A kind of high conductivity duralumin wire and its preparation process

Abstract

The invention discloses a high-conductivity (63 percent IACS) hard aluminum wire and a preparing technology thereof. The preparing technology of the high-conductivity hard aluminum wire comprises the following steps that firstly, a high-conductivity aluminum rod is prepared in a continuous casting and rolling mode; secondly, the high-conductivity aluminum rod is drawn into high-conductivity aluminum wires which are drawn through various dies, wherein the coefficient of elongation of the last die is controlled within 1.35-1.50, and the coefficients of elongation of the other dies are controlled within 1.30-1.40; thirdly, a plurality of high-conductivity aluminum wires are twisted, the pay-off tension is controlled in the twisting process, the control air pressure is smaller than or equal to 3 kilograms, the tensile strength of the manufactured single hard aluminum wire is larger than or equal to 160 MPa, and the conductor resistance is smaller than or equal to 0.027366 Omega*mm<2> / m when the temperature is 20 DEG C. The tensile strength of the manufactured single hard aluminum wire in an overhead conductor is larger than or equal to 160 MPa, the conductor resistance is smaller than or equal to 0.027366 Omega*mm<2> / m when the temperature is 20 DEG C, the tensile strength of the hard aluminum wire is kept, the conductivity of the hard aluminum wire is increased to 63 percent IACS, and the conductivity is increased by 3.28 percent compared with the stipulated conductivity of a hard aluminum wire in common GB / T17937-2009. The high-conductivity hard aluminum wire is used in the overhead conductor, the loss of the circuit electric energy can be greatly reduced, the circuit operation cost is reduced, and the carrying capacity of the wire can be obviously improved.

Description

technical field [0001] The invention relates to a high-conductivity duralumin wire used for overhead wires and a preparation process thereof. Background technique [0002] As we all know, the higher the resistance of the wire, the greater the loss on the wire. According to relevant data reports, the annual power loss of my country's power grid transmission lines is more than 8.0% of the transmitted power, and about 400 to 600 billion kWh of electric energy is wasted on the line. How to reduce the large line loss faced by traditional wires, improve the efficiency of power transmission, and achieve energy-saving, environmentally friendly and economical operation. In recent years, the State Grid Corporation has vigorously advocated the development, promotion and application of energy-saving conductors. The main factors affecting the resistance of the wire are the resistivity of the conductor and the cross-sectional area of ​​the wire. Although the resistance of the wire can ...

AI Technical Summary

Problems solved by technology

[0003] Various methods have been adopted in the industry to reduce the resistivity of aluminum conductors, but the resistivity and strength of aluminum are generally mutually restricted

For example: changing the microstructure of aluminum by annealing can increase the conductivity of aluminum from 61%IACS to above 63%IACS, but the state of aluminum changes from a hard state to a soft state, resulting in a great decrease in its strength. 160-200MPa is reduced to 60-100MPa, so that the overall breaking force of the same cross-section conductor is reduced by 25%-30%, and the safety and reliability of the conductor are greatly reduced. Therefore, it is not suitable for overhead laying applications; people also choose low impurity content High-quality high-purity aluminum ingots are used to produce high-conductivity aluminum wires, but the increase in the purity of raw materials will inevitably lead to an increase in the cost of raw materials, making the price of high-conductivity wires much higher than the cost of ordinary wires; Recovery and other technological means reduce the influence of impurities, work hardening and other factors on the conductivity of aluminum. Although the conductivity can be properly improved through various optimization measures, the effect is not very obvious.

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