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A hard-wire wire rod aging device and processing method using pulse current

A pulse current and pulse power supply technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc.

Inactive Publication Date: 2018-05-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As for the hard wire rod after the hot rolling that the present invention proposes, utilize pulse current and combine the method of temperature field effect to realize fast aging, also do not see that there is any public report

Method used

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  • A hard-wire wire rod aging device and processing method using pulse current

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Effect test

Embodiment 1

[0022] The hard line wire rod of this embodiment is SWRH82B, its specification is Φ8mm, chemical composition (mass fraction / %) is 0.82C, 0.26Si, 0.76Mn, 0.0010S, 0.0009P, 0.30Ni, 0.30Cr, and the rest is Fe. The hot-rolled coil is placed on the uncoiling device, and then the wire rod passes through the pinch roll, the tubular preheating furnace, the electrode, the tubular soaking furnace, the electrode, the lead-in roll, and enters the winding device. After that, turn on the power supply of the preheating furnace to preheat the wire rod entering the preheating furnace. When the preheating temperature reaches 260°C, turn on the power supply of the winding device, and the wire rod moves in the winding direction to start winding; Soaking furnace power supply and pulse power supply, conduct soaking and electric pulse treatment on the wire rod entering the soaking furnace to ensure that the temperature of the wire rod is 260°C and its running time in the soaking furnace is 420s (real...

Embodiment 2

[0026] The hard wire rod of this embodiment is SWRH77B, its specification is Φ12mm, chemical composition (mass fraction / %) is 0.78C, 0.22Si, 0.70Mn, 0.0009S, 0.0009P, 0.26Ni, 0.25Cr, and the rest is Fe. The hot-rolled coil is placed on the uncoiling device, and then the wire rod passes through the pinch roll, the tubular preheating furnace, the electrode, the tubular soaking furnace, the electrode, the lead-in roll, and enters the winding device. After that, turn on the power of the preheating furnace to preheat the wire rod entering the preheating furnace. When the preheating temperature reaches 320°C, turn on the power of the winding device, and the wire rod will move in the winding direction to start winding; Soaking furnace power supply and pulse power supply, conduct soaking and electric pulse treatment on the wire rod entering the soaking furnace to ensure that the temperature of the wire rod is 320°C and its running time in the soaking furnace is 510s (realized by contro...

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Abstract

A device for realizing aging of a hard wire coiled rod by applying pulse current and a treatment method belong to the technical field of wire material production and wire product preparation. The device mainly consists of a pulse power supply, a tubular preheating furnace, a tubular soaking pit, an uncoiling device, a pinch roller, a guide roller, a coiling device and an electrode. Atom diffusion and dislocation movement is promoted by an external field technology, that is pulse current. Structural defects of materials, produced in rolling and cooling processes, are improved through controlling the density (50-300A / mm<2>) and the frequency (20-80Hz) of pulse current in the coiled rod and combining the soaking effect of the tubular soaking pit, and mechanical properties are improved, so that the aging of the hard wire coiled rod is realized. The device and the treatment method have the advantages that aging treatment time is short, the effect is remarkable, warehousing time required by natural aging can be shortened, and enterprise circulating fund pressure is relieved.

Description

technical field [0001] The invention belongs to the technical field of wire rod production and product preparation, and mainly relates to a hard wire rod aging device and a processing method thereof by applying pulse current. Background technique [0002] Hard wire rods such as steel SWRH82B and 77B for high-strength prestressed steel strands have aging phenomena, that is, their reduction of area is low after hot rolling, and they need to be placed for a period of time before subsequent processing can be performed after the reduction of area increases. Such as pulling. Otherwise, due to the low area shrinkage and frequent wire breakage, the production efficiency will be low and the material utilization rate will not be high. [0003] The aging of the wire rod produced by the factory is generally carried out in the warehouse. The aging time is the inventory time. The aging time is not less than 15 days, and some even exceed 40 days. This not only consumes the time and space...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/56C21D1/04
CPCC21D1/04C21D9/56C22C38/02C22C38/04C22C38/08C22C38/18
Inventor 张永军韩静涛
Owner UNIV OF SCI & TECH BEIJING
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