1a60 high-strength and high-conductivity electrical round aluminum rod and preparation method and application thereof

Abstract

This invention discloses a high-strength and high-conductivity 1A60 electrical round aluminum rod, its preparation method, and its application. Belonging to the field of metal heat treatment technology, the invention involves sequentially hot-rolling, cold-rolling, and annealing 1A60 electrical round aluminum rods to obtain the high-strength and high-conductivity 1A60 electrical round aluminum rod. The invention also discloses the high-strength and high-conductivity 1A60 electrical round aluminum rod prepared by the above method, and its application in wires and cables. This invention achieves an optimized ratio of dislocation density and grain size in the 1A60 electrical round aluminum rod through a combination of hot rolling, cold rolling, and annealing, thereby preparing a high-strength and high-conductivity 1A60 electrical round aluminum rod. The process of this invention is simple and convenient to operate, making it suitable for large-scale production.

Description

Technical Field

[0001] This invention belongs to the field of metal heat treatment technology, and particularly relates to a 1A60 electrical round aluminum rod with high strength and high conductivity, its preparation method and application. Background Technology

[0002] Aluminum and aluminum alloys are essential raw materials for national economic construction, strategic emerging industries, and national defense science and technology. Aluminum, with its lightweight, corrosion resistance, and excellent electrical conductivity, is widely used in the wire and cable industry; currently, 95% of industrial wires and cables are made of aluminum and aluminum alloys. With the vigorous construction of ultra-high voltage power grids, long-distance power transmission networks, and new energy power sources, as well as the rapid development of the communications industry, the demand for aluminum and aluminum alloy materials is extremely high.

[0003] As a raw material for wires and cables, the production of electrical round aluminum rods has also ushered in a broad market prospect. High-strength, high-conductivity electrical round aluminum rods are necessary conditions to ensure the safety and reliability of wires and cables during service and to reduce energy consumption. Currently, the power industry requires electrical round aluminum rods to have a tensile strength greater than 120MPa, an elongation greater than 6%, and a conductivity greater than 63%. The strength, elongation, and resistivity of 1A60 electrical round aluminum rods depend on their microstructure, such as dislocation density and grain size. Higher dislocation density and smaller grain size result in higher strength; however, higher dislocation density leads to lower elongation and conductivity. Therefore, the strength, elongation, and resistivity of electrical round aluminum rods are contradictory; it is difficult to simultaneously achieve optimal strength, elongation, and conductivity.

[0004] Currently, 1A60 electrical round aluminum rods are mainly manufactured through hot rolling. The existing processing methods yield 1A60 electrical round aluminum rods with a strength of 100-120 MPa, an elongation of approximately 6%, and a conductivity of less than 62.5%. Furthermore, the performance of each batch of products is inconsistent. This makes it difficult to meet the high-performance requirements of the power industry for electrical round aluminum rods.

[0005] Therefore, how to develop an advanced processing method to provide an electrical round aluminum rod with both high strength and conductivity is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes a 1A60 electrical round aluminum rod with high strength and high conductivity, its preparation method, and its application.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for preparing a 1A60 electrical round aluminum rod with high strength and high conductivity involves sequentially hot rolling, cold rolling, and annealing of a 1A60 electrical round aluminum rod to obtain the 1A60 electrical round aluminum rod with high strength and high conductivity.

[0009] Preferably, the hot rolling temperature is 450°C and the hot rolling is performed 4 times.

[0010] Preferably, the first hot rolling is performed by holding the material in a muffle furnace for 15 minutes before rolling, and after each rolling pass, the material is quickly placed in a muffle furnace for 5 minutes.

[0011] The insulation temperature is 450℃.

[0012] Preferably, during the hot rolling process, the deformation amount in the first pass is 28% of the original cross-sectional area of ​​the bar, the deformation amount in the second pass is 19% of the original cross-sectional area of ​​the bar, the deformation amount in the third pass is 16% of the original cross-sectional area of ​​the bar, and the deformation amount in the fourth pass is 13% of the original cross-sectional area of ​​the bar.

