An ultra-high-strength galvanized steel strand for long-span transmission lines

Abstract

The invention belongs to the technical field of galvanized steel strands, in particular to an ultra-high-strength galvanized steel strand for large-span transmission lines, which includes a central wire, and an inner layer, a middle layer and an outer layer are respectively twisted outside the central wire , the inner layer is right twisted, the middle layer is left twisted, and the outer layer is right twisted; the inner layer is 6 wires, the middle layer is 12 wires, the outer layer is 18 wires, the gap between the inner layer wires is 0, and the gap between the middle layer wires is not Greater than 0.10mm, the gap between the outer wire and the wire is not greater than 0.12mm, the nominal diameter after twisting is 20.16mm; the tensile strength of galvanized steel strand after twisting is ≥1960MPa, the 1% elongation stress is ≥1670MPa, and the elongation rate ≥ 4.0%, torsion ≥ 20 times / 360°, the surface gap of the steel strand is even, no looseness.

Description

technical field [0001] The invention belongs to the technical field of galvanized steel strands, in particular to an ultra-high-strength galvanized steel strand for large-span transmission lines. Background technique [0002] There is a large demand for long-distance and large-capacity power transmission of ultra-high-voltage and ultra-high-voltage transmission lines in my country, and domestic line resources are becoming increasingly scarce. Therefore, the design and production of the required large-span, ultra-long-distance, and large-section overhead conductors cannot be delayed. Among them, the galvanized steel strand, which is used as the load-bearing element of the overhead conductor, has become an indispensable part of the overhead conductor because of its high mechanical properties to support the weight of the conductor itself and the external load (wind, ice). The demand for ultra-high-strength galvanized steel strands is extremely high. [0003] However, at prese...

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Problems solved by technology

[0003] However, at present, the production process of ultra-high-strength galvanized steel strands above 1960MPa in China is immature, and the products produced have low strength, poor toughness, and poor looseness, which cannot meet market demand.

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