In collaboration with different industrial actors within the European Thermie-project, a new austenitic stainless steel has been developed for use in advanced coal fired power boilers.

The grade is designed for high creep- and oxidation resistance, high structural stability and good fabricability. It can be utilized at temperatures up to around 700°C. The temperature strength is reached by precipitate strengthening through precipitation of fine Nb(C,N), NbCrN, M23C6 and Cu-rich precipitates.

The so far obtained test results indicate that this grade has high oxidation resistance and higher mechanical properties than other known austenitic stainless steels. This paper presents the properties and results from manufacturing and testing during the development and verification of data for the new grade. Also, some results from test installations in coal fired boilers are presented.

Code cases as per The American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section I and Section VIII, are filed for.

Subject
Hot corrosion, Test methods, Materials, Manufacturing, Tubes, Installation, Tensile strength, Reheaters, Boilers, Coal, Creep, Steam, Oxidation
Keywords:
Austenitic stainless steel, Boiler, Superheater, Tube, Creep, Oxidation, Hot corrosion
© 2009 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).
2009
Association for Materials Protection and Performance (AMPP)
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