 MPa, yield strength Rp0.2: 1118 MPa, elongation δ: 7.3%.

[0073] In summary, the solution proposed in the present invention has the following technical effects:

[0074] The present invention preheats an empty vertical continuous quenching furnace and sets a matching solution temperature and a belt speed before a belt-type solution treatment, so that the plate is heated evenly during the solution treatment process; and preheats an empty box-type resistance furnace and sets a matching aging temperature and a holding time before an aging treatment is performed in a box-type resistance furnace, so as to achieve high strength and high elasticity of the beryllium copper alloy.

[0075] In addition, compared with pure nitrogen and pure hydrogen, the present invention uses a hydrogen / nitrogen mixed gas with a specific volume ratio as a heat circulation gas and a furnace quenching gas, which can avoid excessive oxidation of the plate surface while ensuring safety, thereby simplifying the subsequent processing process.

[0076] In addition, for beryllium copper alloy plates of different thicknesses, the present invention sets different speeds of the heat circulation fan and the two-stage cooling circulation fan to further ensure that the plates are heated evenly during the solution treatment process and can be rapidly cooled to room temperature after being taken out of the furnace, thereby enhancing the grain structure uniformity and mechanical properties of the beryllium copper alloy.

[0077] In addition, the present invention adopts a vertical continuous quenching furnace and a box-type resistance furnace to perform a single solid solution and aging treatment on the beryllium copper alloy plate, and the process flow is greatly shortened and the energy consumption is low.

[0078] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A high-strength and high-elasticity beryllium copper alloy heat treatment method for treating H-state beryllium copper alloy plates with a thickness of 0.05-1.5 mm, characterized in that: The heat treatment method comprises: Step S1, solution treatment: Under the protection of hydrogen / nitrogen mixed gas, H-state beryllium copper alloy plates with a thickness of 0.05-1.5 mm are loaded into a vertical continuous quenching furnace with a hot circulation fan turned on and kept at a solution temperature of 770-820°C for 4-6 minutes. The plates are solution treated at a conveyor speed of 6-10 m / min. After being taken out of the furnace, they are cooled to room temperature under the action of a two-stage cooling circulation fan to obtain C-state beryllium copper alloy plates. Wherein, the gas used by the two-stage cooling circulation fan is a hydrogen / nitrogen mixed gas; Step S2, aging treatment: The vacuum degree of the box-type resistance furnace is set to a preset value and the furnace is filled with nitrogen. The empty furnace is then heated to an aging temperature of 310-350° C. and kept warm for 25-35 minutes. The C-state beryllium copper alloy plate is placed in the box-type resistance furnace and kept warm for 3-4 hours, and then cooled to room temperature with the furnace to obtain the target beryllium copper alloy plate.

2. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 1, characterized in that: In the step S1, the hydrogen / nitrogen mixed gas contains 21-25% hydrogen.

3. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 1, characterized in that: In step S1, when the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.05 mm and less than 0.5 mm, the rotation speed of the hot cycle fan is 800-1000 r / min, the first-stage rotation speed of the two-stage cooling cycle fan is 700-750 r / min, and the second-stage rotation speed is 550-650 r / min; When the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.5 mm and less than 0.8 mm, the rotation speed of the heat circulation fan is 1150-1300 r / min, the first-stage rotation speed of the two-stage cooling circulation fan is 1000-1200 r / min, and the second-stage rotation speed is 900-1050 r / min; When the thickness of the H-state beryllium copper alloy plate is greater than or equal to 0.8 and less than or equal to 1.5 mm, the rotation speed of the heat circulation fan is 1400-1600 r / min, the first-stage rotation speed of the two-stage cooling circulation fan is 1200-1250 r / min, and the second-stage rotation speed is 1000-1100 r / min.

4. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 1, characterized in that: In the step S1, the temperature of the solution treatment is 780-810° C., and the belt speed is 7-9 m / min.

5. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 1, characterized in that: In step S1, the H-state beryllium copper alloy plate comprises, by mass percentage, 1.7-2.1 wt% of Be, 0.1-0.4 wt% of Ni, and 0.05-0.3 wt% of Ti.

6. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 1, characterized in that: In step S1, H-state beryllium copper alloy plate is prepared by vacuum melting, casting, hot rolling and multi-pass cold rolling processes.

7. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 6, characterized in that: The temperature of the vacuum melting is 1200-1300°C.

8. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 6, characterized in that: The hot rolling temperature is 870-900°C.

9. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 6, characterized in that: The total processing rate of the multi-pass cold rolling is 33-40%, and the rolling force of each pass is 110-160t.

10. The heat treatment method for high-strength and high-elasticity beryllium copper alloy according to claim 1, characterized in that: In step S2, the aging treatment temperature is 320-340°C, the empty furnace holding time is 28-32 minutes, and the plate holding time is 3.3-3.7 hours.