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The Relationship Between Magnetism and Microstructure of Ethylene Pyrolysis Furnace Tubes after a Long-term Service

Published online by Cambridge University Press:  18 October 2018

Jingfeng Guo Open the ORCID record for Jingfeng Guo [Opens in a new window] ,
Tieshan Cao ,
Congqian Cheng ,
Xianming Meng  and
Jie Zhao
Jingfeng Guo
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Tieshan Cao
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Congqian Cheng
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Xianming Meng
Affiliation:
China Automotive Technology & Research Center, Tianjin 300300, China
Jie Zhao*
Affiliation:
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
*
*Author for correspondence: Jie Zhao, E-mail: [email protected]
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Abstract

The magnetism and microstructure of Cr25Ni35Nb and Cr35Ni45Nb alloy tubes after 5 years of service were investigated in this paper. The saturation magnetization of the Cr25Ni35Nb alloy tube in the thickness direction is more than 20 emu/g, and the tube becomes ferromagnetic. The inner and outer walls of Cr35Ni45Nb alloy tubes also become ferromagnetic. But the saturation magnetization of the Cr35Ni45Nb alloy tubes approaches to zero in the center zone. The primary carbides M7C3 and NbC are changed into M23C6 and G phase at the outer region of the furnace tube. However, the M23C6-type carbides were replaced by carbon-rich carbides M7C3 at the carburization zone. Cr-depleted zones are formed at the inner and outer walls of the furnace tubes owing to oxidation. Carburization and oxidation reduce the Cr content of the matrix. Accordingly, the saturation magnetization is very high at the carburization zone and Cr-depleted zone. The magnetism of Cr25Ni35Nb and Cr35Ni45Nb alloy tubes has a high correlation with the Cr content of the matrix. Carburization and oxidation are the main reasons that make the paramagnetic ethylene pyrolysis furnace tube change to ferromagnetic.

Keywords

saturation magnetizationcarburizationoxidationCr-depleted zoneferromagnetic
Type
Materials Science Applications
Information
Microscopy and Microanalysis , Volume 24 , Issue 5 , October 2018 , pp. 478 - 487
Copyright
© Microscopy Society of America 2018 

