In this work the sour gas resistance of an X-80 steel was investigated using a D.C. Potential Drop Technique and modified wedge-opening-loading (WOL) fracture mechanics specimens. Microstructurally, it was found that the steel in the as-received condition consisted of bands of ferrite and pearlite with a uniform distribution of fine inclusions and carbides in the ferritic matrix. Preliminary tests of the sour gas performance of the X-80 were carried out at 25-200°C using the NACE solution and an instrumented autoclave. Measurements of crack propagation rates were made as a function of temperature and material hardness. If the microstructure is modified by a heat treatment the crack propagation is present. When the crack is produced these growth by stress corrosion cracking.

Subject
Crack growth, Water, Materials, Microstructure, Fracture surfaces, Pipelines, Corrosion cracking, Stress cracking, Sodium chloride solution, Steel, Fracture, Cracks, Stress corrosion cracking
Keywords:
Sulphide Stress Cracking, Stress Corrosion Cracking, Potential Drop Technique, Hydrogen Embrittlement, Microalloyed Steels
© 1994 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1994
Association for Materials Protection and Performance (AMPP)
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