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Technical Brief

Detection of Cracks in 25Cr35NiNb Ethylene Pyrolysis Furnace Tubes by Metal Magnetic Memory Technique

[+] Author and Article Information
Pengju Guo

National Engineering and Technology Research Center on
Pressure Vessel and Piping Safety,
Hefei General Machinery Research Institute,
Hefei 230031, China
e-mail: pengju163@163.com

Tao Chen

National Engineering and Technology Research Center
on Pressure Vessel and Piping Safety,
Hefei General Machinery Research Institute,
Hefei 230031, China
e-mail: chentaohf@163.com

Xiaoming Lian

National Engineering and Technology Research Center
on Pressure Vessel and Piping Safety,
Hefei General Machinery Research Institute,
Hefei 230031, China
e-mail: lianxiaom@163.com

Juan Ye

National Engineering and Technology Research Center
on Pressure Vessel and Piping Safety,
Hefei General Machinery Research Institute,
Hefei 230031, China
e-mail: yejuan0717@126.com

Weihe Guan

National Engineering and Technology Research Center
on Pressure Vessel and Piping Safety,
Hefei General Machinery Research Institute,
Hefei 230031, China
e-mail: guanwh9078@sina.com

Xuedong Chen

National Engineering and Technology Research Center
on Pressure Vessel and Piping Safety,
Hefei General Machinery Research Institute,
Hefei 230031, China
e-mail: chenxuedong@hgmri.com

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received March 23, 2016; final manuscript received December 19, 2016; published online February 3, 2017. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 139(2), 024501 (Feb 03, 2017) (4 pages) Paper No: PVT-16-1056; doi: 10.1115/1.4035694 History: Received March 23, 2016; Revised December 19, 2016

Cracking in 25Cr35NiNb pyrolysis furnace tubes is difficult to detect in engineering production. This paper presents a metal magnetic memory technique for inspecting cracks. To verify the effectiveness of the proposed technique, positions where abnormal magnetic signals existed were rechecked by penetration testing and scanning electron microscopy. Magnetic memory technique results agree well with penetration testing and scanning electron microscope results, providing an effective method to detect cracks in 25Cr35NiNb pyrolysis furnace tubes. However, further research is required for the magnetic memory technique to attain full maturity for use in engineering applications.

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References

Figures

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Fig. 1

Image of MMMT device (a) and characteristics of normal magnetic signals measured perpendicular to defects (b) [10]

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Fig. 2

Schematic diagram for inspection of ethylene pyrolysis furnace tubes using MMMT

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Fig. 3

Variation of Hp(y) and |K| along testing lines: #1 ((a) and (b)) and #2 ((c) and (d))

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Fig. 4

SEM image of tube #1 at the position presenting abnormal magnetic signals

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Fig. 5

PT results for tube #2 where abnormal magnetic signals are observed

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Fig. 6

SEM images of #2 sample without etching: (a)(d) correspond to 1–4 in Fig. 5

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