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Paper Information

Title: 

EFFECT OF MICROSTRUCTURE AND HYDROGEN-PERMEABLE ON THE SENSITIVE TO HYDROGEN INDUCED CRACKING CORROSION IN X70 STEEL PIPELINES

Type: PAPER
Author(s): MOHAMMADIYAN RAD REZA,FARZAM MANSUR,LOTFI BEHNAM
 
 
 
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: 

IN THIS STUDY THE INFLUENCE OF MICROSTRUCTURE ON HYDROGEN PERMEABLE AND SENSITIVE TO HYDROGEN-INDUCED CORROSION (HIC) X70 PIPELINE STEEL MICRO-ALLOY ELEMENTS IN AMOUNTS AND WITH DIFFERENT GRAIN SIZES WERE STUDIED IN H2S-CONTAINING ENVIRONMENTS NORMALIZING HEAT TREATMENT OF OPERATIONS AT DIFFERENT TIMES FOR TEMPERATURE AND CHANGES IN MICROSTRUCTURE WERE USED. HIC WAS PERFORMED ON THE SAMPLES AND TEST THE CORROSION RATE WAS MEASURED AS HYDROGEN PERMEABLE. HIC ANALYSIS OF TEST SAMPLES SHOWED THAT THE REFERENCE SAMPLES, SAMPLE 1 AND SAMPLE 3 WAS ABANDONED. THE AMOUNT OF HYDROGEN PERMEABLE FOR SAMPLES 1, 3.2 AND FOR NO. 3 EXAMPLE, ABOUT 4.8 AND THE REFERENCE SAMPLE, 3.6 PPM, RESPECTIVELY. BEEN LEFT IN THE SAMPLE WERE HIGHER THAN THE RATE OF HYDROGEN PENETRATION WHICH, CAN BE CAUSED BY ITS MICROSTRUCTURE AND GRAIN SIZE IS SMALLER IN THEM. MORE FINE GRAINED MICROSTRUCTURE OF THE TRAPPED HYDROGEN, WHICH MAKES HIC IS SUSCEPTIBLE TO CORROSION THAN STEEL. IN GENERAL, LESS THAN A BINIT, HIGHER STRENGTH OF THE FERRITE NEEDLE CAN BE AND SHOWN THAT CAN BE LESS SENSITIVE TO THE FRAGILITY OF HYDROGEN COMPARED TO MARTEN SITE IS QUENCHED AND TEMPER.

 
Keyword(s): HYDROGEN INDUCED CRACKING, HYDROGEN, PERMEABLE, PIPELINE STEEL
 
 
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