This paper describes data on the test performance of special clean C-Mn pressure vessel steels in two different wet H2S test environments. Specifically, there has been much published data and testing in the unstressed HIC test (TM0284) and the necessity for special clean steel is well understood1. Recent attention has been placed on the performance of clean steels using the NACE tensile test (TM0177 Method A). It is postulated by some investigators that possible susceptibility to stress-oriented hydrogen-induced cracking (SOHIC), for which there has been little published data and for which the important production characteristics are not well defined, may not be as well understood. The current study supports the hypothesis that HIC and SOHIC are not dependent on one another but may have similar performance-based steel characteristics.

Subject
Pressure vessels, Hydrogen induced cracking, Steel surfaces, Crack propagation, Tensile tests, Stress cracking, Intergranular cracking, Oxide surfaces, Heat, Steel, Stress oriented hydrogen induced cracking, Hydrophobic interaction chromatography, Sulfide stress cracking
Keywords:
carbon steel, hydrogen-induced cracking (HIC), stress-oriented hydrogen-induced cracking (SOHIC), sour service, microstructural banding, clean steel, sulfide stress cracking (SSC), calcium-sulfur ratio, H2S
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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