On-line determination device of transformation ratio for metallic materials

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 ...

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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 complex systems and are hardly applicable to extremely harsh environments like ROT and ACC, especially, cannot be effective in accurately measuring the degree of phase transition on hot metal materials transported at high speed

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