Hot-rolled rod online EDC water bath toughening treatment method for high-strength bridge cable galvanized steel wire

Abstract

The invention relates to a hot-rolled wire rod online EDC water bath toughening treatment method for a high-strength bridge cable galvanized steel wire. After rolled materials are rolled through high-speed wire rods, and after spinning, the wire rods are subjected to linear thermal relaxation, and EDC water bath toughening heat treatment and on-line heat collection and heat preservation are carried out; the thermal relaxation temperature is 820 DEG C-880 DEG C, and the thermal relaxation time is 10s-60s; after water bath cooling is carried out on the wire rods after online wire heat relaxation, the water bath temperature is 93 DEG C-100 DEG C, and the water bath cooling time is 30s-90s; the temperature of the water outlet of the wire rods after being cooled through EDC water bath is controlled to be 520 DEG-600 DEG C; and after water is discharged from the wire rods, heat collection is carried out, the heat collection temperature is 200 DEG C-400 DEG C, and the heat collection and heatpreservation time is 30min-2h. The hot-rolled wire rod online EDC water bath toughening treatment method is suitable for producing the wire rods with the diameter of phi 12.0mm-phi 16.0mm for the bridge cable galvanized steel wires, the specification range of the wire rods is wider, the diameter of the wire rods is larger, the tensile strength of the galvanized steel wires for a bridge cable by the wire rods is larger than or equal to 1960MPa, the number of twisting times is larger than or equal to 15 times, and the cable galvanized steel wire with the performance fills the domestic production blank.

Description

technical field [0001] The invention belongs to the technical field of steel wire rods, and in particular relates to a water bath toughening treatment method for wire rods. Background technique [0002] The galvanized steel wire of the bridge cable is used to manufacture the main cable or stay cable of the long-span bridge suspension cable. The galvanized steel wire used to manufacture the cable meets high strength and strict requirements on torsion index, and the wire rod requires the best match of strength and toughness. [0003] At present, the domestically produced wire rods used to manufacture this type of galvanized steel wire generally adopt the online stelmor air-cooling process. Due to the low cooling rate of the wire rod in this process, the sorbite content of the structure is below 90%, and the tensile strength of the wire rod through the coil The extreme difference is about 100MPa, the upper limit of production specification can only reach Φ13.0mm, and the wire ...

AI Technical Summary

Problems solved by technology

[0003] At present, the domestically produced wire rods used to manufacture this type of galvanized steel wire generally adopt the online stelmor air-cooling process. Due to the low cooling rate of the wire rod in this process, the sorbite content of the structure is below 90%, and the tensile strength of the wire rod through the coil The extreme difference is about 100MPa, the upper limit of the production specification can only reach Φ13.0mm, and the wire rod produced that meets the requirements of the galvanized steel wire index can only meet the 1860MPa level, and there is no wire rod production for the 1960MPa level in the market.

[0004] Chinese Patent Publication No. CN 104624680A relates to an off-line EDC production process. Before the material enters the EDC, the wire rod needs to be reheated and austenitized. For production, the energy consumption is relatively large, and the finished product involved in this patent can be used as The steel wire used for rope making cannot meet the production and use requirements of galvanized steel wire for bridge cables

[0005] The patent with the publication number of CN 102719643A involves quickly putting the hot-rolled wire rod into the lead bath or the salt bath for sorbitization of the wire rod. The cooling medium of the wire rod is lead liquid or salt liquid, which is more corrosive to the equipment. Large, there is a certain pollution to the environment, and it is difficult to popularize and apply

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