Many modern pipeline steels require testing for Hydrogen Induced Cracking (HIC) and Sulphide Stress Corrosion Cracking (SSCC) to protect against sour gas and oil. Recent advances in steelmaking and plate rolling have produced material with good resistance at pH 3.5 but with some cracking (HIC) allowed.

As part of an EPRG programme a series of 5 different steels have been tested at 9 different European Laboratories covering susceptible to non susceptible material. Tests were carried out in both 3.5 pH (NACE) and 5.0 pH (BP) Solution. The results showed large variations especially where low levels of cracking were detected.

This work emphasised the need to assess the HIC testing procedure and a number of suggested changes are offered. The paper also describes typical linepipe steel chemistries and current specification testing requirements. There is still a need for further work to ensure a consistent testing procedure in all laboratories.

Subject
Hydrogen induced cracking, Test methods, Materials, Piping, Yield stress, Probability, Variability, Sulfide stress, Mechanical failure, Steel, Scale, Hydrophobic interaction chromatography, Stress corrosion cracking
Keywords:
HIC, Round Robin, Sour Gas, Linepipe, SSCC, Procedure
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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