[0013] Preferably, the cold rolling temperature is room temperature, and the number of times is 2.

[0014] In the cold rolling process, the deformation amount in the first pass is 11% of the original cross-sectional area of ​​the bar, and the deformation amount in the second pass is 5% of the original cross-sectional area of ​​the bar.

[0015] Preferably, the annealing temperature is 300°C and the time is 10-15 minutes.

[0016] A 1A60 electrical round aluminum rod with high strength and high conductivity, prepared by the above-described method.

[0017] Application of a high-strength and high-conductivity 1A60 electrical round aluminum rod in wires and cables.

[0018] This invention discloses a high-strength and high-conductivity 1A60 electrical round aluminum rod, its preparation method, and its applications. The invention utilizes a combination of hot rolling, cold rolling, and annealing to optimize the dislocation density and grain size ratio in the 1A60 electrical round aluminum rod, thereby producing a high-strength and high-conductivity 1A60 electrical round aluminum rod. The process of this invention is simple and convenient to operate, making it suitable for large-scale production. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1The graph shows the conductivity, tensile strength, and elongation of the 1A60 electrical round aluminum rod obtained in Embodiment 1 of the present invention.

[0021] Figure 2 The graph shows the conductivity, tensile strength, and elongation of the 1A60 electrical round aluminum rod obtained in Embodiment 2 of the present invention.

[0022] Figure 3 The graph shows the conductivity, tensile strength, and elongation of the 1A60 electrical round aluminum rod obtained in Comparative Example 1 of this invention.

[0023] Figure 4 The graph shows the conductivity, tensile strength, and elongation of the 1A60 electrical round aluminum rod obtained in Comparative Example 2 of this invention.

[0024] Figure 5 The graph shows the conductivity, tensile strength, and elongation of the 1A60 electrical round aluminum rod obtained in Comparative Example 3 of this invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] This invention discloses a method for preparing a 1A60 electrical round aluminum rod with high strength and high conductivity. The 1A60 electrical round aluminum rod is subjected to hot rolling, cold rolling and annealing treatment in sequence to obtain the 1A60 electrical round aluminum rod with high strength and high conductivity.

[0028] In one embodiment, the hot rolling temperature is 450°C, and the hot rolling is performed four times. Temperatures higher than this can easily lead to coarse grains and reduced performance, while temperatures lower than this can result in higher dislocation density and lower conductivity.

[0029] In one embodiment, the first hot rolling is performed by holding the material in a muffle furnace for 15 minutes before rolling, and after each rolling pass, the material is quickly placed in a muffle furnace for 5 minutes.

[0030] The insulation temperature is 450℃.

[0031] The heat preservation process can eliminate the work hardening produced in the previous process in the aluminum material;

[0032] In one embodiment, during the hot rolling process, the deformation amount in the first pass is 28% of the original cross-sectional area of ​​the bar, the deformation amount in the second pass is 19% of the original cross-sectional area of ​​the bar, the deformation amount in the third pass is 16% of the original cross-sectional area of ​​the bar, and the deformation amount in the fourth pass is 13% of the original cross-sectional area of ​​the bar.

[0033] The hot rolling process described above enables the aluminum material to undergo dynamic recrystallization, refining the grain size.

[0034] In one embodiment, the cold rolling temperature is room temperature, and the number of times is 2.

[0035] In the cold rolling process, the deformation amount in the first pass is 11% of the original cross-sectional area of ​​the bar, and the deformation amount in the second pass is 5% of the original cross-sectional area of ​​the bar.

[0036] The aforementioned cold rolling process can increase the dislocation density in aluminum materials.

[0037] In one embodiment, the annealing temperature is 300°C and the time is 10-15 minutes.

[0038] Under the above annealing conditions, hot-rolled aluminum alloys undergo dynamic recovery, eliminating a certain number of dislocations and improving the elongation and conductivity of the alloy, while the strength decreases slightly. The final annealed aluminum alloy has a conductivity of 63.24-63.41%, a tensile strength of 128-130 MPa, and an elongation of 7.6-9.2%.

