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Evaluating Potential Acceleration Tests on Temper Embrittlement of 2.25Cr1Mo Steel for Hydro-Cracking Reactor

[+] Author Affiliations
Jianping Zhao

Nanjing University of Technology, Nanjing, China

Paper No. PVP2008-61460, pp. 223-228; 6 pages
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication, Parts A and B
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4829-6
  • Copyright © 2008 by ASME


Hydro-cracking reactors are the key facilities in hydrogenation units, which were exposed to the action of hydrogen and high pressure and temperature. In this case, hydro-cracking reactor made of 2.25Cr1Mo steel with austenite steel lining at the inner was service for 11 years. Impact energy curve of 2.25Cr1Mo steel will be shifted towards right direction and the material will be damaged. In theory, the value of VTr54.2 is the function of service time and operating temperature and hydrogen partial pressure. In order to assess the damage of 2.25Cr1Mo steel quantitatively, chemical composition examination and step cooling heat-treatment tests were carried out in this paper. After impact tests were performed for material from the test block which was removed from the hydro-cracking reactor with 11 years service, it was found that the continual step cooling curve can not be applicable for exposed material. Therefore, four modified temperature curves as acceleration tests were performed to obtain an embrittled material’s susceptibility for further embrittling. The results show that it is difficult to further embrittle the exposed material with continual step cooling test at 524°C. To accelerate the extent of temper embrittlement in laboratory, it should be prolonged the heat-treatment time or decreased the experimental temperature based on the traditionally step cooling curves.

Copyright © 2008 by ASME



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