Paper Information

Title: 

LIFE ASSESSMENT OF 25 CR 35 NI-NB REFORMER FURNACES TUBE OF AN PETROCHEMICAL PLAN

Type: PAPER
Author(s): KAZEMPOUR LIASI H.*
 
 *METALLURGY DEPARTMENT, NIROO RESEARCH INSTITUTE (NRI), TEHRAN, IRAN
 
Name of Seminar: INTERNATIONAL CONFERENCE OIL, GAS, PETROCHEMICAL AND POWER PLANT
Type of Seminar:  CONFERENCE
Sponsor:  SHERKATE TAVONI AMOZESHI PAZHOHESHI VESTA
Date:  2012Volume 1
 
 
Abstract: 

REFORMER FURNACES ARE USED IN PETROCHEMICAL INDUSTRY TO PRODUCE HYDROGEN. THEIR MOST CRITICAL COMPONENTS ARE RADIANT TUBES, WHERE EXTREME TEMPERATURE AND PRESSURE CONDITIONS REQUIRED THE HIGH ALLOYED AUSTENITIC HP GRADE STEELS, OWING TO THEIR SUPERIOR STRENGTH TO CREEP RUPTURE AND GOOD CORROSION RESISTANCE.
LIFE ASSESSMENT OF CAST 25 CR 35 NI-NB (HP-40NB), REFORMER TUBE WAS PERFORMED. FOR THIS PURPOSE, THE NATURE OF THE DAMAGE AND THE EXPERIMENTAL LARSON-MILLER DIAGRAM WERE USED. THE NATURE OF DAMAGE OF TUBE IN SERVICE WAS METALLOGRAPHIC ALLY ANALYZED BY USING LIGHT AND SCANNING ELECTRON MICROSCOPY (SEM). SAMPLES FROM THE SERVICED TUBE WERE CUT AND PREPARED FOR STRESS RUPTURED TEST AT 900-1040ºC UNDER 20-30MPA STRESS. MICROSTRUCTURE CHANGES WERE OBSERVED WITH SEM. THERE INCLUDED INTERNAL AND EXTERNAL LAYER OXIDES, NETWORK OF CARBIDES AND ISOLATED/ ORIENTED CAVITIES.

 
Keyword(s): LIFE ASSESSMENT, REFORMER TUBE, HP-40NB, MICROSTRUCTURE CHANGES
 
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