A beryllium-free low-copper high-strength copper alloy and a method for manufacturing the same

Abstract

The present application relates to a kind of beryllium-free low copper high-strength copper alloy and its preparation method, the copper alloy contains the following mass percentage of component: Ni is 21.5-23%, Mn is 22.5-24%, rare earth metal is 0.2-0.5%, Al is 0.6-1.0%, Ti is 0.4-0.6%, impurity content≤0.2%, the balance is copper, the rare earth metal includes one or both of lanthanum and cerium;Preparation method includes: batching preparation, smelting, casting or ingot, homogenization annealing and final heat treatment.The copper alloy material prepared by the present application can reach 550MPa in as-cast tensile strength, and elongation is greater than 12%;After final heat treatment, the mechanical properties of copper alloy are equivalent to beryllium bronze: tensile strength≥1000MPa, elongation≥5%, elastic modulus>120GPa, hardness HB≥300.

Description

Technical Field

[0001] This invention relates to the field of intrinsically safe materials and explosion-proof tools, and in particular to a beryllium-free, low-copper, high-strength copper alloy and its preparation method. Background Technology

[0002] Beryllium bronze is a type of tin bronze with beryllium as its main alloying element. It possesses high hardness, elastic limit, fatigue limit, and wear resistance, as well as good corrosion resistance, thermal conductivity, and electrical conductivity. It does not produce sparks upon impact and is widely used as an important elastic element, wear-resistant part, and safety tool. Beryllium bronze is a typical copper alloy used in safety tools and is an intrinsically safe material.

[0003] There are two ranges for beryllium content in cast beryllium bronze: one is a low beryllium range of 0.5-1.0%, and the other is a high beryllium content range of 1.6-2.1%, with the main grade being QBe2.0. Its strength can reach 1170 MPa, hardness 360 HBW, but elongation is only 1-2%. Beryllium in beryllium bronze is a rare and precious metal, and beryllium and its compounds, whether inhaled as dust, fumes, or vapors, can cause diseases of the upper respiratory tract and lungs. Studies have shown that when the beryllium content in the air exceeds 25 μg / m³... 3 Or living in an environment with a beryllium content exceeding 0.01 μg / m³ for an extended period of time. 3 In environments where beryllium oxide is present, it can cause acute beryllium poisoning (beryllium lung), and long-term inhalation of low concentrations of beryllium oxide can also cause chronic beryllium disease. Therefore, beryllium has been repeatedly identified as one of the hazardous trace elements of great concern internationally.

[0004] In existing technologies, beryllium-free copper alloys mainly include five series: Cu-Ni-Sn, Cu-Ni-Mn, Cu-Ni-Si, Cu-Ni-Al, and Cu-Ti. The strength and fatigue resistance of Cu-Ni-Si and Cu-Ni-Al-Si series alloys still need further improvement. Among the Cu-Ti series alloys, the Japanese NGK copper-titanium alloy with a titanium content of 3.5% can achieve a strength of 1100 MPa, a yield strength of 1050 MPa, a hardness of 360 MPa, and an elongation of up to 7.7%. This is currently the best beryllium-free high-strength copper alloy, but due to the easy oxidation of titanium, its preparation is difficult and must be carried out using vacuum melting. Among the Cu-Ni-Mn series alloys, Jiangsu University reported that the Cu-5.6Ni-2.5Mn beryllium-free high-strength copper alloy has an elastic modulus of 115 GPa, an elastic limit of 554 MPa, a hardness of less than 240 HBW, a maximum tensile strength of only 702 MPa, and an elongation of 5.6%, which is far inferior to beryllium bronze. Pan Qihan's high-nickel manganese alloy Cu-20Ni-20Mn, when rolled into thin sheets (1 mm thick) with large plastic deformation, has a strength σb ≥ 1470 MPa, an elastic modulus E ≥ 153 GPa, and a hardness HV ≥ 450. However, it cannot be used to prepare high-strength irregularly shaped parts under casting, conventional forging, and rolling conditions. Xi'an University of Technology has disclosed a copper-nickel-manganese-iron alloy, which is composed of the following components by mass percentage: Ni 19%-21%, Mn 20%-22%, Fe 4%-5%, Ti 0%-1.5%, with the balance being Cu. It is prepared by powder metallurgy and mainly solves the problems of coarse and uneven dendrites, non-dense microstructure, and compositional segregation in the as-cast microstructure of copper-nickel-manganese-iron alloy. However, it cannot solve the problem of normal operation under high-temperature working environment without microstructural transformation. Summary of the Invention

[0005] The purpose of this invention is to provide a beryllium-free, low-copper, high-strength copper alloy and its preparation method, so as to eliminate the hazards of beryllium in beryllium bronze used for safety tools, while ensuring excellent intrinsic safety properties and high strength performance.

