CN113981265A - Copper alloy having excellent hot rolling properties and method for producing same - Google Patents
Copper alloy having excellent hot rolling properties and method for producing same Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/02—Alloys based on copper with tin as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
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Abstract
The invention discloses a copper alloy with excellent hot rolling performance and a manufacturing method thereof, wherein the copper alloy comprises the following components in percentage by weight: ni: 0.6 wt% -1.0 wt%, Sn: 1.0 wt% -2.0 wt%, Mg: 0.01 wt% -0.03 wt%, P: 0.06 wt% -0.10 wt%, O: the alloy is characterized in that the alloy is not more than 0.0010 wt%, the balance of Cu and inevitable impurity alloy is oxygen-free copper as a matrix, the oxygen content is controlled to be not more than 0.0010 wt%, trace element Mg is added, the alloy has excellent hot workability, ingot casting does not crack in the casting and hot rolling processes, the alloy has excellent hot workability, wherein the yield strength Rp of the alloy is not less than 520MPa, the elongation A11.3 is not less than 6%, the conductivity is not less than 38% IACS, the bending workability (GW and BW directions) R/t is not more than 1, the temperature is kept at 150 ℃ for 1000 hours, and the stress residual rate is not less than 85%.
Description
Technical Field
The invention relates to the field of copper alloy manufacturing, in particular to a copper alloy with excellent hot rolling performance and a manufacturing method thereof.
Background
In recent years, electrical and electronic components such as connectors have been increasingly highly integrated, downsized, and lightweight, and accordingly, there has been an increasing demand for thinner copper or copper alloy strip materials as raw materials, and in order to suppress generation of joule heat by current application, electrical and electronic components such as connectors are required to have good conductivity and high strength capable of withstanding stress applied during assembly or operation of the electrical and electronic devices, and further, electrical and electronic components such as connectors are generally formed by bending, and therefore, are required to have excellent bending workability and excellent stress relaxation resistance.
Cu — Ni — Sn alloys are representative copper alloys having both high strength and high conductivity. The copper alloy is improved in strength and conductivity by precipitation of fine particles of a Ni — P intermetallic compound, and is used as a material for lead frames, various terminals of electronic devices, connectors, and the like.
The Chinese patent publication No. CN105316520B discloses a preparation method of Cu-Ni-Sn copper alloy, the yield strength Rp of the Cu-Ni-Sn copper alloy is more than or equal to 520Mpa, the elongation A113 is more than or equal to 6 percent, and the bending processability, the stress relaxation performance and the conductivity are not reflected in the Cu-Ni-Sn copper alloy.
The Chinese patent publication No. CN110144491A discloses a method for preparing an ingot with a Cu-Ni-Sn alloy cast subcutaneous crack, which adopts a vibration casting mode to solve the ingot crack.
The U.S. C19040 copper alloy contains elements such as Ni, Sn, P, etc., which have a large influence on the cracking of the ingot during casting and heating of the ingot. In the casting process, an Ni — P compound formed from Ni and P and Sn are generally crystallized or precipitated at grain boundaries, and the melting point thereof is lower than that of the parent phase Cu, so that the ingot is unevenly solidified, internal deformation occurs, and the ingot is easily cracked by casting stress. In addition, when hot rolling, the ingot is heated at a high temperature, and the casting stress is superimposed by the heating stress, and the ingot is also likely to crack, so that the hot rolling is interrupted.
Disclosure of Invention
The present invention is directed to a copper alloy having excellent hot rolling properties and a method for manufacturing the same, which solve the problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the copper alloy with excellent hot rolling performance comprises Ni, Sn, Mg, P, O and the balance of Cu and inevitable impurities, wherein the Ni, the Sn, the Mg, the P and the O comprise the following components in percentage by weight: ni: 0.6 wt% -1.0 wt%, Sn: 1.0 wt% -2.0 wt%, Mg: 0.01 wt% -0.03 wt%, P: 0.06 wt% -0.10 wt%, O: less than or equal to 0.0010wt percent.
