High-strength high-conductivity copper alloy sheet and strip and method of making same

Abstract

The application discloses a high-strength and high-conductivity copper alloy plate strip and a preparation method thereof, and belongs to the technical field of non-ferrous metal alloys. The preparation method comprises the following steps: S1, ingredient preparation: preparing raw materials; S2, smelting: melting the raw materials; S3, casting: casting the melt; S4, hot rolling: hot rolling the cast ingot; S5, solid solution: solid-solutionizing the hot-rolled blank; S6, face milling: removing the oxide skin on the surface of the solid-solutionized blank; S7, primary rolling: primary rolling the blank after face milling; S8, annealing: annealing the primary-rolled plate strip; S9, finish rolling: finish rolling the annealed plate strip; and S10, annealing: annealing the finish-rolled plate strip. The alloy is mainly strengthened by deformation strengthening and aging strengthening. After aging treatment, the alloy is dispersedly distributed with strengthening phases, mainly including single-element Cr, Cu3Zr and NiX phases. The key lies in the combination and adjustment of the NiX phases, so that the added elements are fully precipitated, and the influence on the electrical conductivity is minimized.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal alloy technology, specifically to a high-strength, high-conductivity copper alloy plate and strip and its preparation method. Background Technology

[0002] High-strength, high-conductivity copper alloys are widely used functional materials, primarily in the electrical industry for manufacturing lead frames, contact wires, and magnetic field conductors. However, with the rapid development of my country's electrical industry, the strength and conductivity of traditional copper alloys can no longer meet current industrial demands. Furthermore, when using traditional methods to prepare copper alloys, conductivity is inevitably reduced during the preparation process to achieve high strength. With continuous scientific advancements, new preparation methods are being discovered, providing direction for the production of high-strength, high-conductivity copper alloys. Currently, the market is proposing the concept of "double 70" copper alloys, meaning a conductivity ≥70% IACS and a strength ≥700MPa. This type of alloy possesses both excellent conductivity and strength, making it highly sought after in the market and expected to become the main material for the next generation of high-strength, high-conductivity copper alloys.

[0003] Currently, the standard properties of chromium-zirconium copper alloys are 400-600 MPa in strength and >75% IACS in electrical conductivity. In some applications, the conductivity is excessive, but the strength is not high enough. Copper-nickel-silicon alloys have a strength of 700-900 MPa and an electrical conductivity of 40-60% IACS, which is high in strength but insufficient in electrical conductivity, making it difficult to meet the requirements of high-strength, high-conductivity copper alloys.

[0004] Current technology improves the conductivity and strength of copper alloys by adding rare earth elements to meet the "double 70" technical requirements. However, rare earth elements are expensive and difficult to add, which significantly increases the production cost of copper alloys. This makes them unsuitable for the large-scale promotion of high-strength and high-conductivity copper alloys and severely limits their application. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a high-strength, high-conductivity copper alloy plate and strip, and a method for preparing the same.

[0006] The technical solution of this invention is: a high-strength, high-conductivity copper alloy plate and strip and its preparation method, comprising the following steps:

[0007] S1. Ingredients:

[0008] Prepare nickel plates, zirconium-chromium alloy, rare earth powder, electrolytic copper plates, and Cu-X alloy blocks, and mix the raw materials according to the following mass percentage content: Cr: 0.5-1.2%, Ni: 0.5-1.5%, Zr: 0.05-0.25%, X: 0.05-0.25%, rare earth: 0.05%, with the balance being Cu;

[0009] X is one or more of the elements Si, Fe, Sn, Ag, Ti, Al, and Nb;

[0010] S2, Smelting:

[0011] The prepared nickel plate, zirconium-chromium alloy, electrolytic copper plate, and Cu-X alloy block are loaded into the furnace and heated to melt. After complete melting, a deoxidizer is added, which accounts for 0.5-1% of the total mass of the melt. Then rare earth powder is added. The stirring speed is 50-60 r / min. After stirring for 20-30 minutes, the melt is taken out of the furnace to obtain the melt.

[0012] S3, Casting:

[0013] The melt obtained in step S2 is poured into the crystallizer and casting begins. The casting speed is 60-80 mm / min. Vibration casting is used in the casting process to obtain ingots with qualified composition.