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References

Allahkaram, SR, Borjali, S Khosravi, H (2012) Investigation of weldability and property changes of high pressure heat-resistant cast stainless steel tubes used in pyrolysis furnaces after a five-year service. Mater Des 33, 476–484.Google Scholar
Chikazumi, S, Ohta, K, Adachi, K, Tsuya, N Ishikawa, Y (1975) Handbook of Magnetic Materials. Tokyo: Asakawa-shoten.Google Scholar
Chun, CM, Desai, S, Hershkowitz, F Ramanarayanan, TA (2014) Materials challenges in cyclic carburizing and oxidizing environments for petrochemical applications. Mater Corro [Werkstoffe Und Korrosion] 65(3), 282–295.Google Scholar
da Silva, IC, da Silva, RS, Rebello, JMA, Bruno, AC Silveira, TF (2006) Characterization of carburization of HP steels by non destructive magnetic testing. Ndt & E Int 39(7), 569–577.Google Scholar
de Almeida, LH, Ribeiro, AF Le May, I (2002) Microstructural characterization of modified 25Cr-35Ni centrifugally cast steel furnace tubes. Mater Charact 49(3), 219–229.Google Scholar
Grabke, HJ (2000) Corrosion by carbonaceous gases, carburization and metal dusting, and methods of prevention. Mater High Temp 17(4), 483–487.Google Scholar
Guan, KS, Xu, H Wang, ZW (2005) Analysis of failed ethylene cracking tubes. Eng Failure Anal 12(3), 420–431.Google Scholar
Guo, JF, Cheng, CQ, Li, HF, Zhao, J Min, XH (2017) Microstructural analysis of Cr35Ni45Nb heat-resistant steel after a five-year service in pyrolysis furnace. Eng Failure Anal 79, 625–633.Google Scholar
Jakobi, D Gommans, R (2003) Typical failures in pyrolysis coils for ethylene cracking. Mater Corro—Werkstoffe Und Korrosion 54(11), 881–886.Google Scholar
Kasai, N, Ogawa, S, Oikawa, T, Sekine, K Hasegawa, K (2010) Detection of carburization in ethylene pyrolysis furnace tubes by a C core probe with magnetization. J Nondestruct Eval 29(3), 175–180.Google Scholar
Kaya, AA, Krauklis, P Young, DJ (2002) Microstructure of HK40 alloy after high temperature service in oxidizing/carburizing environment-I. Oxidation phenomena and propagation of a crack. Mater Charact 49(1), 11–21.Google Scholar
Khodamorad, SH Haghshenas, DF (2012) Inspection of carburization and ovalness in ethylene cracking tubes by using a semi-robot. Eng Failure Anal 25, 81–88.Google Scholar
Kondrat’ev, SY, Anastasiadi, GP, Petrov, SN Ptashnik, AV (2017) Kinetics of the formation of intermetallic phases in HP-type heat-resistant alloys at long-term high-temperature exposure. Metall Mater Trans A – Phys Metall Mater Sci 48A(1), 482–492.Google Scholar
Kondrat’ev, SY, Kraposhin, VS, Anastasiadi, GP Talis, AL (2015) Experimental observation and crystallographic description of M7C3 carbide transformation in Fe–Cr–Ni–C HP type alloy. Acta Mater 100, 275–281.Google Scholar
Konosu, S, Koshimizu, T, Iijima, T Maeda, K (1993) Evaluation of creep-fatigue damage interaction in HK40 alloy. J Mech Des 115(1), 41–46.Google Scholar
Lanz, C, Brizuela, G Simonetti, S (2013) Internal carburisation of an industrial alloy: a quantum chemical study of microstructure’s changes. Mol Simul 39(1), 59–63.Google Scholar
Li, TF (2003) High Temperature Oxidation and Hot Corrosion of Metals. Beijing: Chemical Industry Press.Google Scholar
Luis Otegui, J, De Bona, J Fazzini, PG (2015) Effect of coking in massive failure of tubes in an ethylene cracking furnace. Eng Failure Anal 48, 201–209.Google Scholar
Majumbar, AK (1984) Magnetic phase diagram of Fe80-xNixCr20 (10≤x≤30) alloys. Phys Rev B 29, 4079–4085.Google Scholar
Mamiya, H, Rabajczyk, J, Watanabe, N, Kowalska, A Kitazawa, H (2016) Aging-treatment-induced soft magnetism in nickel-chromium-based superalloy X-750. J Alloys Compd 681, 367–373.Google Scholar
McLeod, AC, Bishop, CM, Stevens, KJ Kral, MV (2015) Microstructure and carburization detection in HP alloy pyrolysis tubes. Metallogr Microstruct Anal 4(4), 273–285.Google Scholar
Miodownik, AP (1982) The effect of magnetic transformations on phase diagrams. Bull Alloy Phase Diagr 2(4), 406–412.Google Scholar
Peng, YC, Zhang, MC, Xiao, JC, Dong, JX Du, CY (2015) Investigations on carburizing mechanisms of Cr35Ni45Nb subjected to different service conditions in a high-temperature vacuum environment. J Mater Res 30(6), 841–851.Google Scholar
Petkovicluton, R Ramanarayanan, TA (1990) Mixed-oxidant attack of high-temperature alloys in carbon-and oxygen-containing environments. Oxid Met 34(5-6), 381–400.Google Scholar
Reihani, A Haghighi, RD (2015) Failure analysis and weld ability improvement of 35%Cr-45%Ni heat resistant alloy. Eng Failure Anal 52, 97–108.Google Scholar
Rodriguez, J, Haro, S, Velasco, A Colas, R (2000) A metallographic study of aging in a cast heat-resisting alloy. Mater Charact 45(1), 25–32.Google Scholar
Sadegh Borjali, SRA Hamed, Khosravi. (2012) Effects of working temperature and carbon diffusion on the microstructure of high pressure heat-resistant stainless steel tubes used in pyrolysis furnaces during service condition. Mater Des 34, 65–73.Google Scholar
Shen, LM, Gong, JM, Jiang, Y Geng, LY (2011) Effects of aging treatment on microstructure and mechanical properties of Cr25Ni35Nb and Cr35Ni45Nb furnace tube steel. Acta Metall Sinica – Eng Lett 24(3), 235–242.Google Scholar
Shen, LM, Gong, JM Liu, HS (2014) Carburisation layer evolution of Fe-Cr-Ni alloy in furnace after long term service: experimental study and numerical prediction. Mater High Temp 31(2), 148–154.Google Scholar
Silva, IC, Rebello, JMA, Bruno, AC, Jacques, PJ, Nysten, B Dille, J (2008) Structural and magnetic characterization of a carburized cast austenitic steel. Scripta Mater 59(9), 1010–1013.Google Scholar
Silva, IC, Silva, LL, Silva, RS, Rebello, JMA Bruno, AC (2007) Carburization of ethylene pyrolysis tubes determined by magnetic measurements and genetic algorithm. Scripta Mater 56(4), 317–320.Google Scholar
Stevens, KJ, Parbhu, A, Soltis, J Stewart, D (2003) Magnetic force microscopy of a carburized ethylene pyrolysis tube. J Phys D Appl Phys 36(2), 164–168.Google Scholar
Sustaita-Torres, IA, Haro-Rodríguez, S, Guerrero-Mata, MP, de la Garza, M, Valdés, E, Deschaux-Beaume, F Colás, R (2012) Aging of a cast 35Cr-45Ni heat resistant alloy. Mater Chem Phys 133(2-3), 1018–1023.Google Scholar
Takahashi, S, Sato, Y, Kamada, Y Abe, T (2004) Study of chromium depletion by magnetic method in Ni-based alloys. J Magn Magn Mater 269(2), 139–149.Google Scholar
Τawancy, ΗΜ (2009) Degradation of mechanical strength of pyrolysis furnace tubes by high-temperature carburization in a petrochemical plant. Eng Failure Anal 16(7), 2171–2178.Google Scholar
Ul-Hamid, A, Tawancy, HM, Mohammed, A-RI Abbas, NM (2006) Failure analysis of furnace radiant tubes exposed to excessive temperature. Eng Failure Anal 13(6), 1005–1021.Google Scholar
Wieczerzak, K, Zywczak, A, Kanak, J Bala, P (2017) Magnetic detection of chromium depleted regions in metastable Fe-Cr-C alloy. Mater Character 132, 293–302.Google Scholar
Wu, XQ, Jing, HM, Zheng, YG, Yao, ZM Ke, W (2001) Coking of HP tubes in ethylene steam cracking plant and its mitigation. Br Corro J 36(2), 121–126.Google Scholar
Wu, XQ, Yang, YS, Zhan, Q Hu, ZQ (1998) Structure degradation of 25Cr35Ni heat-resistant tube associated with surface coking and internal carburization. J Mater Eng Perform 7(5), 667–672.Google Scholar
Xiao, J Zhang, M (2016) Investigations on servicing damage mechanisms of Cr35Ni45Nb alloy under complex conditions. J Mater Res 31(14), 2156–2163.Google Scholar
Young, DJ Zhang, J (2013) Carbon corrosion of alloys at high temperature. J Southern African Inst Min Metall 113(2), 153–158.Google Scholar