CN108754248B - Aluminum alloy conductor for overhead stranded wire and manufacturing method thereof - Google Patents
Aluminum alloy conductor for overhead stranded wire and manufacturing method thereof Download PDFInfo
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Abstract
An aluminum alloy conductor for an overhead strand and a manufacturing method thereof, the aluminum alloy conductor contains elements Mg, Si, La, Ce, Cr, V, Ti and B, and the balance of Al and inevitable impurities, and the manufacturing method comprises the following steps: smelting and preparing aluminum alloy liquid, blowing and refining in a furnace, refining on-line crystal grains, on-line degassing and filtering, high-energy ultrasonic stirring, constant-temperature continuous casting and rolling, on-line quenching, torque-free drawing and artificial aging. According to the invention, the cleanliness and the conductivity of the aluminum alloy wire are improved by optimizing the addition amount and the purification process of the lanthanum-cerium mixed rare earth, the component uniformity of the aluminum alloy wire is improved by high-energy ultrasonic stirring, the stability of the initial rolling, final rolling and quenching temperatures of a casting blank is improved by constant-temperature continuous casting and continuous rolling, and the strength and the uniformity of the aluminum alloy wire are improved. The aluminum alloy conductor has the advantages of high strength, high conductivity and good consistency, is suitable for manufacturing aluminum alloy core aluminum stranded wires and all-aluminum alloy stranded wires, and reduces the electric energy loss of the power transmission line.
Description
Technical Field
The invention belongs to the technical field of aluminum alloy conductor manufacturing, and particularly relates to an aluminum alloy conductor for an overhead stranded wire and a manufacturing method thereof.
Background
With the rapid development of national economy and the continuous improvement of the living standard of people in China, the demand on electric power is rapidly increased, and long-distance and large-span transmission lines are increasingly developed towards ultrahigh voltage and high capacity. However, the existing overhead stranded wire of the long-distance large-span power transmission line in China is mainly the steel-cored aluminum stranded wire processed by twisting a steel wire with an aluminum conductor, and the power transmission power loss of the steel-cored aluminum stranded wire is large, so that the power utilization rate is low. In order to reduce the electric energy loss of long-distance large-span transmission lines and improve the electric energy utilization efficiency, the development of high-strength and high-conductivity aluminum alloy wires to manufacture overhead stranded wires of all-aluminum alloy wires is urgently needed.
The Al-Mg-Si alloy is a heat-treatment-strengthened wrought aluminum alloy and is a main material for manufacturing an aluminum alloy conductor for an overhead stranded wire in China at present. The strength of the Al-Mg-Si series aluminum alloy conductor for the existing overhead stranded wire in China is usually less than 330MPa, and the electric conductivity is usually lower than 53 percent IACS. The manufacturing difficulty of the Al-Mg-Si series aluminum alloy wire is high because the strength of the aluminum alloy wire is improved along with the increase of the contents of the strengthening elements Mg and Si, but the electric conductivity of the aluminum alloy wire is gradually reduced, so that the strength and the electric conductivity of the aluminum alloy wire are difficult to be improved simultaneously. In addition, the existing Al-Mg-Si series aluminum alloy wire has large strength and conductivity fluctuation along the length direction, namely the stability and consistency of the strength and the conductivity along the length direction are poor, and the requirement of the existing long-distance large-span power transmission line on the all-aluminum alloy overhead stranded wire in China is difficult to meet. Therefore, the existing aluminum alloy conductor for the overhead stranded wire and the manufacturing method thereof still need to be improved and developed.
Disclosure of Invention
The invention aims to provide an aluminum alloy conductor for an overhead stranded wire, which has high strength, high conductivity and good uniformity and consistency, and a manufacturing method thereof, aiming at the problems and the defects.
The technical scheme of the invention is realized as follows:
the invention relates to an aluminum alloy conductor for an overhead stranded wire, which is characterized by comprising the following components in percentage by mass: 1.2-1.4% of Mg1.6-1.8% of Si, 0.08-0.12% of La, 0.02-0.03% of Ce, 0.02-0.04% of Cr, 0.01-0.02% of V, 0.005-0.01% of Ti, 0.0005-0.001% of B, less than or equal to 0.15% of Fe, and the balance of Al and inevitable other impurities, wherein the mass ratio of La to Ce is 4:1, the mass ratio of Cr to V is 2:1, the mass ratio of Ti to B is 10:1, the single content of other impurities is less than or equal to 0.01%, and the total content of other impurities is less than or equal to 0.05%.