[0006] The specific technical solution of the present invention, a beryllium-free, low-copper, high-strength copper alloy and its preparation method, is as follows:

[0007] A beryllium-free, low-copper, high-strength copper alloy, comprising the following components by mass percentage: Ni 21.5-23%, Mn 22.5-24%, rare earth metals 0.2-0.5%, Al 0.6-1.0%, Ti 0.4-0.6%, impurity content ≤0.2%, and the balance being copper, wherein the rare earth metals include one or both of lanthanum and cerium.

[0008] Preferably, the as-cast properties of the copper alloy are: tensile strength ≥ 550 MPa, elongation > 12%; and mechanical properties after final heat treatment are: tensile strength ≥ 1000 MPa, elongation ≥ 5%, elastic modulus 120 GPa, and hardness HB ≥ 300.

[0009] This invention also provides a method for preparing a beryllium-free, low-copper, high-strength copper alloy, comprising the following steps:

[0010] S101. Ingredient Preparation

[0011] The raw materials and auxiliary materials are prepared according to the composition ratio of the copper alloy. The raw materials include electrolytic copper, electrolytic manganese and electrolytic nickel, and the auxiliary materials are electrolytic aluminum, sponge titanium and copper-rare earth master alloy. The copper-rare earth master alloy is one of copper-lanthanum, copper-cerium or copper-lanthanum-cerium alloy.

[0012] S201, Melting

[0013] The prepared raw materials and auxiliary materials are put into the medium frequency induction furnace for melting to obtain a liquid alloy with uniform chemical composition. The melting temperature is 1250-1350℃.

[0014] S301, casting or ingot casting

[0015] The molten alloy is poured into a ladle, allowed to stand to remove slag, and then poured into a mold to obtain a copper alloy casting; or poured into an ingot mold to obtain a copper alloy ingot; or poured into a crystallizer to obtain a copper alloy rod. The casting temperature is 1100-1200℃.

[0016] S401, Homogenization Annealing

[0017] The castings, ingots or rods are held at 650-800℃ for 3-6 hours and then cooled to room temperature to homogenize the components of the copper alloy.

[0018] S501, Final Heat Treatment

[0019] Heat the casting, ingot, or rod to 600-680℃ and hold for 30-60 minutes. Then air-cool or water-cool to room temperature. Reheat to 360-490℃ and hold for 15-20 hours before air-cooling to room temperature.

[0020] Preferably, step S302 is included after step S301, in which the copper alloy ingot is cooled and then forged by heating it to 800-850℃ to form a forging.

[0021] Preferably, the forging method includes hot forging, free forging, or die forging.

[0022] Preferably, step S402 is included after step S401, in which the copper alloy casting rod is hot-extruded or rolled, heated to 800-850°C for hot extrusion or rolling into profiles or pipes, and then cooled to room temperature.

[0023] Preferably, the hot extrusion includes forward extrusion and reverse extrusion; the rolling includes longitudinal rolling, transverse rolling and skew rolling.

[0024] Preferably, step S402 is followed by step S403, in which the profile or pipe is subjected to solution treatment and cold working, heated to 600°C and held for 60 minutes, then cooled to room temperature by water, and cold working is performed to obtain the irregular part.

[0025] Preferably, the cold working includes cold bending, cold stamping, and bulging.

[0026] Preferably, the prepared copper alloy has a tensile strength ≥1000MPa, an elongation ≥5%, an elastic modulus of 120GPa, and a hardness HB ≥300.

[0027] The beryllium-free, low-copper, high-strength copper alloy and its preparation method of the present invention have the following advantages:

[0028] 1. The copper alloy material prepared by this invention has a cast tensile strength of over 550 MPa and an elongation of over 12%. After final heat treatment, the mechanical properties of the copper alloy are comparable to those of beryllium bronze: tensile strength ≥1000 MPa, elongation ≥5%, elastic modulus >120 GPa, hardness HB ≥300, tensile fracture is ductile fracture, microstructure is fine, and average grain size is 20-60 μm.

