Method and apparatus for measuring magnetic transformation rate of steel sheet in annealing furnace, continuous annealing process, continuous hot-dip galvanizing process

摘要

Provided are a magnetic transformation rate measuring apparatus and a magnetic transformation rate measuring method of a steel sheet in an annealing furnace, and a continuous annealing process and a continuous hot-dip galvanizing process to which the magnetic transformation rate measuring method and magnetic transformation rate measuring apparatus are applied. The steel sheet is heat-treated in an annealing furnace using a drive coil disposed on one side of the surface of the steel sheet, and a receiving coil disposed on the same side as the drive coil and parallel to the surface of the steel sheet on both sides of the drive coil. As a method of measuring the magnetic transformation rate of a steel sheet before, an alternating drive signal is transmitted to the surface of the steel sheet by a drive coil having a size greater than or equal to the sheet width using an air core, and the driving signal reflected from the steel sheet is used using an air core Measured by a receiving coil having a size greater than or equal to the plate width, the distance between the steel plate and the driving coil is corrected by using the measurement value of the driving signal measured in the receiving coil by the measurement processing device, and the magnetism of the steel plate based on the corrected distance Measure the rate of transformation.