High-strength aluminum-clad steel wire and production method thereof

Abstract

The invention discloses a high-strength aluminum-clad steel wire and a production method thereof. The high-strength aluminum-clad steel wire comprises a steel core and an aluminum layer clad on the outer surface of the steel core; two opposite edges of the aluminum layer are welded and connected, and a welding line is formed at the welding point; and the steel core comprises the following components in percentages by weight: 0.58% to 0.78% of carbon, 0.1% to 0.3% of silicon, 0.2% to 0.4% of manganese, 1.2% to 1.5% of chromium, 1.2% to 1.5% of nickel, 0.4% to 0.6% of molybdenum, 0.03% to 0.05% of rare earth elements and the balance of Fe. The high-strength aluminum-clad steel wire disclosed by the invention has the performances of high conductivity, high heat resistance and low creep deformation.

Description

technical field [0001] The invention relates to the technical field of wire and cable conductors, in particular to a high-strength aluminum-clad steel wire and a production method thereof. Background technique [0002] Aluminum-clad steel wire is a bimetallic wire composed of a round steel wire that is uniformly and continuously tightly coated with a layer of pure aluminum. It has the characteristics of high strength, heat resistance, corrosion resistance, large capacity, and low loss. Therefore, It has irreplaceable advantages in long-distance power transmission. At present, the overhead lines of power transmission in various countries in the world basically use aluminum-clad steel-cored aluminum stranded wires. In order to increase the output capacity, the continuous use temperature of the lines is increased from 70 degrees to 140 degrees, and the current carrying capacity of the lines can be doubled. The creep of the lower aluminum-clad steel wire is large, the sag is in...

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Problems solved by technology

At present, the overhead lines of power transmission in various countries in the world basically use aluminum-clad steel-cored aluminum stranded wires. In order to increase the output capacity, the continuous use temperature of the lines is increased from 70 degrees to 140 degrees, and the current carrying capacity of the lines can be doubled. The creep of the lower aluminum-clad steel wire is large, the sag is increased, and the air gap distance between the line and the ground and crossing is reduced, which affects the safety of the power grid; and the aluminum-clad steel wire in the prior art usually adopts a continuous extrusion coating machine, The aluminum rod is formed into a semi-molten state in the mold cavity, so that it passes through both sides of the steel wire at the same time. Under the action of extrusion force and traction force, it is combined with the steel wire and extruded out of the die hole together to form a steel wire covered with an aluminum layer. Then through 8 to 10 steps of drawing, the finished aluminum-clad steel wire is obtained

This method has high production cost and low efficiency, and when the aluminum layer is extruded and coated, it is easy to form a seam at the confluence of the two strands, causing the finished product to have the defect of cracking of the aluminum layer after bending or drawing

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