Nondestructive evaluation of carburized layer depth in furnace tubes of Cr35Ni45NbMA using magnetic field distortion and magnetic attraction force measurement methods

Li, Hengtao; Wu, Bin; Tang, Ruiqi; Wang, Yujue; Liu, Xiucheng; He, Chao

doi:10.1016/j.measurement.2022.110845

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…( 2012) studied a robot for furnace tube carburization layer detection based on ferromagnetic properties, and the method was used to determine the embrittlement and failure in parts of the furnace tube by carburization and ellipticity sensors Saijiro Y oshioka et al (2019) proposed a method to detect the depth of the carburized layer by electromagnetic detection. Li et al (2022) used magnetic field distortion (MFD) and magnetic attraction force (MAF) measurements to non-destructively assess the depth of carburized layer in furnace tubes. In the above cited literature references, for the electromagnetic-based detection methods of carburization layer, the instrumentation and operational discrimination are mostly complicated, and the lack of accurate quantitative measurements does not facilitate the application of on-site inspection and evaluation of ethylene pyrolysis furnace tubes.…”

Section: Introductionmentioning

confidence: 99%

Application of magnetic analyzers for detecting carburization of pyrolysis furnace tubes

Liu

et al. 2023

Front. Mater.

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Ethylene pyrolysis furnace is a key equipment in the ethylene production industry with the pyrolysis furnace tube being the core component of the system. The tube operates at high temperature (950°C–1,100°C) and hydrocarbon medium for a long time, and the Cr35Ni45Nb centrifugal casting alloy material is often chosen as the material of the tube. Due to its harsh working conditions, its common failure issues include carburization, high-temperature creep cracking, thermal shock and thermal fatigue, overheating, creep expansion, bending, etc. Among them, carburization is the main cause of furnace tube failure. In this work, based on the characteristics of HP series (ASTM HP grade) furnace tube material, which is transformed from paramagnetic material to ferromagnetic material following carburization, the cracking furnace tube with different carburization layer thickness has been prepared, and the coercivity of furnace tube with different thickness of carburization layer is tested by magnetic analyzer. The relationship curve between carburization layer thickness and coercivity is subsequently studied to find a means to test the carburization layer thickness in engineering. By fitting the experimental data, the fitting rate reached 97%, which in turn verified the validity and accuracy of the method.

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Section: Introductionmentioning

confidence: 99%

Application of magnetic analyzers for detecting carburization of pyrolysis furnace tubes

Liu

et al. 2023

Front. Mater.

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Combining ultrasonic guided wave and low-frequency electromagnetic technology for defect detection in high-temperature Cr–Ni alloy furnace tubes

Du,

Li,

Liu

et al. 2023

Sci Rep

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Cracking furnaces, operating under high temperatures and in a hydrocarbon medium, subject their tubes to complex stresses such as internal pressure, self-weight, fatigue, and thermal shock during start-up and shutdown. As a result, these furnace tubes frequently experience failures characterized by cracks and corrosion perforation. The high-temperature environment, constantly evolving structure of the tubes, and the close arrangement of the cracks within the tube box hinder detecting the cracks using conventional single-detection methods is challenging. This paper breaks through the limitations of the traditional single detection method and studies the effectiveness of the combination of ultrasonic-guided wave and low-frequency electromagnetic detection methods. The experiment was carried out by deliberately making cracks and thinning defects caused by corrosion on the cracking furnace tube of Cr35Ni45Nb after two years of service. The experimental results show that the ultrasonic guided wave detection technology can quickly detect the defects running through the whole furnace tube and effectively identify the manufacturing defects. On the other hand, low-frequency electromagnetic detection makes it possible to scan suspicious local defects and make qualitative and quantitative analyses of defect signals. The combination of ultrasonic guided wave and low-frequency electromagnetic detection can realize the rapid location and comprehensive qualitative and quantitative analysis of furnace tube defects, thus making up for the defects missed detection caused by the lack of effectiveness of single detection and the resulting safety problems. The research results have great popularization value in practical engineering applications.

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Nondestructive evaluation of carburized layer depth in furnace tubes of Cr35Ni45NbMA using magnetic field distortion and magnetic attraction force measurement methods

Cited by 2 publications

References 23 publications

Application of magnetic analyzers for detecting carburization of pyrolysis furnace tubes

Application of magnetic analyzers for detecting carburization of pyrolysis furnace tubes

Combining ultrasonic guided wave and low-frequency electromagnetic technology for defect detection in high-temperature Cr–Ni alloy furnace tubes

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