The invention relates to a manufacturing method of an aluminum alloy conductor for an overhead stranded wire, which is characterized by comprising the following steps of:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
the second step is that: heating and melting an aluminum ingot at 760-780 ℃, adding a magnesium ingot accounting for 1.2-1.4% of the total weight of the raw materials, 8-9% of Al-20Si alloy, 0.1-0.2% of Al-20Cr alloy, 0.1-0.2% of Al-10V alloy and 0.1-0.15% of lanthanum-cerium mixed rare earth, and stirring and melting to obtain aluminum alloy liquid;
the third step: blowing and refining the aluminum alloy liquid for 10-20 minutes by using argon with the purity of 99.99% and a refining agent accounting for 0.5-1% of the total weight of the raw materials, degassing and removing impurities, slagging off, and then standing for 30-60 minutes;
the fourth step: introducing the aluminum alloy liquid into a launder, and adding Al-5Ti-0.5B alloy rods accounting for 0.1-0.2% of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degassing machine graphite rotor with the rotation speed of 150-200 revolutions per minute, the argon purity of 99.99 percent and the argon flow of 1-2 cubic meters per hour and a ceramic filter plate with the porosity of 50-60 ppi on a launder to carry out online degassing and filtering treatment;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of the continuous casting machine is 17-18 m/min, the ultrasonic output frequency is 10-15 kHz, and the ultrasonic output power is 800-1000W, and cooling the aluminum alloy round rod to the room temperature through water for online quenching;
the seventh step: drawing an aluminum alloy round rod into an aluminum alloy wire with the diameter of 1-5 mm in a torque-free manner under the conditions that the pass drawing deformation is 1-2% and the drawing speed is 9-12 m/s;
eighth step: aging the aluminum alloy wire at 130-140 ℃ for 2-3 hours, then continuously heating to 160-170 ℃ for aging for 5-6 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
Compared with the prior art, the invention has the following advantages:
the invention improves the cleanliness and the organization component uniformity of the aluminum alloy conductor by optimizing the component composition and the manufacturing process of the aluminum alloy conductor, solves the problem that the strength and the conductivity of the aluminum alloy conductor are difficult to be improved simultaneously in the prior art, ensures that the tensile strength of the aluminum alloy conductor is more than 330MPa, the elongation after fracture is more than 4.5 percent, and the conductivity is more than 53 percent IACS, has the advantages of high strength, high conductivity and good uniformity and consistency, is suitable for manufacturing an overhead all-aluminum alloy stranded wire for a long-distance and large-span power transmission line, and has very important significance for reducing the electric energy loss of the power transmission line and improving the electric energy utilization rate.
The invention will be further described with reference to the accompanying drawings.
Drawings
Fig. 1 is a manufacturing flow chart of the aluminum alloy conductor for the overhead stranded wire according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is described in further detail below.
The aluminum alloy conductor for the overhead stranded wire comprises the following components in percentage by mass: 1.2-1.4% of Mg, 1.6-1.8% of Si, 0.08-0.12% of La, 0.02-0.03% of Ce, 0.02-0.04% of Cr, 0.01-0.02% of V, 0.005-0.01% of Ti, 0.0005-0.001% of B, less than or equal to 0.15% of Fe, and the balance of Al and inevitable other impurities, wherein the mass ratio of La to Ce is 4:1, the mass ratio of Cr to V is 2:1, the mass ratio of Ti to B is 10:1, the single content of other impurities is less than or equal to 0.01%, and the total content of other impurities is less than or equal to 0.05%.
Mg and Si can form Mg in the aging treatment process of the aluminum alloy conductor2The Si strengthening phase strengthens the strength of the aluminum alloy wire, the higher the contents of Mg and Si are, the higher the strength of the aluminum alloy wire is, but the conductivity of the aluminum alloy wire is gradually reduced. The inventors of the present application have gone over largeAfter experimental study, the strength of the aluminum alloy wire cannot reach more than 330MPa when the Mg content is less than 1.2% or the Si content is less than 1.6%, and the conductivity of the aluminum alloy wire cannot reach more than 53% IACS when the Mg content is more than 1.4% or the Si content is more than 1.8%. Therefore, in order to ensure that the aluminum alloy wire obtains enough strength and conductivity, the content of Mg is selected to be 1.2-1.4%, and the content of Si is selected to be 1.6-1.8%.
La and Ce are rare earth elements frequently added to the existing aluminum alloy wire, have the cleaning effect on the aluminum alloy wire, can eliminate the negative influence of metal impurity elements on the strength and the electric conductivity of the aluminum alloy wire, and improve the strength and the electric conductivity of the aluminum alloy wire. However, the addition amounts of the La and Ce rare earth elements in the prior art, particularly the mass ratio of the La to Ce rare earth elements, are lack of intensive research, so that the addition amounts of the La and Ce rare earth elements are relatively random, and no accurate optimized value exists. After a large amount of research experiments, the inventor of the application finds that when the added La and Ce are in a mass ratio of 4:1, the La content is 0.08-0.12% and the Ce content is 0.02-0.03%, the added La and Ce rare earth elements can eliminate the negative influence of nonmetallic inclusions such as H, O, Na and K on the strength and the electric conductivity of the aluminum alloy wire to the maximum extent, and further the strength and the electric conductivity of the aluminum alloy wire are remarkably improved.