[0029] 2. The beryllium-free, low-copper, high-strength copper alloy of this invention does not produce sparks during friction and impact, making it an intrinsically safe copper alloy; its copper content is less than 57%, which can be used to manufacture tools and instruments that can be safely used in acetylene environments.

[0030] 3. The beryllium-free, low-copper, high-strength copper alloy of this invention can be cast into various castings, forged into forgings, hot-extruded and rolled into various profiles, or the profiles can be solution-treated and then cold-deformed to obtain various irregular parts.

[0031] 4. The material cost of the beryllium-free, low-copper, high-strength copper alloy of this invention is only about 40% of the cost of beryllium bronze, while its mechanical properties are comparable to those of beryllium bronze. Attached Figure Description

[0032] Figure 1 Scanning electron microscope images of the tensile fracture surface of the copper alloy prepared for this invention;

[0033] Figure 2 The image shows the microstructure of the copper alloy prepared according to this invention.

[0034] Figure 3 This is a flowchart illustrating the preparation process of the copper alloy casting in Embodiment 1 of the present invention;

[0035] Figure 4 This is a flowchart illustrating the preparation process of the copper alloy forging in Embodiment 2 of the present invention.

[0036] Figure 5 This is a flowchart illustrating the preparation process of the copper alloy profile in Embodiment 3 of the present invention.

[0037] Figure 6 This is a flowchart illustrating the preparation process of the copper alloy irregular part in Embodiment 4 of the present invention. Detailed Implementation

[0038] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0039] Example 1

[0040] This embodiment prepared a 1000 kg beryllium-free, low-copper, high-strength copper alloy casting and provided a method for preparing the casting, such as... Figure 3 As shown, it includes the following steps:

[0041] S101. Ingredient Preparation

[0042] Prepare 480 kg of electrolytic copper, 230 kg of electrolytic manganese and 220 kg of electrolytic nickel for melting, and 60 kg of copper-lanthanum master alloy, 8 kg of electrolytic aluminum and 5 kg of sponge titanium as auxiliary materials. The weight percentage of lanthanum in the copper-lanthanum master alloy is 5%.

[0043] S201, Melting

[0044] Electrolytic copper, electrolytic manganese, and electrolytic nickel, along with auxiliary materials electrolytic aluminum and sponge titanium, are added to a medium-frequency induction furnace for melting to form a raw material alloy liquid. Then, a copper-lanthanum master alloy is wrapped in electrolytic copper sheet and pressed into the raw material alloy liquid for melting again, resulting in a copper alloy liquid with uniform chemical composition. The melting temperature is 1300℃.

[0045] S301, Casting

[0046] The molten copper alloy is poured into a ladle, allowed to stand to remove slag, and then poured into a mold at a casting temperature of 1200℃ to obtain a copper alloy casting.

[0047] S401, Homogenization Annealing

[0048] After cooling, the mixture was kept at 750℃ for 5 hours to homogenize it, eliminate segregation, homogenize the composition, and then cooled to room temperature.

[0049] S501, Heat Treatment

[0050] The final heat treatment is carried out by heating: the solution treatment process is to hold at 650℃ for 40 minutes, then water cool to room temperature, then reheat to 400℃ and hold for 18 hours, and then air cool.

[0051] The beryllium-free, low-copper, high-strength copper alloy casting prepared in this embodiment does not produce sparks during friction and impact, exhibiting intrinsic safety properties. The chemical elemental composition and weight percentage of the copper alloy are: Ni 22%, Mn 23%, lanthanum 0.3%, Al 0.8%, Ti 0.5%, impurity content ≤0.2%, and the balance being copper. Tensile tests were performed on samples cut from the casting; the tensile strength was 1050 MPa; the elongation was 6%; the elastic modulus was 125 GPa; and the hardness (HB) was 310.

[0052] Example 2

[0053] This embodiment prepared a 1000 kg beryllium-free, low-copper, high-strength copper alloy forging and provided a method for preparing its casting forging, such as... Figure 4 As shown, it includes the following steps:

[0054] S101. Ingredient Preparation

[0055] Prepare 467 kg of electrolytic copper, 225 kg of electrolytic manganese and 215 kg of electrolytic nickel for melting, and 80 kg of copper-cerium master alloy, 10 kg of electrolytic aluminum and 6 kg of sponge titanium as auxiliary materials. The weight percentage of cerium in the copper-cerium master alloy is 5%.

