On-line determination device of transformation ratio for metallic materials

A metal material, phase change technology, applied in the direction of material magnetic variable, heat treatment equipment, heat treatment process control, etc., can solve the problems of slow response time, poor measurement characteristics, poor precision, etc., to achieve accurate phase change degree, accurate measurement, ensure The effect of online measurement

Inactive Publication Date: 2008-10-08
POHANG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, it has the following disadvantages: slow response time, poor accuracy, poor measurement characteristics obtained with radiation thermometers in water-cooled environments
However, these techniques require structurally

Method used

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  • On-line determination device of transformation ratio for metallic materials
  • On-line determination device of transformation ratio for metallic materials
  • On-line determination device of transformation ratio for metallic materials

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Embodiment Construction

[0052] The features and advantages of the present invention will now be described in detail with reference to the accompanying drawings in order to understand the above objects.

[0053] Figure 4 is a graph showing phase transition and magnetic characteristic change during cooling heat treatment according to the present invention. As described above, when a hot-rolled metal material such as a strip enters a cooling heat treatment process (for example, ROT and ACC), the cooling unit sprays a predetermined amount of cooling water onto the top and bottom surfaces of the metal strip, thereby, The metal strip is cooled. After the austenitic metal strip is hot rolled, it is transported at high speed to the cooling heat treatment process. During the cooling heat treatment, the austenitic metal strip is cooled and exported as ferrite.

[0054] refer to Figure 4 , the metal strip just after hot rolling has a temperature of about 750° C. to 800° C. (see point (a)). At point (a), ...

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PUM

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Abstract

An on-line measuring system for the degree of transformation includes a U-shaped yoke member having both ends extending toward a surface of a metallic material; first and second magnetic members arranged at both ends of the yoke member, respectively; a magnetic flux sensor for detecting a leakage magnetic flux flowing along a magnetic circuit composed of the first magnetic member, the metallic material, the second magnetic member and the yoke member; and an analyzer for measuring the degree of transformation on the metallic material according to the intensity of the detected leakage magnetic flux by using a preset relationship between the degree of transformation on the metallic material and a leakage magnetic flux intensity. The degree of transformation can be precisely measured even in a hostile environment such as high temperature in the cooling heat treatment.

Description

technical field [0001] The present invention generally relates to an on-line measurement system for measuring the degree of phase change on metallic materials, in particular to an on-line measurement system for measuring the degree of phase change on metallic materials during steelmaking, which is designed to measure ) and the degree of phase transformation on the metallic material that occurs during the cooling heat treatment in the accelerated cooling chamber (ACC). Background technique [0002] Generally speaking, when a hot-rolled metal material is rapidly cooled, a phase transformation occurs, from a high-temperature stable phase change of austenite to a phase such as ferrite, bainite, and martensite (hereinafter collectively referred to as "ferrite"). ”) such a low-temperature stable phase. This advantageously improves mechanical properties such as tensile strength and saves welding labor since high heat input enables welding. Therefore, generally in the steelmaking ...

Claims

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Application Information

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IPC IPC(8): G01N27/80
CPCG01N27/80C21D11/00
Inventor 李载庆
Owner POHANG IRON & STEEL CO LTD
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