A variety of SSC (sulfide stress cracking) experiments were conducted for three high strength OCTG (oil country tubular goods) steels. The purpose was to examine the correlation between the test results using various SSC test methods. The SSC threshold stress was obtained by the conventional NACE tensile test as a constant load test. Two constant strain tests were performed; the Sc test and the four point bent beam test with and without notches. A four point bent beam test was substituted for a C-ring test. A DCB (double cantilever beam) test was selected as a representative of fracture mechanical tests. The slow strain rate technique was also used.

All tests gave the same order of ranking for SSC resistance of the tested steels in a qualitative manner. However, the SSC critical stress varied markedly depending on the stress application technique. A constant load test gave the lowest value, whereas the notched four point bent beam test with a deep notch resulted in a fairly low SSC critical stress close to that determined by a constant load test. The critical stress condition for SSC will be investigated from the viewpoint of microscopic and macroscopic distributions of stress and strain in the specimens.

Subject
Constant load, Test methods, Strain rate, Tubular goods, Materials, Stress concentration, Correlation, Notches, Stress, Constants, Sulfide stress, Steel, Sulfide stress cracking
Keywords:
sulfide stress cracking, high strength steel, hydrogen sulfide, hydrogen embrittlement, constant load, constant strain, fracture mechanics, slow strain rate technique
© 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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