In Phase I a variety of developmental and commercial tubing alloys and claddings were exposed to laboratory fireside corrosion testing simulating a superheater or reheater in a coal-fired boiler. Phase II (in situ testing) has exposed samples of 347, RA-85H, HR3C, 253MA, Fe3Al + 5Cr, 310 modified, 800HT, NF 709,690 clad, and 671 clad for over 10,000 hours to the actual operating conditions of a 250-MW coal-fired boiler. The samples were installed on an air-cooled, retractable corrosion probe, installed in the reheater cavity, and controlled to the operating metal temperatures of an existing and advanced-cycle, coal-fired boiler. Samples of each alloy will be exposed for 4000, 12,000, and 16,000 hours of operation.

The results will be presented for the metallurgical examination of the corrosion probe samples after 4000 hours of exposure.

Subject
Test methods, Materials, Metal surfaces, Chromium, Walls, Metal wastage, Corrosion losses, Oxide surfaces, Ash, Corrosion probes, Coal, Alloys, Samples
Keywords:
Coal Ash Corrosion, Superheater, Fireside Corrosion, Claddings
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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