[0014] S4, Hot Rolled:

[0015] The ingot obtained in step S3 is placed in a resistance furnace and heated at 930-950℃ for 2-4 hours, and then hot rolled. The number of hot rolling passes is 7. After hot rolling, the ingot is hollowly rolled to obtain a hot-rolled billet.

[0016] S5, Solid Solution:

[0017] The hot-rolled billet obtained in step S4 is placed in an electric resistance furnace, heated to 980°C, held for 2 hours, and then cooled to room temperature to obtain a solution-treated billet.

[0018] S6, Milling surface:

[0019] After the solution-treated billet obtained in step S5 is uncoiled on an uncoiler, it is milled from top to bottom using a double-sided milling machine. The thickness of each milling on one side is 0.5-1.0 mm to remove the oxide scale on the surface of the hot-rolled billet, and the milled billet is obtained.

[0020] S7, Preliminary rolling:

[0021] The milled billet obtained in step S7 is subjected to 7 passes of reversible rolling using a four-roll reversible primary rolling mill, with a total cold rolling rate of 60-80%. This yields cold-rolled strip.

[0022] S8, Annealing:

[0023] The cold-rolled strip obtained in step S7 is annealed in a bell jar annealing furnace under atmosphere protection. The heating time is 2 hours, the holding temperature is 400-500℃, and the holding time is 4-5 hours. After the temperature drops to below 40℃, the strip is taken out of the furnace to obtain the annealed strip.

[0024] S9, Finished Rolling:

[0025] The annealed strip obtained in step S8 is subjected to 7 reversible rolling passes using a four-roll reversible finishing mill, with a total cold rolling rate of 40-60%, to obtain a finished strip.

[0026] S10, Annealing:

[0027] The finely rolled strip obtained in step S9 is annealed in a bell jar annealing furnace under atmosphere protection. The heating time is 1.5 hours, the holding temperature is 300-400℃, and the holding time is 4-5 hours. The strip is removed from the furnace when the temperature drops below 40℃ to obtain the final product.

[0028] Further, the deoxidizer described in step S2 is composed of the following components in parts by weight: 1-3 parts yttrium powder, 1-2 parts erbium powder, 0.5-1 part europium powder, 7-8 parts Ti, and 5-10 parts Ni-Mg alloy powder.

[0029] Note: The above-mentioned deoxidizer can effectively reduce the oxygen content in the melt and improve the strength of the alloy.

[0030] Furthermore, in step S1, the mass percentage content of element X in the Cu-X alloy block of step S1 is 5-10%, with the balance being Cu.

[0031] Note: The above elements can effectively improve the strength of the alloy;

[0032] Furthermore, the heating rate in step S2 is 8-12℃ / min, and the temperature is increased to 1350-1400℃.

[0033] Note: Excessively high heating rates can lead to disorder within the metal system, increasing the melting point of the metal and reducing the melting speed. Conversely, excessively low heating rates result in slow melting, which also reduces the melting efficiency of the metal.

[0034] Furthermore, in step S3, the melt outlet temperature during vibration casting is 1350-1400℃, the pouring temperature is 1250-1400℃, the casting frequency during vibration casting is 1500-2000Hz, and the amplitude is 1-2mm.

[0035] Note: The above-mentioned furnace exit temperature ensures that the melt temperature during casting will not be too low. Vibration casting significantly refines the alloy grains, improving the density, mechanical properties, and metallographic grade of the casting.

[0036] Furthermore, in step S4, the initial rolling temperature of hot rolling is 900℃, the final rolling temperature is 750-900℃, the total hot rolling rate is 70-80%, and the speed of hollow coiling is 1-2m / min.

[0037] Note: Hot rolling at the above-mentioned hot rolling temperature is beneficial to improving the lightness and elongation of the sheet.

[0038] Furthermore, in step S6, the milling cutter rotation speed is 800-1000 r / min, and the feed rate is 1-2 mm / r.

[0039] Note: The above parameters for rotational speed and feed rate are beneficial for improving the surface finish of the workpiece.

[0040] Furthermore, the argon gas used for atmosphere protection in steps S8 and S10 has a purity of ≥99%, and the pressure of the bell annealing furnace is 99-105 kPa.