[0056] S201, Melting

[0057] Electrolytic copper, electrolytic manganese, and electrolytic nickel, along with auxiliary electrolytic aluminum and sponge titanium, are fed into a medium-frequency induction furnace for melting to form a raw material alloy liquid. Then, a copper-cerium intermediate alloy is wrapped in electrolytic copper foil and pressed into the raw material alloy liquid for melting again, resulting in a copper alloy liquid with uniform chemical composition. The melting temperature is 1290℃.

[0058] S301, Ingot

[0059] The molten copper alloy is poured into a ladle, allowed to stand to remove slag, and then poured into an ingot mold at a casting temperature of 1150℃ to obtain a copper alloy ingot.

[0060] S302, Forging

[0061] After the ingot cools, it is reheated to 800℃ and forged into a forging. Forging methods include hot forging, free forging, and die forging.

[0062] S401, Homogenization Annealing

[0063] After cooling, the mixture was kept at 650℃ for 5 hours for homogenization to eliminate segregation and homogenize the composition, and then cooled to room temperature.

[0064] S501, Final Heat Treatment

[0065] Final heat treatment: Heat to 680℃ and hold for 30 minutes, cool to room temperature with water, reheat to 490℃ and hold for 15 hours, then air cool.

[0066] The beryllium-free, low-copper, high-strength copper alloy forging prepared in this embodiment does not produce sparks during friction and impact, exhibiting intrinsic safety properties. The chemical elemental composition and weight percentage of the copper alloy are: Ni 21.5%, Mn 22.5%, Cerium 0.4%; Al 1.0%, Ti 0.6%, impurity content ≤0.2%, balance being copper. Tensile tests were performed on samples cut from the casting; the tensile strength was 1080 MPa; the elongation was 8%; the elastic modulus was 123 GPa; and the hardness (HB) was 315.

[0067] Example 3

[0068] This embodiment casts 1000 kg of beryllium-free, low-copper, high-strength copper alloy profiles and provides a method for preparing such profiles, such as... Figure 5 As shown, it includes the following steps:

[0069] S101. Ingredient Preparation

[0070] The raw materials for melting are 417 kg of electrolytic copper, 240 kg of electrolytic manganese and 230 kg of electrolytic nickel, and auxiliary materials are 100 kg of copper-lanthanum-cerium alloy, 10 kg of electrolytic aluminum and 6 kg of sponge titanium. The weight percentages of lanthanum and cerium in the copper-lanthanum-cerium alloy are 2% and 3%, respectively.

[0071] S201, Melting

[0072] Electrolytic copper, electrolytic manganese, and electrolytic nickel, along with auxiliary electrolytic aluminum and sponge titanium, are added to a medium-frequency induction furnace for melting to form a raw material alloy liquid. Then, a copper-lanthanum-cerium intermediate alloy is wrapped in electrolytic copper sheet and pressed into the raw material alloy liquid for melting again, resulting in a copper alloy liquid with uniform chemical composition. The melting temperature is 1350℃.

[0073] S301, Ingot

[0074] The molten copper alloy is poured into a crystallizer mold at a casting temperature of 1200℃ to obtain a copper alloy casting rod.

[0075] S401, Homogenization Annealing

[0076] After cooling, the casting rod is cut and kept at 800℃ for 5 hours for homogenization treatment to eliminate segregation and homogenize the composition. Then it is cooled to room temperature.

[0077] S402, hot extrusion or rolling

[0078] After cooling to room temperature, it is heated to 850℃ for hot extrusion into pipes, and then cooled to room temperature again.

[0079] S501, Final Heat Treatment

[0080] Final heat treatment: Heat to 600℃ and hold for 60 minutes, cool to room temperature with water, reheat to 360℃ and hold for 18 hours, then air cool.

[0081] The beryllium-free, low-copper, high-strength copper alloy profile prepared in this embodiment does not produce sparks during friction and impact, exhibiting intrinsic safety properties. The chemical elemental composition and weight percentage of the copper alloy are: Ni 23%, Mn 24%, Cerium 0.3%, Lanthanum 0.2%, Al 1.0%, Ti 0.6%, impurity content ≤0.2%, with the balance being copper. Tensile testing was performed on samples cut from the tube; the tensile strength was 1200 MPa; the elongation was 8.5%; the elastic modulus was 135 GPa; and the hardness (HB) was 360.