Preferably, the preparation process comprises the following steps: batching → smelting → semicontinuous casting → hot rolling → quenching → milling face → rough rolling → aging treatment → medium rolling → annealing treatment → finish rolling → low temperature annealing, the specific implementation process is as follows:
1) preparing materials: proportioning the components according to requirements;
2) smelting: adding metal Ni, Sn and phosphorus-copper alloy into copper water in sequence, and calcining charcoal to cover 100mm in thickness;
3) semi-continuous casting, wherein the casting temperature is 1160-1220 ℃, and the casting speed is 2-5 m/h;
4) hot rolling: the alloy is hot rolled, cogging temperature is carried out, the heat preservation time is 3-6 h, the alloy rolling processing rate is controlled to be more than 85%, and then finish rolling is carried out;
5) quenching: rapidly quenching the strip blank after hot rolling, wherein the temperature of the strip blank after quenching is lower than 400 ℃;
6) milling a surface: removing oxides on the surface of the strip, and milling the upper surface and the lower surface by 0.5-1.0 mm respectively;
7) rough rolling: adopting a four-roller roughing mill;
8) aging treatment: the aging temperature is controlled to be 400-550 ℃, and the heat preservation time is controlled to be 5-12 h;
9) intermediate rolling: a four-roller middle rolling mill is adopted, and the processing rate is controlled to be 50-80%;
10) annealing treatment: a continuous annealing furnace is adopted;
11) finish rolling: the processing rate is controlled to be 20-60%;
12) low-temperature annealing: a continuous annealing furnace is adopted;
13) and cleaning, slitting and packaging the obtained product.
Preferably, the O in the copper water is controlled to be less than or equal to 0.0010 wt%.
Preferably, the total processing rate of the four-roller roughing mill in the roughing process is controlled to be 50-80%.
Preferably, in the step 2), the smelting temperature is 1100-1250 ℃.
Preferably, in the step 4), the cogging temperature is controlled to be 800-1000 ℃, and the finishing temperature is 700-900 ℃.
Preferably, in the step 10), the annealing temperature is controlled to be 500-800 ℃, the annealing time is 20-60 s, and the grain size of the strip is controlled to be 5-12 um.
Preferably, in the step 12), the temperature is controlled to be 300-400 ℃, and the annealing time is 20-60 s.
The invention has the beneficial effects that:
the alloy of the invention takes oxygen-free copper as a matrix, the oxygen content is controlled to be less than or equal to 0.0010 wt%, if the oxygen content exceeds 0.0010 wt%, the oxygen and nickel, tin and magnesium elements can form NiO, SnO and MgO inclusions, the material performance is reduced, such as bending processing performance, electric conductivity and stress relaxation performance, the yield strength Rp is more than or equal to 520MPa, the elongation A11.3 is more than or equal to 6%, the electric conductivity is more than or equal to 38% IACS, the bending processing performance (GW and BW directions) R/t is less than or equal to 1, the temperature is kept at 150 ℃ for 1000 hours, and the stress residual rate is more than or equal to 85%.
The alloy of the invention is added with Ni element, Ni has the effect of improving the solid solution strengthening effect and the stress relaxation resistance of the copper alloy strip, and particularly, Ni and P form a compound and are precipitated, thereby improving the conductivity, improving the strength and being beneficial to improving the heat resistance, the yield strength and the stress relaxation performance. Therefore, on the premise of ensuring the comprehensive performance of the alloy, the invention controls the content of the Ni element to be 0.6 wt% -1.0 wt%.
The alloy of the invention is added with Sn element, Sn has very strong solid solution strengthening effect, the radius difference between tin atom and copper atom is larger, a small amount of Sn element is added into the copper alloy, which can cause larger lattice distortion, effectively obstruct the movement of dislocation, effectively drag dislocation, improve the strength, softening resistance and stress relaxation performance of the copper alloy, simultaneously reduce the electric conductivity and easily cause the problem of strip billet cracking during hot rolling, serious dendrite segregation and Sn inverse segregation exist in the smelting and casting process, Mg really has the effect of inhibiting Sn from excessively segregating on the grain boundary to be larger, thereby inhibiting the cracking during hot rolling, therefore, the content of Sn element is controlled to be 1.0 wt% -2.0 wt%.