[0041] Note: Higher purity furnaces have lower oxygen content, which helps improve the strength of the plate material. The furnace pressure is basically the same as the external pressure, which can effectively reduce the pressure on the furnace wall and extend the service life of the bell annealing furnace.

[0042] Furthermore, in steps S7 and S9, the cold rolling temperature for the initial rolling and finishing rolling is 10-35℃, and the average rolling pressure per pass for the initial rolling is 50 N / mm. 2 The average rolling pressure per pass in the finishing mill is 40 N / mm. 2 .

[0043] Note: Under the above rolling pressure, cold rolling has the best effect and high efficiency.

[0044] Furthermore, in step S1, the rare earth powder is one or more of the elements La, Ce, and Y.

[0045] Note: The addition of the above elements to the alloy can effectively improve the tensile strength of the alloy sheet.

[0046] The beneficial effects of this invention are:

[0047] (1) The alloy is Cu-Cr-Zr-Ni-X-rare earth, where rare earth is one or more of La, Ce, Y, etc., and X is one or more of Si, Fe, Sn, Ag, Ti, Al, Nb, etc. The composition design of this invention mainly adds other elements to the conventional Cu-Cr-Zr alloy, which significantly improves the alloy strength. The alloy prepared by this invention has a conductivity ≥70% IACS and a tensile strength ≥700MPa.

[0048] (2) The main strengthening of this alloy is deformation strengthening + aging strengthening. After aging treatment, the alloy precipitates a dispersed strengthening phase, mainly elemental Cr, Cu3Zr and NiX phases. The key is to adjust the NiX combination to ensure that the added elements are fully precipitated and to minimize the impact on electrical conductivity. Attached Figure Description

[0049] Figure 1 This is a flowchart of the preparation process of the present invention.

[0050] Figure 2 This is a metallographic diagram of the finished alloy of the present invention. Detailed Implementation

[0051] Example 1:

[0052] like Figure 1 As shown, a high-strength, high-conductivity copper alloy plate / strip and its preparation method include the following steps:

[0053] S1. Ingredients:

[0054] Prepare nickel plates, zirconium-chromium alloy, rare earth powder, electrolytic copper plates, and Cu-X alloy blocks, and mix the raw materials according to the following mass percentage ratio: Cr: 0.6%, Ni: 0.8%, Zr: 0.15%, X: 0.12%, rare earth: 0.05%, with the balance being Cu; X is one or more elements selected from Si, Fe, Sn, Ag, Ti, Al, and Nb; the mass percentage content of element X in the Cu-X alloy block is 5%, with the balance being Cu; the rare earth powder is one or more elements selected from La, Ce, and Y.

[0055] S2, Smelting:

[0056] The prepared nickel plate, zirconium-chromium alloy, electrolytic copper plate, and Cu-X alloy block are loaded into the furnace and heated to melt at a rate of 8°C / min until they reach 1350°C. After complete melting, a deoxidizer is added, which accounts for 0.5% of the total mass of the melt. Then rare earth powder is added, and the stirring speed is 50 r / min. After stirring continuously for 20 minutes, the melt is removed from the furnace.

[0057] The deoxidizer is composed of the following components in parts by weight: 1 part yttrium powder, 1 part erbium powder, 0.5 parts europium powder, 7 parts Ti, and 5 parts Ni-Mg alloy powder.

[0058] S3, Casting:

[0059] The melt obtained in step S2 is poured into the crystallizer and casting begins. The casting speed is 60-80 mm / min. Vibration casting is used in the casting process. The melt exit temperature is 1350℃ and the pouring temperature is 1250℃. The casting frequency is 1500 Hz and the amplitude is 1 mm, resulting in an ingot with qualified composition.

[0060] S4, Hot Rolled:

[0061] The ingot obtained in step S3 is placed in a resistance furnace for heating and held at 930°C for 2 hours, and then hot rolled. The initial rolling temperature of the hot rolling is 900°C, the final rolling temperature is 755°C, the total hot rolling rate is 70%, the hollow coiling speed is 1 m / min, and the number of hot rolling passes is 7. After hot rolling, the ingot is hollowly coiled to obtain a hot-rolled billet.

[0062] S5, Solid Solution:

[0063] The hot-rolled billet obtained in step S4 is placed in an electric resistance furnace, heated to 980°C, held for 2 hours, and then cooled to room temperature to obtain a solution-treated billet.

