SCC behavior of two type 13Cr steels was investigated in aqueous CO2/H2S environments. The U-bend tests, constant load tensile tests and corrosion tests were performed in CO2 environments containing different amounts of H2S. In addition, the SSRT tests and hydrogen absorption measurements were made under cathodic hydrogen charge conditions to clarify why l3Cr steels are more susceptible to SCC in H2S environment tnan are low alloy steels.

The 13Cr steels were less resistant to SCC in the CO2/H2S environments than low alloy steels, but some 13Cr steels was not subject to SCC even at a hydrogen sulfide partial pressure of 0.3 atm. Further, it was found that SCC in CO2/H2S environment was caused by hydrogen embrittlement and that the SCC susceptibility of 13Cr steels was affected by their intergranular cracking behavior. Thus, their microstructures and carbide dispersions are important factors to SCC susceptibility of 13Cr steels.

Subject
Intergranular stress corrosion cracking, Tempering temperature, Microstructure, Hydrogen absorption, Acidity, Heat, Steel, Environments, Carbon, Corrosion resistance, Stress corrosion cracking, Hydrogen, Low alloy steel
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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