The main function of Cr and V is to refine the modified Fe-rich phase. Fe is an inevitable impurity element in an aluminum ingot, and is generally distributed in an aluminum alloy matrix in the form of a coarse acicular Fe-rich phase in the aluminum alloy conductor, and the coarse acicular Fe-rich phase can seriously crack the aluminum alloy matrix, so that the strength and the plasticity of the aluminum alloy conductor are reduced. After a large number of experimental studies, the inventors of the present application found that addition of Cr or V alone has an inhibitory effect on the growth of the coarse acicular Fe-rich phase, but neither of them can completely eliminate the coarse acicular Fe-rich phase. When 0.02-0.04% of Cr and 0.01-0.02% of V are added in a compounding manner, and the mass ratio of Cr to V is 2:1, the Fe-rich phase is refined and modified through the interaction of Cr and V, the growth of the Fe-rich phase in a needle shape can be completely inhibited, the Fe-rich phase is changed into fine uniform particles from a coarse needle shape, the influence of the strength and plasticity of the Fe-rich phase on the aluminum alloy wire can be eliminated, and the strength and plasticity of the aluminum alloy wire can be obviously improved.
The Ti and the B are added into the aluminum alloy conductor in the form of an Al-5Ti-0.5B alloy rod, and mainly have the effects of refining grains of the aluminum alloy conductor, improving the uniformity of structural components of the aluminum alloy conductor and further improving the strength, the plasticity, the stability and the consistency of the strength and the electric conductivity of the aluminum alloy conductor. After a great deal of detailed experimental research, the inventor of the present application found that, for the Al-Mg-Si-based aluminum alloy wire of the present invention, the Al-5Ti-0.5B alloy rod has a stronger grain refining capability than the conventional Al-5Ti-1B alloy rod or Al-5Ti-1C alloy rod, and by adding 0.1 to 0.2% of the Al-5Ti-0.5B alloy rod and including 0.005 to 0.01% of Ti and 0.0005 to 0.001% of B to the aluminum alloy wire, the grains of the aluminum alloy wire can be significantly refined, the structural uniformity of the aluminum alloy wire can be improved, and the strength and plasticity of the aluminum alloy wire can be improved.
Referring to fig. 1, the method for manufacturing an aluminum alloy conductor for an overhead stranded wire according to the present invention includes the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
fe is an inevitable impurity element in the aluminum ingot, and not only can reduce the strength of the aluminum alloy wire, but also can reduce the conductivity of the aluminum alloy wire. According to the invention, an Al 99.85-grade remelting aluminum ingot is used as a main raw material, the content of an impurity element Fe is controlled to be less than or equal to 0.15%, the content of other impurities is controlled to be less than or equal to 0.01%, and the total amount of other impurities is controlled to be less than or equal to 0.05%, so that the aluminum alloy wire is ensured to obtain high strength and high conductivity.
The second step is that: heating and melting an aluminum ingot in a heating furnace at 760-780 ℃, adding a magnesium ingot accounting for 1.2-1.4% of the total weight of raw materials, 8-9% of Al-20Si alloy, 0.1-0.2% of Al-20Cr alloy, 0.1-0.2% of Al-10V alloy and 0.1-0.15% of lanthanum-cerium mixed rare earth, and stirring and melting to obtain aluminum alloy liquid;
the third step: blowing and refining the aluminum alloy liquid in the furnace for 10-20 minutes by using argon with the purity of 99.99% and a refining agent accounting for 0.5-1% of the total weight of the raw materials, degassing and removing impurities, slagging off, and then standing for 30-60 minutes;
the fourth step: introducing the aluminum alloy liquid in the furnace into a launder, and adding an Al-5Ti-0.5B alloy rod accounting for 0.1-0.2% of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degassing machine graphite rotor with the rotation speed of 150-200 revolutions per minute, the argon purity of 99.99 percent and the argon flow of 1-2 cubic meters per hour and a ceramic filter plate with the porosity of 50-60 ppi on a launder to carry out online degassing and filtering treatment;
the defects of air holes, impurities and the like can not only reduce the strength of the aluminum alloy wire, but also reduce the conductivity of the aluminum alloy wire. In order to improve the cleanliness of the aluminum alloy wire, argon with the purity of 99.99 percent and a refining agent accounting for 0.5-1 percent of the total weight of raw materials are firstly adopted to carry out blowing refining on aluminum alloy liquid in a furnace for 10-20 minutes to carry out degassing and impurity removing treatment, the aluminum alloy liquid sequentially flows through a degassing machine graphite rotor with the rotation speed of 150-200 revolutions per minute, the argon purity of 99.99 percent and the argon flow rate of 1-2 cubic meters per hour and a ceramic filter plate with the porosity of 50-60 ppi to carry out online degassing and filtering treatment, finally, the gas content of the aluminum alloy wire is lower than 0.12 ml/100 g of aluminum, the PoDFA value of the content of non-metal impurities is lower than 0.06 square millimeter/kilogram of aluminum, the cleanliness of the aluminum alloy wire is greatly improved, and the strength and the conductivity of the aluminum alloy wire.