[0064] S6, Milling surface:

[0065] After the solution-treated billet obtained in step S5 is uncoiled on an uncoiler, it is milled on both sides using a double-sided milling machine. The thickness of each side is 0.5 mm, the milling cutter speed is 800 r / min, and the feed rate is 1 mm / r. The oxide scale on the surface of the hot-rolled billet is removed to obtain the milled billet.

[0066] S7, Preliminary rolling:

[0067] The milled billet obtained in step S7 is subjected to 7 passes of reversible rolling using a four-high reversible primary rolling mill, with an average rolling pressure of 50 N / mm per pass. 2 The cold rolling temperature is 10℃, and the total cold rolling rate is 60-80%. Cold-rolled sheet and strip are obtained.

[0068] S8, Annealing:

[0069] The cold-rolled strip obtained in step S7 is annealed in a bell jar annealing furnace under atmosphere protection. The atmosphere protection uses argon gas with a purity of 99.1%, the bell jar annealing furnace pressure is 99 kP, the heating time is 2 hours, the holding temperature is 400℃, the holding time is 4 hours, and the strip is taken out of the furnace when the temperature drops to 39℃ to obtain the annealed strip.

[0070] S9, Finished Rolling:

[0071] The annealed strip obtained in step S8 is subjected to 7 passes of reversible rolling using a four-high reversible finishing mill. The cold rolling temperature is 10℃, and the average rolling pressure per pass is 40N / mm. 2 The total processing rate of cold rolling is 40%, resulting in finished rolled strip;

[0072] S10, Annealing:

[0073] The refined rolled strip obtained in step S9 is subjected to atmosphere-protected annealing in a bell jar annealing furnace. The atmosphere used for protection is argon gas with a purity of 99.2%. The pressure of the bell jar annealing furnace is 99 kP. The heating time is 1.5 h, the holding temperature is 300 °C, and the holding time is 4 h. When the temperature drops to 39 °C, the final product is obtained.

[0074] Example 2:

[0075] like Figure 1 As shown, Figure 1As shown, a high-strength, high-conductivity copper alloy plate / strip and its preparation method include the following steps:

[0076] S1. Ingredients:

[0077] Prepare nickel plates, zirconium-chromium alloy, rare earth powder, electrolytic copper plates, and Cu-X alloy blocks, and mix the raw materials according to the following mass percentage ratio: Cr: 1%, Ni: 1%, Zr: 0.2%, X: 0.12%, rare earth: 0.05%, with the balance being Cu; X is one or more elements selected from Si, Fe, Sn, Ag, Ti, Al, and Nb; the mass percentage content of element X in the Cu-X alloy block is 8%, with the balance being Cu; the rare earth powder is one or more elements selected from La, Ce, and Y.

[0078] S2, Smelting:

[0079] The prepared nickel plate, zirconium-chromium alloy, electrolytic copper plate, and Cu-X alloy block are loaded into the furnace and heated to melt at a rate of 10°C / min until they reach 1380°C. After complete melting, a deoxidizer is added, which accounts for 0.8% of the total mass of the melt. Then rare earth powder is added, and the stirring speed is 55 r / min. After stirring continuously for 25 min, the melt is removed from the furnace.

[0080] The deoxidizer is composed of the following components in parts by weight: 2 parts yttrium powder, 1.5 parts erbium powder, 0.8 parts europium powder, 7.5 parts Ti, and 6 parts Ni-Mg alloy powder.

[0081] S3, Casting:

[0082] The melt obtained in step S2 is poured into the crystallizer to start casting. The casting speed is 70 mm / min. Vibration casting is used in the casting process. The temperature of the melt exiting the furnace during vibration casting is 1380℃, the pouring temperature is 1280℃, the casting frequency during vibration casting is 1800 Hz, and the amplitude is 1.5 mm, so as to obtain an ingot with qualified composition.

[0083] S4, Hot Rolled:

[0084] The ingot obtained in step S3 is placed in a resistance furnace for heating and held at 940°C for 3 hours, and then hot rolled. The initial rolling temperature of the hot rolling is 900°C, the final rolling temperature is 760°C, the total hot rolling rate is 75%, the hollow coiling speed is 1.5 m / min, and the number of hot rolling passes is 7. After hot rolling, the ingot is hollowly coiled to obtain a hot-rolled billet.

