Carburization and oxidation of Fe-Cr-Ni alloys are common issues in petrochemical industry processes. This study investigates the transition between carburization and oxidation behaviors of three different kinds of commercial alloys: austenitic stainless steel UNS S34700, ferritic stainless steel UNS S44600, and Ni based alloy UNS N06025. Equilibrium stable corrosion products, the alloy phases, and their relative amounts for these three alloys were calculated at 1800°F (982°C) in CH4-H2O mixed gas atmosphere. The effects of gas composition, temperature and alloy composition upon phase evolution were investigated.

Subject
Carburization, Carbides, Stainless alloys, Hydrogen concentration, Metal surfaces, Nickel based alloys, Mixtures, Corrosion products, Commercial alloys, Metals, Carbon, Alloys, Oxidation
Keywords:
carburization, oxidation, high-temperature corrosion predictions
© 2007 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).
2007
Association for Materials Protection and Performance (AMPP)
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