Method for preparing phi7.0mm1770MPa high-strength low-relaxation zinc-coated wire

Abstract

The invention relates to a manufacturing method of φ7.0mm1770MPa high-strength and low-relaxation galvanized steel wire. The technological process is: wire rod re-inspection→surface preparation→wire drawing→hot-dip galvanizing→stabilization treatment→inspection. Due to absorbing the advantages of the two traditional processes of "die drawing" and "double tensioning", by adding a "double tensioning" production line to the production line to wipe and smooth the surface of the steel wire and limit the diameter of the steel wire. The "diameter limiting die" that does not cause deformation of the steel wire as a whole, performs low-temperature tempering and surface smoothing treatment on the steel wire while applying tension to the steel wire, so that the steel wire has a smooth surface while obtaining low relaxation performance, and the production A high-strength, low-relaxation galvanized steel wire with high strength, low relaxation, high toughness and plasticity and high torsional performance is produced, which effectively overcomes the drawbacks of the existing technology that cannot simultaneously take into account high strength, low relaxation and high torsional performance, enabling production It has become a reality to produce galvanized steel wires for stay cables that fully meet the requirements of technical indicators.

Description

technical field [0001] The invention relates to the technical field of φ7.0mm1770MPa steel wire forming, in particular to a manufacturing method of high-strength and low-relaxation galvanized steel wire. Background technique [0002] In order to realize the ultra-large span of the bridge, to meet the construction requirements of highways, long-span suspension bridges, and cable-stayed suspension bridges, as well as the absolute reliability and high safety requirements, high-strength, low-slack, twisted galvanized steel wire has become the key material for manufacturing cables , for the galvanized steel wire of the stay cable used in the construction of the bridge, in addition to the requirements of high strength and low relaxation, there are also requirements to meet the requirements of high torsional performance and good linearity. In the past, the galvanized steel wire used for the stay cable only had the requirement of low relaxation and no requirement of torsion index. ...

AI Technical Summary

Problems solved by technology

Under normal circumstances, these two processes have their own characteristics but are difficult to be compatible. In the "die-drawing" process, the deformation of the steel wire must be more than 10% to obtain sufficient tension. The advantages are simple equipment and relatively good product surface quality. The disadvantages are: The toughness and plasticity are poor; the equipment in the "double tensioning" process is relatively complex, and the product has good toughness and plasticity, but the surface quality is poor, which often cannot meet user requirements

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