[0085] S5, Solid Solution:

[0086] The hot-rolled billet obtained in step S4 is placed in an electric resistance furnace, heated to 980°C, held for 2 hours, and then cooled to room temperature to obtain a solution-treated billet.

[0087] S6, Milling surface:

[0088] After the solution-treated billet obtained in step S5 is uncoiled on an uncoiler, it is milled on both sides using a double-sided milling machine. The thickness of each side is 0.9 mm, the milling cutter speed is 900 r / min, and the feed rate is 1.5 mm / r. The oxide scale on the surface of the hot-rolled billet is removed to obtain the milled billet.

[0089] S7, Preliminary rolling:

[0090] The milled billet obtained in step S7 is subjected to 7 passes of reversible rolling using a four-high reversible primary rolling mill, with an average rolling pressure of 50 N / mm per pass. 2 The cold rolling temperature is 20℃, and the total cold rolling rate is 70%. Cold-rolled sheet and strip are obtained.

[0091] S8, Annealing:

[0092] The cold-rolled strip obtained in step S7 is annealed in a bell jar annealing furnace under atmosphere protection. The atmosphere protection uses argon gas with a purity of 99.6%. The bell jar annealing furnace pressure is 100 kPa. The heating time is 2 hours, the holding temperature is 450℃, and the holding time is 4.5 hours. When the temperature drops to 33℃, the strip is taken out of the furnace to obtain the annealed strip.

[0093] S9, Finished Rolling:

[0094] The annealed strip obtained in step S8 is subjected to 7 passes of reversible rolling using a four-high reversible finishing mill. The cold rolling temperature is 20°C, and the average rolling pressure per pass is 40 N / mm. 2 The total processing rate of cold rolling is 50%, resulting in finished rolled strip;

[0095] S10, Annealing:

[0096] The refined rolled strip obtained in step S9 is subjected to atmosphere-protected annealing in a bell jar annealing furnace. The atmosphere used for protection is argon gas with a purity of 99.6%. The pressure of the bell jar annealing furnace is 100 kPa. The heating time is 1.5 h, the holding temperature is 350 °C, and the holding time is 4.5 h. When the temperature drops to 33 °C, the final product is obtained.

[0097] Example 3:

[0098] like Figure 1 As shown, Figure 1 As shown, a high-strength, high-conductivity copper alloy plate / strip and its preparation method include the following steps:

[0099] S1. Ingredients:

[0100] Prepare nickel plates, zirconium-chromium alloy, rare earth powder, electrolytic copper plates, and Cu-X alloy blocks, and mix the raw materials according to the following mass percentage ratio: Cr: 1.2%, Ni: 1.3%, Zr: 0.2%, X: 0.15%, rare earth: 0.05%, with the balance being Cu; X is one or more elements selected from Si, Fe, Sn, Ag, Ti, Al, and Nb; the mass percentage content of element X in the Cu-X alloy block is 10%, with the balance being Cu; the rare earth powder is one or more elements selected from La, Ce, and Y.

[0101] S2, Smelting:

[0102] The prepared nickel plate, zirconium-chromium alloy, electrolytic copper plate, and Cu-X alloy block are loaded into the furnace and heated to melt at a rate of 12°C / min until they reach 1400°C. After complete melting, a deoxidizer is added, which accounts for 1% of the total mass of the melt. Then rare earth powder is added, and the stirring speed is 60 r / min. After stirring for 30 minutes, the melt is removed from the furnace.

[0103] The deoxidizer is composed of the following components in parts by weight: 3 parts yttrium powder, 2 parts erbium powder, 1 part europium powder, 8 parts Ti, and 10 parts Ni-Mg alloy powder.

[0104] S3, Casting:

[0105] The melt obtained in step S2 is poured into the crystallizer and casting begins. The casting speed is 80 mm / min. Vibration casting is used in the casting process. The melt exit temperature is 1400℃ and the pouring temperature is 1300℃. The casting frequency is 2000 Hz and the amplitude is 2 mm, resulting in an ingot with qualified composition.

