Proposal of Electromagnetic Inspection of Both Front Side and Rear Side Carburization Depth in Heating Furnace Steel Tubes

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  • 加熱炉鋼管の表裏面浸炭深さ電磁気検査手法の提案
  • カネツロ コウカン ノ ヒョウリメン シンタン フカサ デンジキ ケンサ シュホウ ノ テイアン

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In the steel tube of a large-sized heating furnace in an oil-refining plant, both the front side and rear side are carburized because of being used for many years in high-temperature environments. If these carburization depths increase the steel tube will explode suddenly and a big accident may occur. Therefore, the measurement of both the front side and rear side carburization depth are important in order to prevent accidents. In this paper, an electromagnetic inspection method for the carburized depth of both the front side and rear side of the steel tube is proposed. In this method, the alternating magnetic field of the two kinds of exciting frequency using one electromagnetic sensor is applied to the examined steel tube. Both carburization depths are obtained by evaluating the flux density in layers with and without carburization using the 3-D nonlinear FEM. It is shown that the inspection for the carburization depth of both the front side and rear side of the steel tube is possible by using the deference in permeability and conductivity of carburized layer.

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