Oil refinery hydrotreating and hydrodesulfurization are high temperature processes which can cause sensitization and/or reduced ductility in some materials of construction, while the presence of sulfur and other impurities in these processes can lead to various corrosion mechanisms. Alloy 825 (UNS N08825) is often used in this demanding application. The effects of long term elevated temperature exposure and welding on the mechanical properties, microstructure and corrosion resistance of this nickel base alloy have been investigated.

Subject
Materials, Corrosion resistant alloys, Corrosion rate, Microstructure, Nickel based alloys, Tubes, Welding, Corrosion resistance, Hardness, Alloys, Heat treatment, Types of corrosion, Chloride stress corrosion cracking
Keywords:
hydrotreating, hydrodesulfurization, petrochemical, corrosion, sensitization, stress corrosion cracking, chlorides, polythionic acid, aging, alloy 825(UNS N08825)
© 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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