[0082] Example 4

[0083] This embodiment prepared 1000 kg of beryllium-free, low-copper, high-strength copper alloy and provided a method for preparing its stamped irregular parts, such as... Figure 6 As shown, it includes the following steps:

[0084] S101. Ingredient Preparation

[0085] The raw materials prepared for melting include 510 kg of electrolytic copper, 225 kg of electrolytic manganese, and 215 kg of electrolytic nickel. Auxiliary materials include 40 kg of copper-lanthanum alloy, 8 kg of electrolytic aluminum, and 5 kg of sponge titanium. The copper-lanthanum alloy contains 5% lanthanum by weight.

[0086] S201, Melting

[0087] Electrolytic copper, electrolytic manganese, and electrolytic nickel, along with auxiliary electrolytic aluminum and sponge titanium, are added to a medium-frequency induction furnace for melting to form a raw material alloy liquid. Then, a copper-lanthanum master alloy is wrapped in electrolytic copper sheet and pressed into the raw material alloy liquid for melting again, resulting in a copper alloy liquid with uniform chemical composition. The melting temperature is 1250℃.

[0088] S301, Ingot

[0089] The molten copper alloy is poured into a crystallizer mold at a casting temperature of 1100℃ to obtain a copper alloy casting rod.

[0090] S401, Homogenization Annealing

[0091] After cooling, the casting rod is cut and kept at 700℃ for 4 hours for homogenization treatment to eliminate segregation and homogenize the composition, and then cooled to room temperature.

[0092] S402, hot extrusion or rolling

[0093] After cooling to room temperature, the material is reheated to 700°C for hot extrusion into profiles or pipes.

[0094] S403, solution treatment and cold working

[0095] Profiles or pipes are solution treated, heated to 600℃ and held for 60 minutes, then cooled to room temperature by water, and then cold-bent, expanded or stamped to obtain irregular shapes.

[0096] S501, Final Heat Treatment

[0097] Final heat treatment: Heat to 600℃ and hold for 60 minutes, cool to room temperature with water, reheat to 360℃ and hold for 18 hours, then air cool.

[0098] The beryllium-free, low-copper, high-strength copper alloy prepared in this embodiment does not produce sparks during friction and impact, exhibiting intrinsically safe properties. The chemical elemental composition and weight percentage of this copper alloy are: Ni 21.5%, Mn 22.5%, lanthanum 0.2%, Al 0.8%, Ti 0.4%, impurity content ≤0.2%, with the balance being copper. Tensile tests were performed on samples cut from irregularly shaped parts, revealing a tensile strength of 1120 MPa, elongation at 8%, elastic modulus of 125 GPa, and hardness HB of 355.

[0099] Comparative Example 1

[0100] Compared with Example 1, this comparative example does not add copper-lanthanum master alloy, but uses electrolytic copper instead of copper-lanthanum master alloy, while the other raw materials and preparation process remain the same as in Example 1.

[0101] The chemical element composition and weight percentage of this copper alloy are as follows: Ni 22%, Mn 23%, Al 0.8%, Ti 0.5%, impurity content ≤0.2%, and the balance is copper. Tensile tests were performed on samples cut from the casting. The tensile strength was 850 MPa; the elongation was 4%; the elastic modulus was 118 GPa; and the hardness (HB) was 295.

[0102] Comparative Example 2

[0103] Compared with Example 1, this comparative example added 20 kg of copper-lanthanum master alloy and 520 kg of electrolytic copper, while the remaining raw materials and preparation process remained the same as in Example 1.

[0104] The chemical element composition and weight percentage of this alloy are as follows: Ni 22%, Mn 23%, lanthanum 0.1%, Al 0.8%, Ti 0.5%, impurity content ≤0.2%, and the balance being copper. Tensile tests were conducted on samples cut from the casting. The tensile strength was 910 MPa; the elongation was 4.5%; the elastic modulus was 120 GPa; and the hardness (HB) was 298. This comparison shows that due to the excessively low lanthanum content, the purification and refining effects are insufficient, resulting in lower performance.

[0105] Comparative Example 3

[0106] Compared with Example 1, this comparative example added 120 kg of copper-lanthanum master alloy and 420 kg of electrolytic copper, while the remaining raw materials and preparation process remained the same as in Example 1.

[0107] The chemical element composition and weight percentage of this alloy are as follows: Ni 22%, Mn 23%, lanthanum 0.6%, Al 0.8%, Ti 0.5%, impurity content ≤0.2%, and the balance is copper. Tensile tests were performed on samples cut from the casting. The tensile strength was 980 MPa; the elongation was 5%; the elastic modulus was 120 GPa; and the hardness (HB) was 298. This comparison shows that due to the excessively high lanthanum content, inclusions formed in the copper alloy resulted in uneven distribution of metallic elements, thus reducing the performance of the copper alloy.