And a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of the continuous casting machine is 17-18 m/min, the ultrasonic output frequency is 10-15 kHz, and the ultrasonic output power is 800-1000W, and cooling the aluminum alloy round rod to the room temperature through water for online quenching;
the uneven structure composition not only reduces the strength and plasticity of the aluminum alloy wire, but also causes the strength and conductivity of the aluminum alloy wire to fluctuate greatly along the length direction, i.e. the strength and conductivity have poor stability and consistency along the length direction. In order to improve the component uniformity of the aluminum alloy wire, the invention adopts high-energy ultrasonic vibration to stir the aluminum alloy on the basis of carrying out online grain refinement treatment on the aluminum alloy liquid, thereby further improving the component uniformity of the aluminum alloy liquid.
The inventor of the application finds that the intensity and the conductivity of the aluminum alloy wire along the length direction fluctuate greatly after deep system research on the continuous casting and rolling process parameters, and another important influencing factor with poor stability and consistency is the continuous casting temperature of the aluminum alloy liquid, because the continuous casting temperature of the aluminum alloy liquid fluctuates, the solidification behavior of the aluminum alloy liquid is influenced, and finally the internal structure form of the aluminum alloy round rod changes. In addition, the continuous casting temperature of the aluminum alloy liquid fluctuates to influence the initial rolling temperature and the final rolling temperature of the subsequent aluminum alloy round rod to fluctuate, and finally the internal structure form of the aluminum alloy round rod fluctuates, so that the intensity and the conductivity of the aluminum alloy wire along the length direction fluctuate greatly. Therefore, in order to reduce the fluctuation of the strength and the conductivity of the aluminum alloy wire along the length direction caused by the fluctuation of the temperature of the aluminum alloy liquid, the continuous casting temperature of the aluminum alloy liquid is seriously controlled to be 690 ℃. Under the conditions that the temperature of aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of a continuous casting machine is 17-18 m/min, the ultrasonic output frequency is 10-15 kHz, and the ultrasonic output power is 800-1000W, the aluminum alloy liquid is continuously cast and rolled into an aluminum alloy round rod with the diameter of 9.5 mm, the uneven tissue components of the aluminum alloy round rod can be eliminated, the uniformity of the tissue components of an aluminum alloy wire is improved, finally, the strength and the plasticity of the aluminum alloy wire can be improved, and the stability and the consistency of the strength and the conductivity of the aluminum alloy wire in the length direction can be greatly improved.
The seventh step: drawing an aluminum alloy round rod into an aluminum alloy wire with the diameter of 1-5 mm in a torque-free manner under the conditions that the pass drawing deformation is 1-2% and the drawing speed is 9-12 m/s;
the drawing process of the aluminum alloy round rod is to pass the aluminum alloy round rod through a drawing machine consisting of a series of drawing dies with different diameters of die holes and finally draw the aluminum alloy round rod into aluminum alloy wires with different diameters. Traditional aluminum alloy round bar drawing machine set's drum is driven by same inverter motor, and this kind of drawing mode makes easily to produce between aluminum alloy wire and the drum and slides and aluminum alloy wire produces the wrench movement, finally leads to the surface of aluminum alloy wire to appear fish tail and fracture to aluminum alloy wire's production stability and production efficiency have been reduced. In order to solve the problems, the invention adopts a distributor motor transmission non-sliding type drawing machine set to realize the torque-free drawing of the aluminum alloy round bar, and is characterized in that: every drum wheel of drawing unit is driven by a inverter motor alone, every drum wheel is equipped with aluminum alloy wire distributing wheel and tension controller, the rotational speed of every drum wheel is fed back the signal to PLC programmable logic controller by tension controller, again by PLC programmable logic controller automatic adjustment every drum wheel inverter motor rotational speed, thereby realize the automatic adjustment of speed-increasing ratio between the drum wheels, guarantee that the line speed of walking of drawing in-process aluminum alloy wire equals with the drum wheel linear velocity, there is not slip and friction between aluminum alloy wire and the drum wheel, avoid drawing in-process aluminum alloy wire and produce along oneself axis and twist reverse, realized no moment of torsion and drawn, avoid the aluminum alloy wire to draw in-process and break, improved aluminum alloy wire and drawn stability and production efficiency of production.
Eighth step: aging the aluminum alloy wire at 130-140 ℃ for 2-3 hours, then continuously heating to 160-170 ℃ for aging for 5-6 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
After systematic research on the aging process of the aluminum alloy conductor, the inventor of the application finds that the aluminum alloy conductor is aged for 2-3 hours at 130-140 ℃, then is continuously heated to 160-170 ℃ and is aged for 5-6 hours, and the aluminum alloy conductor for the overhead stranded wire is obtained after furnace cooling, wherein the tensile strength of the aluminum alloy conductor is greater than 330MPa, and the electric conductivity of the aluminum alloy conductor is greater than 53% IACS. If the aging step, the aging temperature and the aging time are not in the matching ranges, the aluminum alloy wire has underaging or overaging problems, the tensile strength of the aluminum alloy wire is less than 330MPa, and the electric conductivity of the aluminum alloy wire is less than 53% IACS.