[0106] S4, Hot Rolled:

[0107] The ingot obtained in step S3 is placed in a resistance furnace and heated at 930-950℃ for 2-4 hours, and then hot rolled. The initial rolling temperature of the hot rolling is 900℃, the final rolling temperature is 800℃, the total hot rolling rate is 80%, the hollow coiling speed is 2m / min, and the number of hot rolling passes is 7. After hot rolling, the ingot is hollowly coiled to obtain a hot-rolled billet.

[0108] S5, Solid Solution:

[0109] The hot-rolled billet obtained in step S4 is placed in an electric resistance furnace, heated to 980°C, held for 2 hours, and then cooled to room temperature to obtain a solution-treated billet.

[0110] S6, Milling surface:

[0111] After the solution-treated billet obtained in step S5 is uncoiled on an uncoiler, it is milled on both sides using a double-sided milling machine. The thickness of each side is 1.0 mm, the milling cutter speed is 1000 r / min, and the feed rate is 2 mm / r. The oxide scale on the surface of the hot-rolled billet is removed to obtain the milled billet.

[0112] S7, Preliminary rolling:

[0113] The milled billet obtained in step S7 is subjected to 7 passes of reversible rolling using a four-high reversible primary rolling mill, with an average rolling pressure of 50 N / mm per pass. 2 The cold rolling temperature is 35℃, and the total cold rolling rate is 60-80%. Cold-rolled sheet and strip are obtained.

[0114] S8, Annealing:

[0115] The cold-rolled strip obtained in step S7 is annealed in a bell jar annealing furnace under atmosphere protection. The atmosphere protection uses argon gas with a purity of 99.5%. The bell jar annealing furnace pressure is 105 kPa. The heating time is 2 hours, the holding temperature is 500℃, and the holding time is 5 hours. When the temperature drops to 30℃, the strip is taken out of the furnace to obtain the annealed strip.

[0116] S9, Finished Rolling:

[0117] The annealed strip obtained in step S8 is subjected to 7 passes of reversible rolling using a four-high reversible finishing mill. The cold rolling temperature is 35℃, and the average rolling pressure per pass is 40 N / mm. 2 The total processing rate of cold rolling is 60%, resulting in finished rolled strip;

[0118] S10, Annealing:

[0119] The refined rolled strip obtained in step S9 is subjected to atmosphere-protected annealing in a bell jar annealing furnace. The atmosphere used for protection is argon gas with a purity of 99.5%. The pressure of the bell jar annealing furnace is 105 kPa. The heating time is 1.5 h, the holding temperature is 400 °C, and the holding time is 5 h. When the temperature drops to 30 °C, the final product is obtained.

[0120] Table 1 compares the proportions of the high-strength, high-conductivity alloys in Examples 1-4. Table 2 shows the ingot composition of Examples 1-3. Table 3 compares the performance of the alloys prepared in Examples 1-3. As can be seen from Table 3, the alloy prepared in Example 3 has the highest strength and conductivity, which meets the production standards. Therefore, Example 3 is the best example.

[0121] like Figure 2 As shown, Figure 2 The metallographic structure of the alloy plate strip prepared in Example 3 is shown.

[0122] Table 1. Ingredient ratios of high-strength, high-conductivity alloys for Implementations 1 to 3

[0123]

[0124] Table 2 Ingot Composition for Implementations 1 to 3

[0125]

[0126] Table 3 Performance of Finished Products from Implementation 1 to Implementation 3

[0127]

