Old vintage 2 1/4Cr-1Mo steels used for high temperature/pressure hydroprocessing pressure vessels have a high potential for temper embrittlement. The cracks caused by hydrogen embrittlement have been experienced in a stainless steel overlay and base metal of hydroprocessing reactors.

In this paper, the temper embrittlement behavior during long term service was discussed using the results of isothermal temper embrittlement tests up to 30,000 hours exposure, and the hydrogen embrittlement susceptibility of base metals, that is, the threshold stress intensity factor KIH and the subcritical crack growth rate behavior were also discussed. Based on the experimental data, the remaining life assessment of 2 1/4Cr-1Mo steel hydroprocessing reactor was analized from a knowledge on hydrogen embrittlement.

Subject
Hydrogen embrittlement, Crack growth, Materials, Tempering temperature, Stress intensity, Reactors, Temper embrittlement, Hydroprocessing, Stress cracking, Base metals, Flaws, Steel, Hydrogen
© 1987 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).
1987
Association for Materials Protection and Performance (AMPP)
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