Stress orientated Hydrogen Induced cracking (SOHIC) is a manifestation of sulfide stress cracking (SSC) in C-Mn steels by a mechanism involving the linking of planar cracks normal to the primary propagation direction of the crack. It has been known for many years, and the solution has been considered to be the use of hydrogen induced cracking (HIC) resistant steels. Work by the Materials Properties Council has, however indicated that HIC resistant steels may be more susceptible to SOHIC. This raises questions about both the most appropriate steels, and test methods for evaluating them

Published literature has been surveyed, and information pertaining to the mechanisms of SOHIC, with particular reference to the effects of material, fabrication, and service conditions on the risk of cracking, has been extracted. A critical review of this information, along with published information on test methods and results, and information on industrial experience including service failures due to SOHIC, has allowed conclusions to be drawn and recommendations to be made on materials selection, fabrication and testing for resistance to SOHIC.

Subject
Sulfur, Hydrogen induced cracking, Test methods, Materials, Crack initiation, Stress cracking, Hydrogen charging, Stress, Steel, Stress oriented hydrogen induced cracking, Hydrophobic interaction chromatography, Stress corrosion cracking, Hydrogen
Keywords:
SOHIC, Pipeline, Pressure vessel, sour, carbon steel, mechanism of cracking test methods, service failures welding, fabrication
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
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