Six case histories are presented that describe cracking and corrosion in the weld, HAZ, and base metal of deaerator vessels from various industries. Despite a wide variety of vessel designs and operating conditions, there was a marked similarity in crack characteristics: multiple, primarily transverse, oxide-filled, and often originating from pits. These characteristics are associated with a stress-induced corrosion and corrosion fatigue mechanism.

Residual weld stresses and high localized stresses in vessel designs play a large role in cracking. Operational upsets probably accelerate cracking. No evidence of an embrittlement mechanism or alkaline stress corrosion cracking was found.

Subject
Pits, Water, Nozzles, Storage, Corrosion cracking, Stress cracking, Base metals, Oxide surfaces, Steel, Deaerators, Cracks, Stress corrosion cracking, Samples
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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