Corrosion results are presented on the destructive examination of a model steam generator constructed of contemporary and alternative materials and support designs. The model steamed for over one year under representative thermal and hydraulic conditions and accelerated (high seawater contaminant concentrations) steam generator secondary water chemistry.

Denting (reduction in tube diameter), caused by corrosion products, was found in carbon steel and Type 405 SS support plate locations, as well as regions near the secondary face of the A-508 Class 3 tubesheet. Although denting was not detected in the lattice type supports, Type 409 SS was extensively corroded and Type 347 SS exhibited pitting with associated stress corrosion cracking. From a corrosion standpoint, the nickel-based Alloys 600 and 690 performed best overall for support applications. Tubing materials in this test, Alloy 600 in various heat treated conditions, as well as Alloys 690 and 800, exhibited moderate pitting, primarily in the sludge pile region above the tubesheet.

Subject
Pits, Materials, Iron oxide, Oxides, Tubes, Steam generators, Rolling, Sludge, Tubing, Chromium oxide, Corrosion modeling, Heat, Carbon steel
© 1983 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).
1983
Association for Materials Protection and Performance (AMPP)
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