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Device for realizing online ageing of hard wire rods by applying pulsed magnetic field and processing method

A pulsed magnetic field, hard wire technology, applied in the direction of heat treatment furnace, heat treatment equipment, furnace type, etc.

Inactive Publication Date: 2016-07-13
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no public report on shortening the aging time to the point where it can be completed on the production line, that is, on-line aging

Method used

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  • Device for realizing online ageing of hard wire rods by applying pulsed magnetic field and processing method

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Experimental program
Comparison scheme
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 coil is hung on the C-shaped hook on the special device proposed by the present invention in the transportation line after hot-rolling, spinning, cooling, and coil collection (note that before hanging, an induction coil has been installed on the C-shaped hook ), after which another induction coil is installed. The temperature control device starts to measure the temperature, and the temperature is displayed as 330°C (not lower than 300°C), and a signal is given to turn on the pulse power supply and start timing. The magnetic field strength in the control coil is 12000A / m, and the magnetic field frequency is 60Hz. When the C-shaped hook runs for 300s, disconnect the pulse power supply and the aging is over. After the C-shaped hook runs to the collection place, the induc...

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 coil is hung on the C-shaped hook on the special device proposed by the present invention in the transportation line after hot-rolling, spinning, cooling, and coil collection (note that before hanging, an induction coil has been installed on the C-shaped hook ), after which another induction coil is installed. The temperature control device starts to measure the temperature, the temperature is displayed as 350°C (not lower than 300°C), a signal is given to turn on the pulse power supply, and the timing starts. The magnetic field strength in the control coil is 15000A / m, and the magnetic field frequency is 80Hz. When the C-shaped hook runs for 420s, disconnect the pulse power supply and the aging is over. After the C-shaped hook runs to the collection place, the induction co...

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Abstract

The invention discloses a device for realizing online ageing of hard wire rods by applying a pulsed magnetic field and a processing method, and belongs to the technical field of wire rod production and product preparation. The device is characterized in that a magnetic field generation device for online ageing is imported onto conveying equipment after the collection and coiling of wire rod production lines. The device mainly consists of a pulsed power supply, an induction coil, a C-shaped hook, a bearing sleeve and a temperature control device. According to the method, the structure defects, generated in the rolling and cooling processes, of the materials are improved through controlling the magnetic field intensity (10000-30000A / m), the magnetic field frequency (20-100Hz) and the magnetic field action time (300-600s) by utilizing a magnetic field technology and combining the afterheat after the collection coiling, so that the mechanical property is improved and the online ageing of the hard wire rods is realized in the conveying process. According to the device and the method, the inventory time required by the natural ageing can be shortened.

Description

technical field [0001] The invention belongs to the technical field of wire rod production and its product preparation, and mainly relates to an online aging device and processing method for hard wire rods by using a pulsed magnetic field. Background technique [0002] Steel wire rods such as SWRH82B and 77B for high-strength prestressed steel strands have low section shrinkage after hot rolling, and they need to be placed for a period of time before they can be drawn. Otherwise, wire breakage will occur frequently due to low area shrinkage, drawing production efficiency will be low, and material utilization rate will not be high. During the period of natural placement after rolling, the mechanical properties of the hard wire rod change and the plasticity (reduction of area) is improved, which is the aging phenomenon of the hard wire wire rod. [0003] The aging of the wire rod produced by the factory is generally carried out in the warehouse. The aging time is the inventor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/52C21D1/04C21D6/00
CPCC21D1/04C21D6/004C21D6/005C21D6/008C21D9/525
Inventor 张永军韩静涛
Owner UNIV OF SCI & TECH BEIJING
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