Using API 5L X52 to X80 linepipe steels with various microstructures, initiation and propagation of sulfide stress corrosion cracking (SSC) in submerged-arc-welded joints were investigated by NACE tensile SSC tests and full-thickness SSC tests in the 5% sodium chrolide and 0.5% glacial acetic acid solution saturated with hydrogen sulfide gas (NACE TM-01-77 solution). These investigations led to interesting findings that the weld heat affected zone (HAZ) was the most susceptible portion to SSC, and that SSC morphology at welds can be classified into four types, depending on microstructures, HIC susceptibility of base metal, and post weld heat treatment. Typical SSC in HAZ of ferrite-pearlite steels for sour gas service initiated and propagated in the intercritical region of HAZ heated slightly above Ac1 transformation temperature. Metallurgical factors affecting the SSC morphology are also discussed by using samples with thermal cycles of HAZ.

Subject
Microstructure, Linepipe, Thermal cycle, Welding, Crack initiation, Crack propagation, Stress cracking, Base metals, Pearlite, Steel, Hydrophobic interaction chromatography, Sulfide stress cracking, Yield strength
© 1985 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).
1985
Association for Materials Protection and Performance (AMPP)
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