The alloy of the present invention is added with Mg element, Mg being a key element, and Mg is generally considered to be added with the effect of improving stress relaxation resistance and removing S (sulfur), Mg is effective in alleviating Sn segregation to suppress cracking of a strip in hot rolling, Mg forms fibrous precipitates of Ni-P-Mg with Ni and P, and can obtain higher strength and heat resistance than Ni-P precipitates to avoid hot rolling cracking caused by Ni-P precipitates, however, Mg is an element which is easily oxidized to easily cause generation of magnesium oxide in an ingot, and causes defects such as cracking and peeling of the strip in a subsequent process, and when Mg is added to the alloy, the concentration of O (oxygen) must be reduced to 10ppm or less, because the concentration of O (oxygen) is higher than 10ppm, Mg becomes an oxide to deteriorate bending workability and stress relaxation performance of the material, and defects such as stain or coating porosity are generated when an electroplated product is heated, namely Mg oxidation, the addition of Mg not only has no effect but also has negative influence on the processability and the performance, the content of Mg element is controlled to be 0.01-0.03 wt%, and the Mg element is not sensitive to the hot rolling temperature as long as being controlled in the component range, so that the processing is easy in the whole hot rolling temperature range.
The alloy of the present invention is added with a P element for forming P-containing precipitates, wherein the P element is used for forming P-containing precipitates, the P-containing precipitates are uniformly and finely dispersed in a matrix to inhibit the movement of dislocations and improve the strength, conductivity and stress relaxation properties, and the P content of the P-containing precipitates is controlled to be in the above-mentioned predetermined range to thereby improve the bendability by refining crystal grains through the formation of phosphide and the bendability improving effect is exerted by the fact that the P content is too small and insufficient, the effects and effects are not effectively exerted, and when the P content is too large, the particles precipitated from an intermetallic compound Ni-P, Ni-P-Mg are coarsened to thereby reduce the strength, bendability and stress relaxation resistance properties and cause cracking of a strip during hot rolling, which makes the production difficult, and the content of the P element is controlled to be in the range of 0.06 wt% to 0.10 wt%.
The alloy of the present invention has excellent hot workability, excellent strength and electrical conductivity, and also has good bending workability and stress relaxation property, and is suitable as a copper alloy for electronic materials such as terminals and connectors.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The copper alloy with excellent hot rolling performance comprises Ni, Sn, Mg, P, O and the balance of Cu and inevitable impurities, wherein the Ni, the Sn, the Mg, the P and the O comprise the following components in percentage by weight: ni: 0.73 wt%, Sn: 1.23 wt%, Mg: 0.013 wt%, P: 0.07 wt%, O: 0.0010 wt%.
Preferably, the preparation process comprises the following steps: batching → smelting → semicontinuous casting → hot rolling → quenching → milling face → rough rolling → aging treatment → medium rolling → annealing treatment → finish rolling → low temperature annealing, the specific implementation process is as follows:
1) preparing materials: the components are mixed according to the requirements.
2) Smelting: like adding metal Ni, Sn and phosphorus-copper alloy into molten copper in sequence, the smelting temperature is 1100-1250 ℃, and the cover thickness of calcined charcoal is 100 mm.
3) Semi-continuous casting at 1160-1220 ℃ and at a casting speed of 2-5 m/h.
4) Hot rolling: the hot rolling cogging temperature of the alloy is controlled to be 800-1000 ℃, the heat preservation time is 3-6 h, the alloy rolling processing rate is controlled to be more than 85 percent, and the finishing temperature is 700-900 ℃.
5) Quenching: and (3) rapidly quenching the strip blank after hot rolling, wherein the temperature of the strip blank after quenching is lower than 400 ℃.
6) Milling a surface: removing oxides on the surface of the strip, and milling the upper surface and the lower surface by 0.5 mm-1.0 mm respectively.
7) Rough rolling: a four high roughing mill is used.
8) Aging treatment: the aging temperature is controlled to be 400-550 ℃, and the heat preservation time is controlled to be 5-12 h.
9) Intermediate rolling: and a four-roller middle rolling mill is adopted, and the processing rate is controlled to be 50-80%.
10) Annealing treatment: and a continuous annealing furnace is adopted, the annealing temperature is controlled to be 500-800 ℃, and the annealing time is 20-60 s. Controlling the grain size of the strip to be 5-12 um.
11) Finish rolling: the processing rate is controlled to be 20-60%.
12) Low-temperature annealing: adopting a continuous annealing furnace, controlling the temperature at 300-400 ℃, and the annealing time at 20-60 s
13) And cleaning, slitting and packaging the obtained product.
The O content in the copper water is controlled to be less than or equal to 0.0010wt percent.