Claims

1. A high-strength, high-conductivity copper alloy plate / strip and its preparation method, characterized in that, Includes the following steps: S1. Ingredients: Prepare nickel plates, zirconium-chromium alloy, rare earth powder, electrolytic copper plates, and Cu-X alloy blocks, and mix the raw materials according to the following mass percentage content: Cr: 0.5-1.2%, Ni: 0.5-1.5%, Zr: 0.05-0.25%, X: 0.05-0.25%, rare earth: 0.05%, with the balance being Cu; X is one or more of the elements Si, Fe, Sn, Ag, Ti, Al, and Nb; S2, Smelting: The prepared nickel plate, zirconium-chromium alloy, electrolytic copper plate, and Cu-X alloy block are loaded into the furnace and heated to melt. After complete melting, a deoxidizer is added, which accounts for 0.5-1% of the total mass of the melt. Then rare earth powder is added. The stirring speed is 50-60 r / min. After stirring continuously for 20-30 minutes, the melt is taken out of the furnace to obtain the melt. S3, Casting: The melt obtained in step S2 is poured into the crystallizer and casting begins. The casting speed is 60-80 mm / min. Vibration casting is used in the casting process to obtain ingots with qualified composition. S4, Hot Rolled: The ingot obtained in step S3 is placed in a resistance furnace and heated at 930-950℃ for 2-4 hours, and then hot rolled. The number of hot rolling passes is 7. After hot rolling, the ingot is hollowly rolled to obtain a hot-rolled billet. S5, Solid Solution: The hot-rolled billet obtained in step S4 is placed in an electric resistance furnace, heated to 980°C, held for 2 hours, and then cooled to room temperature to obtain a solution-treated billet. S6, Milling surface: After the solution-treated billet obtained in step S5 is uncoiled on an uncoiler, it is milled from top to bottom using a double-sided milling machine. The thickness of each milling on one side is 0.5-1.0 mm to remove the oxide scale on the surface of the hot-rolled billet, and the milled billet is obtained. S7, Preliminary rolling: The milled billet obtained in step S7 is subjected to 7 passes of reversible rolling using a four-roll reversible primary rolling mill. The total cold rolling rate is 60-80%, resulting in cold-rolled strip. S8, Annealing: The cold-rolled strip obtained in step S7 is annealed in a bell jar annealing furnace under atmosphere protection. The heating time is 2 hours, the holding temperature is 400-500℃, and the holding time is 4-5 hours. After the temperature drops to below 40℃, the strip is taken out of the furnace to obtain the annealed strip. S9, Finished Rolling: The annealed strip obtained in step S8 is subjected to 7 passes of reversible rolling using a four-roll reversible finishing mill. The total cold rolling rate is 40-60%, resulting in a finished strip. S10, Annealing: The fine-rolled strip obtained in step S9 is annealed in a bell jar annealing furnace under atmosphere protection. The heating time is 1.5 hours, the holding temperature is 300-400℃, and the holding time is 4-5 hours. The strip is removed from the furnace when the temperature drops below 40℃ to obtain the final product. The deoxidizer described in step S2 is composed of the following components in parts by weight: 1-3 parts yttrium powder, 1-2 parts erbium powder, 0.5-1 part europium powder, 7-8 parts Ti, and 5-10 parts Ni-Mg alloy powder; In step S1, the mass percentage content of element X in the Cu-X alloy block is 5-10%, with the balance being Cu; The heating rate in step S2 is 8-12℃ / min, and the temperature is raised to 1350-1400℃; In step S3, the melt temperature during vibration casting is 1350-1400℃, the pouring temperature is 1250-1300℃, the casting frequency during vibration casting is 1500-2000Hz, and the amplitude is 1-2mm. In step S4, the initial rolling temperature of hot rolling is 900℃, the final rolling temperature is 750-900℃, the total hot rolling rate is 70-80%, and the speed of hollow coiling is 1-2m / min.

2. The high-strength, high-conductivity copper alloy plate and strip and its preparation method as described in claim 1, characterized in that, In step S6, the milling cutter speed is 800-1000 r / min, and the feed rate is 1-2 mm / r.

3. The high-strength, high-conductivity copper alloy plate and strip and its preparation method as described in claim 1, characterized in that, The atmosphere protection described in steps S8 and S10 uses argon gas with a purity of ≥99%, and the pressure of the bell annealing furnace is 99-105 kPa.

4. The high-strength, high-conductivity copper alloy plate and strip and its preparation method as described in claim 1, characterized in that, In steps S7 and S9, the cold rolling temperature for the rough rolling and finish rolling is 10-35℃, and the average rolling pressure per pass for the rough rolling is 50 N / mm. 2 The average rolling pressure per pass in the finishing mill is 40 N / mm. 2 .

5. The high-strength, high-conductivity copper alloy plate and strip and its preparation method as described in claim 1, characterized in that, In steps S7 and S9, the cold rolling temperature for the rough rolling and finish rolling is 10-35℃, and the average rolling pressure per pass for the rough rolling is 50 N / mm. 2 .

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