Microstructural evaluation of welded fresh-to-aged reformer tubes used in hydrogen production plants

Abbasi, Majid; Park, Ihho; Ro, Yunjo; Nam, Jingak; Ji, Youngsu; Kim, Jaewoong; Ayer, Raghavan

doi:10.1016/j.engfailanal.2018.06.007

Cited by 12 publications

(2 citation statements)

References 33 publications

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“…The present results are also well in agreement with the reported studies. The precipitation of such phases is a precursor to the initiation of creep voids and creep embrittlement of reformer alloys that experienced overheating [7,10,14,15].…”

Section: Resultsmentioning

confidence: 99%

“…The microstructure of as-cast alloys is the austenitic dendritic type with inter-dendritic carbides. In service, when exposed to high temperatures, microstructural changes occur in reformer alloys with precipitation of secondary carbides along with intermetallic secondary phases [9,10,[14][15][16][17][18][19][20][21][22][23][24][25]. The precipitation of secondary phases that occurs during high-temperature service drastically affects the mechanical properties of the reformer tubes [7,8,18,21].…”

Section: Introductionmentioning

confidence: 99%

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Creep Failure of 25Cr-35Ni Centrifugally Cast Reformer Tube

Ravindranath¹,

Akbar²,

Al-Wakaa³

et al. 2023

Failure Analysis - Structural Health Monitoring of Structure and Infrastructure Components

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Cast 25Cr-35Ni alloys are extensively being used in the petrochemical and petroleum refining industries for high-temperature applications. A typical application of such alloys in the industry is in the manufacture of cast catalyst reformer tubes for the production of hydrogen. The cast 25Cr-35Ni catalyst reformer tubes possess the required mechanical properties, creep resistance, oxidation resistance, and high-temperature stability. Though reformer tubes are designed to give a service life of over 100,000 hours at temperatures beyond 900°C, there are incidents of failure due to creep damage, which is the predominant failure mechanism in reformer tubes. The paper discusses an investigation conducted on the premature failure of a 25Cr-35Ni reformer tube. The investigation involved microstructural assessments and the evaluation of mechanical properties. The microstructure and mechanical properties of the service-exposed reformer tube were also compared with a new tube. The investigation revealed that the failure of the tube was due to creep embrittlement. The creep embrittlement was due to the microstructural degradations that occurred as a result of overheating. Adherence to the design and operational parameters is critical in mitigating creep embrittlement failures.

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Section: Resultsmentioning

confidence: 99%