SSC resistance of seamless linepipes, assessed by constant load tests, varies significantly with their chemical compositions and microstructures. Rs (ratio of SSC threshold stress to yield strength) of a quenched and tempered linepipe is generally higher than that of a normalized linepipe. SSC in normalized steel proceeds in ferrite grains, suggesting that a major controlling factor of the SSC is intragrain strength or ferrite hardness. From this point of view, the relation of ferrite strength and SSC resistance was investigated. For steels with different strengths which are changed by either precipitation strengthening or solid solution strengthening, an increase in SSC threshold stress is closely correlated with a rise in ferrite hardness, irrespective of grain size and yield strength. Dislocation strengthening also raises ferrite hardness, which leads to an improved SSC resistance. This can be achieved by accelerated cooling and provides excellent toughness.

Subject
Grain size, Precipitation (solids), Dislocation, Linepipe, Density, Chemical composition, Pearlite, Steel, Normalizing, Sulfide stress cracking, Ferrite, Hardness, Yield strength
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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