[0039] This invention also discloses a 1A60 electrical round aluminum rod with high strength and high conductivity, prepared by the above-described method.

[0040] This invention also discloses the application of a 1A60 electrical round aluminum rod with high strength and high conductivity in wires and cables.

[0041] The 1A60 electrical round aluminum rod used in this invention was provided by a certain company. The company's product has a strength of 100-110MPa, a resistivity of 27.5-27.8nΩ·m, and an elongation of more than 6%.

[0042] Example 1

[0043] A method for preparing a 1A60 electrical round aluminum rod with high strength and high conductivity includes the following steps:

[0044] (1) Hot rolling: 1A60 electrical round aluminum rod with a thickness of 33mm was placed in a muffle furnace at 450℃ and held for 15min. Then, the surface of the rolling mill rolls was coated with lubricating oil, the rolling mill was started, and the rolling mill speed was set to 0.5m / min. After the rolling mill rotated evenly, the 1A60 electrical round aluminum rod was taken out of the muffle furnace and subjected to multiple hot rolling passes. During the hot rolling process, the deformation amount of the first pass was 28% of the original cross-sectional area of ​​the rod, the deformation amount of the second pass was 19% of the original cross-sectional area of ​​the rod, the deformation amount of the third pass was 16% of the original cross-sectional area of ​​the rod, and the deformation amount of the fourth pass was 13% of the original cross-sectional area of ​​the rod. After each pass of rolling was completed, the hot-rolled sample was quickly placed in a muffle furnace and held at 450℃ for 5min. After the holding time was completed, the hot-rolled 1A60 electrical round aluminum rod was obtained.

[0045] (2) Cold rolling: The 1A60 electrical round aluminum rod obtained in step (1) is subjected to multiple cold rolling at room temperature. The deformation amount of the first pass is 11% of the original cross-sectional area of ​​the rod, and the deformation amount of the second pass is 5% of the original cross-sectional area of ​​the rod. After cold rolling, a 1A60 electrical round aluminum rod product with a diameter of 9.5mm is obtained.

[0046] (3) Annealing treatment: Heat the muffle furnace to 300°C, and then put the cold-rolled 1A60 electrical round aluminum rod product obtained in step (2) into the muffle furnace and keep it at 300°C for 15 minutes. Then air cool it to room temperature to obtain a 1A60 electrical round aluminum rod with high strength and high conductivity.

[0047] Example 2

[0048] A method for preparing a 1A60 electrical round aluminum rod with high strength and high conductivity, which differs from Example 1 in that the heat preservation time during the annealing process in step (3) is 10 min.

[0049] Comparative Example 1

[0050] A method for preparing a 1A60 electrical round aluminum rod, which is prepared by cold rolling, specifically includes the following steps:

[0051] Lubricating oil was applied to the surface of the rolling mill rolls. The rolling mill was started, and the roll speed was set to 0.5 m / min. After the rolls rotated evenly, the deformation amount of the first pass was 28% of the original cross-sectional area of ​​the bar, the deformation amount of the second pass was 19% of the original cross-sectional area of ​​the bar, the deformation amount of the third pass was 16% of the original cross-sectional area of ​​the bar, the deformation amount of the fourth pass was 13% of the original cross-sectional area of ​​the bar, the deformation amount of the fifth pass was 11% of the original cross-sectional area of ​​the bar, and the deformation amount of the sixth pass was 5% of the original cross-sectional area of ​​the bar. The total deformation amount of the 1A60 electrical round aluminum rod after rolling was 92% of the original cross-sectional area.