And controlling the total processing rate of the four-roller roughing mill in the roughing process to be 50-80%.
Example (b): copper alloy compositions shown in Table 1 in the compositions of examples were cast by semi-continuous casting at 1160-1220 ℃ to produce ingots with a gauge of 230mm 640 mm. The ingot was kept at 960 ℃ for 5 hours, and then hot rolled to a thickness of 14.5 mm. The thickness of the strip reaches 13.5mm after the upper surface and the lower surface of the strip blank are respectively milled for 0.5 mm; then, the strip was rolled to a thickness of 2mm by a roughing mill; and then heating the strip to 480 ℃, preserving heat for 8h for aging treatment, carrying out medium rolling to 0.8mm, carrying out heat treatment for 30s in a continuous annealing furnace at the temperature of 600 ℃, then carrying out finish rolling to 0.25mm, and then carrying out medium-low annealing in the continuous annealing furnace at the temperature of 350 ℃ to obtain a finished strip with the thickness of 0.25 mm.
For the strip samples of 5 example alloys prepared, hot workability was examined, and mechanical properties, electric conductivity, stress relaxation resistance, and bending properties were measured, respectively.
Tensile test at room temperature according to GB/T228.1-2010 Metal Material tensile test part 1: room temperature test method was performed on an electronic universal mechanical property tester using a tape head specimen having a width of 12.5mm and a drawing speed of 5 mm/min.
Conductivity testing according to GB/T3048.2-2007 test method for electric properties of wires and cables part 2: resistivity test of metal material, the tester is ZFD microcomputer bridge DC resistance tester, sample width is 20mm, length is 500 mm.
The stress relaxation resistance test is as per JCBAT 309: 2004 copper and copper alloy thin plate strip bending stress relaxation test method, sampling along the direction parallel to the rolling direction, the width of the sample is 10mm, the length is 100mm, the initial loading stress value is 80% of 0.2% yield strength, the test temperature is 150 ℃, and the time is 1000 h.
The bending property test was performed on a bending tester according to GBT232-2010 metal material bending test method, the sample width was 5mm, the length was 50mm, 90-degree bending was performed using a jig with an R of 0.25mm, and the bent portion was evaluated by an optical microscope. The occurrence of cracks was marked as x, the occurrence of wrinkles was marked as Δ, and good results were marked as o.
Example 2
This example is substantially the same as the method of example 1 provided, with the main differences being: the contents of Ni, Sn, Mg, P and O are different, wherein the ratio of Ni: 0.85 wt%, Sn: 1.52 wt%, Mg: 0.020 wt%, P: 0.08 wt%, O: 0.0007 wt%.
Example 3
This example is substantially the same as the method of example 1 provided, with the main differences being: different contents of Ni, Sn, Mg, P and O, wherein Ni: 0.88 wt%, Sn: 1.61 wt%, Mg: 0.016 wt%, P: 0.09 wt%, O: 0.0005 wt%.
Example 4
This example is substantially the same as the method of example 1 provided, with the main differences being: the contents of Ni, Sn, Mg, P and O are different, wherein the ratio of Ni: 0.80 wt%, Sn: 1.47 wt%, Mg: 0.019 wt%, P: 0.07 wt%, O: 0.0006 wt%.
Example 5
This example is substantially the same as the method of example 1 provided, with the main differences being: the contents of Ni, Sn, Mg, P and O are different, wherein the ratio of Ni: 0.77 wt%, Sn: 1.39 wt%, Mg: 0.012 wt%, P: 0.08 wt%, O: 0.0007 wt%.
The ingredients and performance results for each example are shown in table 1:
according to the embodiment, the copper alloy in the embodiment of the invention realizes the yield strength Rp of more than or equal to 520MPa, the elongation A11.3 of more than or equal to 6 percent, the electric conductivity of more than or equal to 38 percent IACS, the bending processing performance (GW and BW directions) R/t of less than or equal to 1, the heat preservation at 150 ℃ for 1000 hours, and the stress residual rate of more than or equal to 85 percent.
