The sulfide stress corrosion cracking resistance of low Cr steels was investigated to clarify the application limit in sour environment. The SSC threshold stress of the 0.5%Cr pipe was 95% SMYS which is the same as the Cr-free one. The SSC critical hardness of the 0.5%Cr pipe was about Hv 250 in the 3,000 ppm H2S solution and increased with the decrease in H2S content. The KISSC value of the 0.5%Cr pipe was nearly equal to the Cr-free one. The SSC resistance of the 0.5% Cr pipe was same as the sour resistant Cr-free pipe. The hydrogen penneation rate of the Cr bearing steel was slightly lower than that of the Cr-free steel. This fact is attributed to the difference in corrosion film created on the corrosion surface.

The linepipe steel with the Cr content of 0.5 % proved to have sulfide stress corrosion cracking resistance as large as the sour resistant linepipe steel.

Subject
Hydrogen sulfide, Films, Hydrogen permeation, Piping, Hydrogen concentration, Corrosion rate, Sour environments, Linepipe, Corrosion attacks, Steel, Hydrophobic interaction chromatography, Sulfide stress cracking, Hardness
Keywords:
Sulfide stress corrosion cracking (SSC), Hydrogen induced cracking (HIC), Linepipe, Chromium, Hydrogen sulfide
© 1996 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).
1996
Association for Materials Protection and Performance (AMPP)
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