Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 17, No. 2 (July 2004) 183-190   

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  CREEP LIFE ASSESSMENT OF PRIMARY REFORMER HP40-NB MODIFIED STEEL TUBE OF AN AMMONIA PLANT
 
S. A. Jenabali. Jahromi and M. NaghiKhani

Department of Materials Science and Engineering, School of Engineering
Shiraz University, Shiraz, Iran, Jahromi@shirazu.ac.ir
 
 
( Received: August 09, 2003 – Accepted in Revised Form: June 10, 2004 )
 
 

Abstract    Assessment of creep damage and residual creep life of a cast HP 40 Nb Mod. Reformer tube was performed, wherein the experimental Larson–Miller diagram and area fraction of creep voids were adopted. The state of damage of the tube in service was metallographically analyzed by using light and electron microscopy. Samples from the serviced reformer furnace tube were cut and prepared for void examination and creep test at 940ºC-1000ºC under 20-30 MPa stress. Microstructural examination was carried out with an Scanning electron microscope with secondary and backscattered electron detectors. Inter-granular voids in the microstructure of the worked tube as a result of a creep phenomenon are ranked relating to the remaining life.

 

Keywords    Creep Life Assessment, Ammonia Plant, HP40 Nb Modified Steel Tube

 

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