Effects of H2S concentration and temperature on sulfide stress cracking (SSC) of fine grained 110 ksi (758MPa) grade steel for OCTG compared with API L-80 and C-90 were examined in the NACE solution by means of slow strain rate technique (SSRT) test. The susceptibility to SSC increases with increasing H2S concentration and typical features of cleavage fracture are observed by hydrogen embrittlement. The fine grained 110 ksi (758MPa) grade steel shows the best resistance to SSC in terms of ultimate tensile stress (UTS), and intergranular cracking of this steel is not observed. The 110 ksi (758MPa) grade steel shows maximum susceptibility to SSC at 65 °C in the NACE solution saturated with 100% H2S.

The SSRT test is considered to be suited for evaluating hydrogen embrittlement because the elongation primarily reflects the degree of the embrittlement. In this study, however, the differences of resistance to SSC among the fine grained 110 ksi (758MPa) grade steel, L-80 and C-90 are not obvious in terms of elongation ratio.

Subject
Hydrogen embrittlement, Materials, Hydrogen concentration, Fracture surfaces, Intergranular cracking, Plastics, Elongation, Tensile stress, Steel, Sulfide stress cracking, Cleavage fracture, Grain, Yield strength
Keywords:
Sour gas, Octg, SSC, SSRT, Hydrogen embrittlement
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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