Oil country tubular goods (OCTG) are routinely evaluated for sulfide stress cracking (SSC) resistance. Historically, most qualifications relied on full sour, i.e. 1 bar H2S, to assure sour grades of OCTG for service in the field. Over the past two decades, it has become more routine to evaluate SSC resistance of OCTG, often higher strength grades, using fit-for-purpose (FFP) conditions. The practice of FFP testing of low alloy steels has evolved from methods outlined in EFC(1) 16 to NACE(2) (MR0175/ISO3 15156 - TM0177) and API(4) 5CT. This paper reviews the original practices outlined in EFC 16 and the current range of practices used in industry with regards to the technical validity and conservatism of evaluations performed.

Subject
Test methods, Tubular goods, Materials, Sodium acetate, Corrosion rate, Sodium chloride, Acetates, Acidity, Sodium chloride solution, Solutions, Specimen preparation, Sulfide stress cracking, Low alloy steel
Keywords:
H2S, sour, sulfide stress cracking, acetate buffer, OCTG, Mr0175, Tm0177, DCB
© 2021 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).
2021
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.