Six different heats were chosen from an archival data base of X52 pipeline steel using a statistical test design to evaluate the microstructure/microchemistry effects of S, P, and C. Additionally, three heats (X65, X70, X80) of a modern steel were added to the test matrix. Crack growth rates were carried out using compact tension specimens in the carbonate/bicarbonate environment at 75°C and under potential control to evaluate the stage II crack growth rates and the Klscc. In general, the microstructure/microchemistry had a small effect on the SCC behavior. However, the three modern steels had a significantly lower Klscc compared to the X52 steels.

Subject
Crack growth, Corrosion rate, Microstructure, Pipelines, Photomicrographs, Fatigue crack growth rate, Stress cracking, Pearlite, Steel, Carbonate stress corrosion cracking, Cracks, Stress corrosion cracking, Inclusions
© 2001 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).
2001
Association for Materials Protection and Performance (AMPP)
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