In order to more specifically describe the aluminum alloy wire for an overhead twisted wire and the method for manufacturing the same according to the present invention, several examples and comparative examples will be described below.
Example 1:
the aluminum alloy conductor for the overhead stranded wire comprises the following components in percentage by mass: 1.3 percent of Mg, 1.7 percent of Si, 0.1 percent of La0, 0.025 percent of Ce, 0.03 percent of Cr, 0.015 percent of V, 0.0075 percent of Ti, 0.00075 percent of B, less than or equal to 0.15 percent of Fe, the balance of Al and inevitable other impurities, the single content of other impurities is less than or equal to 0.01 percent, and the total content of other impurities is less than or equal to 0.05 percent. The manufacturing method of the aluminum alloy conductor comprises the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
the second step is that: heating and melting an aluminum ingot in a heating furnace at 770 ℃, then adding a magnesium ingot accounting for 1.3 percent of the total weight of the raw materials, 8.5 percent of Al-20Si alloy, 0.15 percent of Al-20Cr alloy, 0.15 percent of Al-10V alloy and 0.125 percent of lanthanum-cerium mixed rare earth, and stirring and melting into aluminum alloy liquid;
the third step: blowing and refining the aluminum alloy liquid in the furnace for 15 minutes by using argon with the purity of 99.99 percent and hexachloroethane refining agent accounting for 0.8 percent of the total weight of the raw materials to carry out degassing and impurity removal treatment, and standing for 40 minutes after slagging off;
the fourth step: introducing the aluminum alloy liquid in the furnace into a launder, and adding an Al-5Ti-0.5B alloy rod accounting for 0.15 percent of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degasser graphite rotor and a ceramic filter plate, wherein the degasser graphite rotor is arranged on a launder, the rotating speed of the degasser graphite rotor is 180 revolutions per minute, the argon purity of the degasser graphite rotor is 99.99 percent, and the argon flow rate of the degasser graphite rotor is 1.5 cubic meters per hour, and the porosity of the degasser graphite rotor is 55ppi, so that online degassing and filtering treatment is;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of the continuous casting machine is 17.5 m/min, the ultrasonic output frequency is 12kHz and the ultrasonic output power is 900 watts, and cooling the aluminum alloy round rod to room temperature through water for online quenching;
the seventh step: drawing the aluminum alloy round bar into an aluminum alloy wire with the diameter of 3 mm in a torque-free manner under the conditions that the pass drawing deformation is 1.5% and the drawing speed is 11 m/s;
eighth step: aging the aluminum alloy wire at 135 ℃ for 2.5 hours, then continuing to heat to 165 ℃ for aging for 5.5 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
Example 2:
the aluminum alloy conductor for the overhead stranded wire comprises the following components in percentage by mass: 1.2 percent of Mg, 1.8 percent of Si, 0.08 percent of La0, 0.02 percent of Ce, 0.04 percent of Cr, 0.02 percent of V, 0.005 percent of Ti, 0.0005 percent of B, less than or equal to 0.15 percent of Fe, the balance of Al and inevitable other impurities, the single content of other impurities is less than or equal to 0.01 percent, and the total content of other impurities is less than or equal to 0.05 percent. The manufacturing method of the aluminum alloy conductor comprises the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
the second step is that: heating and melting an aluminum ingot in a heating furnace at 780 ℃, then adding a magnesium ingot accounting for 1.2 percent of the total weight of the raw materials, 9 percent of Al-20Si alloy, 0.2 percent of Al-20Cr alloy, 0.2 percent of Al-10V alloy and 0.1 percent of lanthanum-cerium mixed rare earth, and stirring and melting the mixture into aluminum alloy liquid;
the third step: blowing and refining aluminum alloy liquid in the furnace for 10 minutes by using argon with the purity of 99.99 percent and hexachloroethane refining agent accounting for 1 percent of the total weight of the raw materials to carry out degassing and impurity removal treatment, and standing for 30 minutes after slagging off;
the fourth step: introducing the aluminum alloy liquid in the furnace into a launder, and adding an Al-5Ti-0.5B alloy rod accounting for 0.1 percent of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degasser graphite rotor and a ceramic filter plate, wherein the degasser graphite rotor is arranged on a launder, the rotating speed of the degasser graphite rotor is 200 revolutions per minute, the argon purity of the degasser graphite rotor is 99.99 percent, and the argon flow is 1 cubic meter per hour, and the porosity of the degasser graphite rotor is 50ppi, so that online degassing and filtering treatment is performed;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of a continuous casting machine is 17 m/min, the ultrasonic output frequency is 10kHz, and the ultrasonic output power is 1000W, and cooling the aluminum alloy round rod to room temperature through water for online quenching;
the seventh step: drawing the aluminum alloy round bar into an aluminum alloy wire with the diameter of 1 mm in a non-torque manner under the conditions that the pass drawing deformation is 2% and the drawing speed is 9 m/s;
eighth step: aging the aluminum alloy wire at 140 ℃ for 2 hours, then continuing to heat to 160 ℃ for aging for 6 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
Example 3:
the aluminum alloy conductor for the overhead stranded wire comprises the following components in percentage by mass: 1.4 percent of Mg, 1.6 percent of Si, 0.12 percent of La0, 0.03 percent of Ce, 0.02 percent of Cr, 0.01 percent of V, 0.01 percent of Ti, 0.001 percent of B, less than or equal to 0.15 percent of Fe, the balance of Al and inevitable other impurities, the single content of other impurities is less than or equal to 0.01 percent, and the total content of other impurities is less than or equal to 0.05 percent. The manufacturing method of the aluminum alloy conductor comprises the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
the second step is that: heating and melting an aluminum ingot in a heating furnace at 760 ℃, then adding a magnesium ingot accounting for 1.4 percent of the total weight of the raw materials, 8 percent of Al-20Si alloy, 0.1 percent of Al-20Cr alloy, 0.1 percent of Al-10V alloy and 0.15 percent of lanthanum-cerium mischmetal, and stirring and melting the mixture into aluminum alloy liquid;
the third step: blowing and refining aluminum alloy liquid in the furnace for 20 minutes by using argon with the purity of 99.99 percent and hexachloroethane refining agent accounting for 0.5 percent of the total weight of the raw materials to carry out degassing and impurity removal treatment, and standing for 60 minutes after slagging off;
the fourth step: introducing the aluminum alloy liquid in the furnace into a launder, and adding an Al-5Ti-0.5B alloy rod accounting for 0.2 percent of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degasser graphite rotor and a ceramic filter plate, wherein the degasser graphite rotor is arranged on a launder, the rotating speed of the degasser graphite rotor is 150 revolutions per minute, the argon purity of the degasser graphite rotor is 99.99 percent, and the argon flow rate of the degasser graphite rotor is 2 cubic meters per hour, and the porosity of the degasser graphite rotor is 60ppi, so that online degassing and filtering treatment is;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of a continuous casting machine is 18 m/min, the ultrasonic output frequency is 15kHz and the ultrasonic output power is 800 watts, and cooling the aluminum alloy round rod to room temperature through water for online quenching;
the seventh step: drawing the aluminum alloy round bar into an aluminum alloy wire with the diameter of 5 mm in a non-torque manner under the conditions that the pass drawing deformation is 1% and the drawing speed is 12 m/s;
eighth step: aging the aluminum alloy wire at 130 ℃ for 3 hours, then continuing to heat to 170 ℃ for aging for 5 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
Comparative example 1:
the aluminum alloy conductor for the overhead stranded wire comprises the following components in percentage by mass: 1.1 percent of Mg, 1.7 percent of Si, 0.1 percent of La0, 0.025 percent of Ce, 0.03 percent of Cr, 0.015 percent of V, 0.0075 percent of Ti, 0.00075 percent of B, less than or equal to 0.15 percent of Fe, the balance of Al and inevitable other impurities, the single content of other impurities is less than or equal to 0.01 percent, and the total content of other impurities is less than or equal to 0.05 percent. The manufacturing method of the aluminum alloy conductor comprises the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
the second step is that: heating and melting an aluminum ingot in a heating furnace at 770 ℃, then adding a magnesium ingot accounting for 1.1 percent of the total weight of the raw materials, 8.5 percent of Al-20Si alloy, 0.15 percent of Al-20Cr alloy, 0.15 percent of Al-10V alloy and 0.125 percent of lanthanum-cerium mixed rare earth, and stirring and melting the mixture into aluminum alloy liquid;
the third step: blowing and refining the aluminum alloy liquid in the furnace for 15 minutes by using argon with the purity of 99.99 percent and hexachloroethane refining agent accounting for 0.8 percent of the total weight of the raw materials to carry out degassing and impurity removal treatment, and standing for 40 minutes after slagging off;
the fourth step: introducing the aluminum alloy liquid in the furnace into a launder, and adding an Al-5Ti-0.5B alloy rod accounting for 0.15 percent of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degasser graphite rotor and a ceramic filter plate, wherein the degasser graphite rotor is arranged on a launder, the rotating speed of the degasser graphite rotor is 180 revolutions per minute, the argon purity of the degasser graphite rotor is 99.99 percent, and the argon flow rate of the degasser graphite rotor is 1.5 cubic meters per hour, and the porosity of the degasser graphite rotor is 55ppi, so that online degassing and filtering treatment is;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of the continuous casting machine is 17.5 m/min, the ultrasonic output frequency is 12kHz and the ultrasonic output power is 900 watts, and cooling the aluminum alloy round rod to room temperature through water for online quenching;
the seventh step: drawing the aluminum alloy round bar into an aluminum alloy wire with the diameter of 3 mm in a torque-free manner under the conditions that the pass drawing deformation is 1.5% and the drawing speed is 11 m/s;
eighth step: aging the aluminum alloy wire at 135 ℃ for 2.5 hours, then continuing to heat to 165 ℃ for aging for 5.5 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
Comparative example 2:
the aluminum alloy conductor for the overhead stranded wire comprises the following components in percentage by mass: 1.2 percent of Mg, 1.8 percent of Si, 0.06 percent of La0, 0.04 percent of Ce, 0.04 percent of Cr, 0.02 percent of V, 0.005 percent of Ti, 0.0005 percent of B, less than or equal to 0.15 percent of Fe, the balance of Al and inevitable other impurities, the single content of other impurities is less than or equal to 0.01 percent, and the total content of other impurities is less than or equal to 0.05 percent. The manufacturing method of the aluminum alloy conductor comprises the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 60%, Ce 40%;
the second step is that: heating and melting an aluminum ingot in a heating furnace at 780 ℃, then adding a magnesium ingot accounting for 1.2 percent of the total weight of the raw materials, 9 percent of Al-20Si alloy, 0.2 percent of Al-20Cr alloy, 0.2 percent of Al-10V alloy and 0.1 percent of lanthanum-cerium mixed rare earth, and stirring and melting the mixture into aluminum alloy liquid;
the third step: blowing and refining aluminum alloy liquid in the furnace for 10 minutes by using argon with the purity of 99.99 percent and hexachloroethane refining agent accounting for 1 percent of the total weight of the raw materials to carry out degassing and impurity removal treatment, and standing for 30 minutes after slagging off;
the fourth step: introducing the aluminum alloy liquid in the furnace into a launder, and adding an Al-5Ti-0.5B alloy rod accounting for 0.1 percent of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degasser graphite rotor and a ceramic filter plate, wherein the degasser graphite rotor is arranged on a launder, the rotating speed of the degasser graphite rotor is 200 revolutions per minute, the argon purity of the degasser graphite rotor is 99.99 percent, and the argon flow is 1 cubic meter per hour, and the porosity of the degasser graphite rotor is 50ppi, so that online degassing and filtering treatment is performed;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of a continuous casting machine is 17 m/min, the ultrasonic output frequency is 10kHz, and the ultrasonic output power is 1000W, and cooling the aluminum alloy round rod to room temperature through water for online quenching;
the seventh step: drawing the aluminum alloy round bar into an aluminum alloy wire with the diameter of 1 mm in a non-torque manner under the conditions that the pass drawing deformation is 2% and the drawing speed is 9 m/s;
eighth step: aging the aluminum alloy wire at 140 ℃ for 2 hours, then continuing to heat to 160 ℃ for aging for 6 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
Comparative example 3:
the aluminum alloy conductor for the overhead stranded wire comprises the following components in percentage by mass: 1.4 percent of Mg, 1.6 percent of Si, 0.12 percent of La0, 0.03 percent of Ce, 0.02 percent of Cr, 0.02 percent of V, 0.01 percent of Ti, 0.001 percent of B, less than or equal to 0.15 percent of Fe, the balance of Al and inevitable other impurities, the single content of other impurities is less than or equal to 0.01 percent, and the total content of other impurities is less than or equal to 0.05 percent. The manufacturing method of the aluminum alloy conductor comprises the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
the second step is that: heating and melting an aluminum ingot in a heating furnace at 760 ℃, then adding a magnesium ingot accounting for 1.4 percent of the total weight of the raw materials, 8 percent of Al-20Si alloy, 0.1 percent of Al-20Cr alloy, 0.2 percent of Al-10V alloy and 0.15 percent of lanthanum-cerium mischmetal, and stirring and melting the mixture into aluminum alloy liquid;
the third step: blowing and refining aluminum alloy liquid in the furnace for 20 minutes by using argon with the purity of 99.99 percent and hexachloroethane refining agent accounting for 0.5 percent of the total weight of the raw materials to carry out degassing and impurity removal treatment, and standing for 60 minutes after slagging off;
the fourth step: introducing the aluminum alloy liquid in the furnace into a launder, and adding an Al-5Ti-0.5B alloy rod accounting for 0.2 percent of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degasser graphite rotor and a ceramic filter plate, wherein the degasser graphite rotor is arranged on a launder, the rotating speed of the degasser graphite rotor is 150 revolutions per minute, the argon purity of the degasser graphite rotor is 99.99 percent, and the argon flow rate of the degasser graphite rotor is 2 cubic meters per hour, and the porosity of the degasser graphite rotor is 60ppi, so that online degassing and filtering treatment is;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of a continuous casting machine is 18 m/min, the ultrasonic output frequency is 15kHz and the ultrasonic output power is 800 watts, and cooling the aluminum alloy round rod to room temperature through water for online quenching;
the seventh step: drawing the aluminum alloy round bar into an aluminum alloy wire with the diameter of 5 mm in a non-torque manner under the conditions that the pass drawing deformation is 1% and the drawing speed is 12 m/s;
eighth step: aging the aluminum alloy wire at 130 ℃ for 3 hours, then continuing to heat to 170 ℃ for aging for 5 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
Samples were taken from the aluminum alloy wires of examples 1 to 3 and comparative examples 1 to 3, and the aluminum alloy wires were drawn at room temperature on an NYP2009 type electronic drawing machine at a drawing speed of 2 mm/min, and the tensile strength and the elongation after fracture of the aluminum alloy wires were measured, and the results are shown in table 1. The conductivity of the aluminum alloy wire was measured on a WCW0603 type DC double arm bridge, and the results are shown in Table 1.