[0108] The copper alloy material prepared by this invention has a cast tensile strength of over 550 MPa and an elongation of over 12%. After final heat treatment, the mechanical properties of the copper alloy are comparable to those of beryllium bronze: tensile strength ≥1000 MPa, elongation ≥5%, elastic modulus >120 GPa, and hardness HB ≥300.

[0109] like Figure 1 The image shown is a scanning electron microscope image of the tensile fracture surface of the copper alloy prepared in this invention. It can be seen that there are a large number of dimples in the tensile fracture surface, which is judged to be a ductile fracture surface.

[0110] like Figure 2 The image shown is a microstructure photograph of the copper alloy prepared according to the present invention. The microstructure is fine and dense, with small visible grain size, and the average grain size is 20-60 μm.

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A beryllium-free, low-copper, high-strength copper alloy, characterized in that, The copper alloy contains the following components by mass percentage: Ni 21.5-23%, Mn 22.5-24%, rare earth metals 0.2-0.5%, Al 0.6-1.0%, Ti 0.4-0.6%, impurity content ≤0.2%, and the balance being copper. The rare earth metals are one or both of lanthanum and cerium. As-cast properties of copper alloy: tensile strength ≥ 550 MPa, elongation > 12%; mechanical properties after final heat treatment: tensile strength ≥ 1000 MPa, elongation ≥ 5%, elastic modulus 120 GPa; hardness HB ≥ 300; A method for preparing beryllium-free, low-copper, high-strength copper alloys includes the following steps: S101. Ingredient Preparation The raw materials and auxiliary materials are prepared according to the composition ratio of the copper alloy. The raw materials include electrolytic copper, electrolytic manganese and electrolytic nickel, and the auxiliary materials are electrolytic aluminum, sponge titanium and copper-rare earth alloy. The copper-rare earth master alloy is one of copper-lanthanum, copper-cerium or copper-lanthanum-cerium master alloy. S201, Melting The prepared raw materials and auxiliary materials are put into the medium frequency induction furnace for melting to obtain a liquid alloy with uniform chemical composition. The melting temperature is 1250-1350℃. S301, casting or ingot casting The molten alloy is poured into a ladle, allowed to stand to remove slag, and then poured into a mold to obtain a copper alloy casting; or poured into an ingot mold to obtain a copper alloy ingot; or poured into a crystallizer to obtain a copper alloy rod. The casting temperature is 1100~1200℃. S401, Homogenization Annealing The castings, ingots or rods are held at 650-800℃ for 3-6 hours and then cooled to room temperature to homogenize the components of the copper alloy. S501, Final Heat Treatment Heat the casting, ingot or rod to 600-680℃ and hold for 30-60 minutes, then air cool or water cool to room temperature. Reheat to 360-490℃ and hold for 15-20 hours, then air cool to room temperature. The beryllium-free, low-copper, high-strength copper alloy is used to manufacture explosion-proof safety tools.

2. The beryllium-free, low-copper, high-strength copper alloy according to claim 1, characterized in that, Step S301 is followed by step S302, where the copper alloy ingot is cooled and then forged by heating it to 800-850℃ to form a forging.

3. The beryllium-free, low-copper, high-strength copper alloy according to claim 2, characterized in that, Forging methods include hot forging, free forging, or die forging.

4. The beryllium-free, low-copper, high-strength copper alloy according to claim 1, characterized in that, Step S401 is followed by step S402, in which the copper alloy casting rod is hot-extruded or rolled, heated to 800-850℃ to be hot-extruded or rolled into profiles or pipes, and then cooled to room temperature.

5. The beryllium-free, low-copper, high-strength copper alloy according to claim 4, characterized in that, Hot extrusion includes forward extrusion and reverse extrusion; rolling includes longitudinal rolling, transverse rolling and skew rolling.

6. The beryllium-free, low-copper, high-strength copper alloy according to claim 4, characterized in that, Step S402 is followed by step S403, which involves solution treatment and cold working of the profile or pipe, heating to 600°C and holding for 60 minutes, water cooling to room temperature, and cold working to obtain the irregular part.

7. The beryllium-free, low-copper, high-strength copper alloy according to claim 6, characterized in that, Cold working includes cold bending, cold stamping, and bulging.

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