The alloy has excellent stress relaxation performance, has high strength, high conductivity and excellent bending processability, is widely applied to connectors, terminals or switch parts of electric, automobile, communication devices and the like, Ni element is added, the solid solution strengthening effect and the stress relaxation resistance of a copper alloy strip can be improved, the addition of Sn element can improve the strength, softening resistance and stress relaxation resistance of the copper alloy, and Mg element can effectively relax the segregation of Sn, thereby inhibiting the cracking of the strip in hot rolling, adding P element and improving the bending processability.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The copper alloy with excellent hot rolling performance is characterized by comprising Ni, Sn, Mg, P and O, and the balance of Cu and inevitable impurities, wherein the Ni, Sn, Mg, P and O comprise the following components in percentage by weight: ni: 0.6 wt% -1.0 wt%, Sn: 1.0 wt% -2.0 wt%, Mg: 0.01 wt% -0.03 wt%, P: 0.06 wt% -0.10 wt%, O: less than or equal to 0.0010wt percent.
2. The method for producing a copper alloy excellent in hot rolling property according to claim 1, characterized in that the production process comprises the steps of: batching → smelting → semicontinuous casting → hot rolling → quenching → milling face → rough rolling → aging treatment → medium rolling → annealing treatment → finish rolling → low temperature annealing, the specific implementation process is as follows:
1) preparing materials: proportioning the components according to requirements;
2) smelting: adding metal Ni, Sn and phosphorus-copper alloy into copper water in sequence, and calcining charcoal to cover 100mm in thickness;
3) semi-continuous casting, wherein the casting temperature is 1160-1220 ℃, and the casting speed is 2-5 m/h;
4) hot rolling: the alloy is hot rolled, cogging temperature is carried out, the heat preservation time is 3-6 h, the alloy rolling processing rate is controlled to be more than 85%, and then finish rolling is carried out;
5) quenching: rapidly quenching the strip blank after hot rolling, wherein the temperature of the strip blank after quenching is lower than 400 ℃;
6) milling a surface: removing oxides on the surface of the strip, and milling the upper surface and the lower surface by 0.5-1.0 mm respectively;
7) rough rolling: adopting a four-roller roughing mill;
8) aging treatment: the aging temperature is controlled to be 400-550 ℃, and the heat preservation time is controlled to be 5-12 h;
9) intermediate rolling: a four-roller middle rolling mill is adopted, and the processing rate is controlled to be 50-80%;
10) annealing treatment: a continuous annealing furnace is adopted;
11) finish rolling: the processing rate is controlled to be 20-60%;
12) low-temperature annealing: a continuous annealing furnace is adopted;
13) and cleaning, slitting and packaging the obtained product.
3. The method of producing a copper alloy excellent in hot rolling property according to claim 2, wherein O in the molten copper is controlled to 0.0010 wt% or less.
4. The method of manufacturing a copper alloy excellent in hot rolling property according to claim 2, wherein a total reduction ratio of the four-high roughing mill in the rough rolling is controlled to 50 to 80%.
5. The method of manufacturing a copper alloy excellent in hot rolling property according to claim 2, wherein in the step 2), the melting temperature is 1100 ℃ to 1250 ℃.
6. The method of producing a copper alloy having excellent hot rolling properties according to claim 2, wherein the cogging temperature is controlled to 800 to 1000 ℃ and the finishing temperature is controlled to 700 to 900 ℃ in the step 4).
7. The method of manufacturing a copper alloy having excellent hot rolling properties according to claim 2, wherein in the step 10), the annealing temperature is controlled to 500 ℃ to 800 ℃, the annealing time is controlled to 20 to 60 seconds, and the grain size of the strip is controlled to 5 to 12 μm.
8. The method of manufacturing a copper alloy having excellent hot rolling properties according to claim 2, wherein the temperature in the step 12) is controlled to 300 to 400 ℃ and the annealing time is controlled to 20 to 60 seconds.
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| CN103088229A (en) * | 2012-11-06 | 2013-05-08 | 北京有色金属研究总院 | Low-cost copper alloy for socket connectors and processing method thereof |
| CN109022900A (en) * | 2018-08-17 | 2018-12-18 | 宁波博威合金材料股份有限公司 | A kind of copper alloy of excellent combination property and its application |
| CN109609801A (en) * | 2018-12-06 | 2019-04-12 | 宁波博威合金材料股份有限公司 | High property copper alloy and preparation method thereof |
| CN110643850A (en) * | 2019-10-24 | 2020-01-03 | 宁波博威合金材料股份有限公司 | Copper alloy with excellent bending performance and preparation method and application thereof |
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