[0052] Comparative Example 2

[0053] A method for preparing a 1A60 electrical round aluminum rod, which is prepared by hot rolling, specifically includes the following steps:

[0054] After heating the muffle furnace to 450℃, a 33mm thick 1A60 electrical round aluminum rod is placed in the 450℃ muffle furnace and held for 15 minutes. Lubricating oil is applied to the surface of the rolling mill rolls, and the mill is started. The roll speed is set to 0.5m / min. After the rolls rotate evenly, the 1A60 electrical round aluminum rod is removed from the muffle furnace. The deformation amount in the first pass is 28% of the original cross-sectional area of ​​the rod; the deformation amount in the second pass is 19%; the deformation amount in the third pass is 16%; the deformation amount in the fourth pass is 13%; the deformation amount in the fifth pass is 11%; and the deformation amount in the sixth pass is 5%. After rolling, the total deformation amount of the 1A60 electrical round aluminum rod is 92% of its original cross-sectional area, resulting in a 9.5mm diameter 1A60 electrical round aluminum rod. After each rolling pass, the rolled sample is quickly placed in a muffle furnace and held at 450°C for 5 minutes. After the holding time is completed, the next rolling deformation pass is carried out.

[0055] Comparative Example 3

[0056] A method for preparing a 1A60 electrical round aluminum rod differs from Example 1 in that the annealing treatment in step (3) is not included, while the other steps and parameters are the same as in Example 1.

[0057] Technical effects:

[0058] The tensile strength, elongation, and conductivity of the 1A60 electrical round aluminum rods obtained in Examples 1-2 and Comparative Examples 1-3 are shown in the figures below. Figure 1-3As shown, the tensile strength, elongation, and conductivity of the 1A60 electrical round aluminum rod obtained in Example 1 are 128 MPa, 9.2%, and 63.41% IACS, respectively; the tensile strength, elongation, and conductivity of the 1A60 electrical round aluminum rod obtained in Example 2 are 130 MPa, 7.6%, and 63.24% IACS, respectively; the tensile strength, elongation, and conductivity of the 1A60 electrical round aluminum rod obtained in Comparative Example 1 are 146 MPa, 4.2%, and 61.2% IACS, respectively; the tensile strength, elongation, and conductivity of the 1A60 electrical round aluminum rod obtained in Comparative Example 2 are 103 MPa, 11.3%, and 64.59% IACS, respectively; and the tensile strength, elongation, and conductivity of the 1A60 electrical round aluminum rod obtained in Comparative Example 3 are 139 MPa, 5.2%, and 62.37% IACS, respectively. The 1A60 electrical round aluminum rods obtained in Examples 1-2 can meet the requirements for electrical round aluminum rods (tensile strength above 120MPa, elongation not less than 6%, conductivity (20℃) greater than 63% IACS), while Comparative Examples 1-3 cannot meet the requirements.

[0059] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for preparing a 1A60 electrical round aluminum rod with high strength and high conductivity, characterized in that, The 1A60 electrical round aluminum rod is obtained by sequentially hot rolling, cold rolling and annealing. The hot rolling temperature is 450℃, and the hot rolling is performed 4 times; Before the first hot rolling, the furnace is held in the heat for 15 minutes. After each rolling pass, the furnace is quickly placed in the heat for 5 minutes. The insulation temperature is 450℃; During the hot rolling process, the deformation amount in the first pass is 28% of the original cross-sectional area of ​​the bar, the deformation amount in the second pass is 19% of the original cross-sectional area of ​​the bar, the deformation amount in the third pass is 16% of the original cross-sectional area of ​​the bar, and the deformation amount in the fourth pass is 13% of the original cross-sectional area of ​​the bar. The cold rolling temperature is room temperature, and the number of times is 2. In the cold rolling process, the deformation amount in the first pass is 11% of the original cross-sectional area of ​​the bar, and the deformation amount in the second pass is 5% of the original cross-sectional area of ​​the bar. The annealing temperature is 300℃ and the time is 10-15 min.

2. The 1A60 electrical round aluminum rod with high strength and high conductivity prepared by the preparation method described in claim 1.

3. The application of the 1A60 electrical round aluminum rod with high strength and high conductivity as described in claim 2 in wires and cables.

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