Nickel-chromium alloys with molybdenum contents up to 16% are evaluated for service in the various environments encountered in flue gas desulfurization (FGD) systems. Both welded and unwelded specimens are exposed in laboratory media simulating FGD and other environments. Effects of weld metal composition and welding procedure are discussed. Of special interest is the corrosion resistance exhibited by a new nickel - 21% chromium - 16% molybdenum - 4% tungsten alloy (INCONEL® alloy 686*). The addition of combined high levels of these alloying elements is made possible by control of minor alloying elements and special processing techniques.

Subject
Weld attack, Materials, Molybdenum, Corrosion resistant alloys, Composition, Corrosion rate, Nickel based alloys, Molybdenum alloys, Flue gas desulfurization, Welding, Base metals, Corrosion resistance, Weld metal
Keywords:
nickel alloys, flue gas desulfurization, welding, corrosion testing, chromium, molybdenum, tungsten, Mu phase, INCONEL® alloy 622*(UNS N06022), INCONEL® alloy 686*
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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