Alloy steel for overhead conductor, preparation method of alloy steel and overhead conductor

Abstract

The invention discloses alloy steel for an overhead conductor, a preparation method of alloy steel and the overhead conductor. The alloy steel comprises the following components in percentage by weight: 0.1-0.25wt% of C, 0.08-0.15wt% of Si, 0.2-0.3wt% of of Mn, less than or equal to 0.03wt% of of P, less than or equal to 0.025wt% of S, 32-36wt% of Ni, 0.5-0.7wt% of Cr, 0.8-1.3wt% of V, 0.4-0.6wt%of Be and the balance of Fe and unavoidable trace impurities. According to the invention, through changing the material ratio of the alloy steel, the crystalline grain is refined, the strength and tenacity of the alloy steel are improved and the cost is lowered. The tensile strength of the alloy steel is equal to or greater than 1500 MPa, the elongation is equal to or greater than 1.2%, and the expansion coefficient is equal to or less than 3.8*10<-6> / DEGC at 20-200 DEG C.

Description

technical field [0001] The invention relates to an alloy steel, in particular to an alloy steel for an overhead wire, a preparation method of the alloy steel and an overhead wire. Background technique [0002] The rapid development of the modern economy has accelerated the development of the electric power industry and greatly promoted the technological progress of transmission lines. As the carrier of power transmission, overhead transmission wire occupies an extremely important position in the transmission line. In order to safely and reliably transmit more electricity, scientific and technological workers in various countries are constantly striving to find ideal conductors for overhead transmission lines to replace traditional various conductors. For this reason, various special wires have emerged, for example, aluminum-clad steel-cored wires with anti-corrosion properties; high-strength steel-cored aluminum alloy wires, all-aluminum alloy wires, aluminum-clad steel-cor...

AI Technical Summary

Problems solved by technology

Increase the capacity of the conductor by increasing the cross-sectional area of ​​the conductor or increasing the number of conductors, which increases the weight of the conductor and the wind load, especially the increase in the tension of the conductor, which greatly increases the weight of the tower. The old line cannot be used and needs to be replaced or reconstructed. The original iron tower was demolished and the old line was rebuilt; although the current carrying capacity can be increased by increasing the operating temperature of the conductor, because the steel-cored aluminum stranded wire uses a common steel core, its thermal expansion coefficient is high and the sag is large, so it cannot be used for a long time at high temperature. Operation, the allowable working temperature of the steel-cored aluminum stranded wire is limited, so it is also very limited to use this method to increase the current carrying capacity

[0004] Heat-resistant aluminum alloy wires with high heat resistance and transmission capacity and low-slack wires with Invar cores can operate at high temperatures for a long time, and have the characteristics of "same diameter, same arc and double capacity", which can make full use of the original line path and tower resources , saving space and land resources, the transmission capacity can be more than doubled by replacing the transmission wire, which can ensure the safe transmission of power during the peak period of line power consumption, but the strength is low, the cost price is high, and the production and preparation technology is immature. Serious Restricted the popularization and application of this kind of wire

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