As can be seen from the detection results in Table 1, the tensile strength of the aluminum alloy wires of the embodiments 1 to 3 is greater than 330MPa, the elongation after fracture is greater than 4.5%, and the electric conductivity is greater than 53% IACS. The aluminum alloy wire of comparative example 1 had a strength of less than 330MPa due to the Mg content of less than 1.2%. The aluminum alloy wire of comparative example 2 has an electrical conductivity of less than 53% IACS because the mass ratio of La to Ce is not equal to 4: 1. The aluminum alloy wire of comparative example 3 had a strength of less than 330MPa because the mass ratio of Cr to V was not equal to 2: 1.
While the present invention has been described by way of examples, and not by way of limitation, other variations of the disclosed embodiments, as would be readily apparent to one of skill in the art, are intended to be within the scope of the present invention, as defined by the claims.
Claims (1)
1. A manufacturing method of an aluminum alloy conductor for an overhead stranded wire is characterized by comprising the following steps: the aluminum alloy conductor comprises the following components in percentage by mass: 1.2-1.4% of Mg, 1.6-1.8% of Si, 0.08-0.12% of La, 0.02-0.03% of Ce, 0.02-0.04% of Cr, 0.01-0.02% of V, 0.005-0.01% of Ti, 0.0005-0.001% of B, less than or equal to 0.15% of Fe, and the balance of Al and inevitable other impurities, wherein the mass ratio of La to Ce is 4:1, the mass ratio of Cr to V is 2:1, the mass ratio of Ti to B is 10:1, the single content of other impurities is less than or equal to 0.01%, and the total content is less than or equal to 0.05%; the manufacturing method of the aluminum alloy conductor comprises the following steps:
the first step is as follows: aluminum ingots, Mg9990 primary magnesium ingots, Al-20Si alloys, Al-20Cr alloys, Al-10V alloys, Al-5Ti-0.5B alloy rods and lanthanum-cerium mixed rare earth are selected as raw materials for remelting with an Al99.85 brand, and the lanthanum-cerium mixed rare earth comprises the following components in percentage by mass: la 80% and Ce 20%;
the second step is that: heating and melting an aluminum ingot at 760-780 ℃, adding a magnesium ingot accounting for 1.2-1.4% of the total weight of the raw materials, 8-9% of Al-20Si alloy, 0.1-0.2% of Al-20Cr alloy, 0.1-0.2% of Al-10V alloy and 0.1-0.15% of lanthanum-cerium mixed rare earth, and stirring and melting to obtain aluminum alloy liquid;
the third step: blowing and refining the aluminum alloy liquid for 10-20 minutes by using argon with the purity of 99.99% and a refining agent accounting for 0.5-1% of the total weight of the raw materials, degassing and removing impurities, slagging off, and then standing for 30-60 minutes;
the fourth step: introducing the aluminum alloy liquid into a launder, and adding Al-5Ti-0.5B alloy rods accounting for 0.1-0.2% of the total weight of the raw materials for online grain refinement treatment;
the fifth step: enabling the aluminum alloy liquid to sequentially flow through a degassing machine graphite rotor with the rotation speed of 150-200 revolutions per minute, the argon purity of 99.99 percent and the argon flow of 1-2 cubic meters per hour and a ceramic filter plate with the porosity of 50-60 ppi on a launder to carry out online degassing and filtering treatment;
and a sixth step: the method comprises the following steps of (1) enabling an aluminum alloy liquid to flow into a continuous casting and rolling machine, continuously casting and rolling the aluminum alloy liquid into an aluminum alloy round rod with the diameter of 9.5 mm under the conditions that the temperature of the aluminum alloy liquid is 690 ℃, the rotating linear speed of a crystallizing wheel of the continuous casting machine is 17-18 m/min, the ultrasonic output frequency is 10-15 kHz, and the ultrasonic output power is 800-1000W, and cooling the aluminum alloy round rod to the room temperature through water for online quenching;
the seventh step: drawing an aluminum alloy round rod into an aluminum alloy wire with the diameter of 1-5 mm in a torque-free manner under the conditions that the pass drawing deformation is 1-2% and the drawing speed is 9-12 m/s;
eighth step: aging the aluminum alloy wire at 130-140 ℃ for 2-3 hours, then continuously heating to 160-170 ℃ for aging for 5-6 hours, and cooling along with the furnace to obtain the aluminum alloy wire for the overhead stranded wire.
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Address after: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee after: Industrial analysis and testing center of Guangdong Academy of Sciences Address before: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee before: GUANGDONG INDUSTRY ANALYSIS TESTING CENTER |