The selection of materials of construction is a major factor in the success of many processes in an oil refinery. Three areas which have substantial impact in selection of materials are corrosion resistance, mechanical properties and economics. Several materials are considered for reactor vessels, heaters, feed-effluent exchangers and hot transfer lines of the hydrotreating processes. Although hydrotreating and hydrodesulfurization processes vary, they all involve using hydrogen to remove sulfur and other impurities from petroleum products at elevated temperatures. There are several corrosion mechanisms which are possible in these processes. Three of these mechanisms are high temperature sulfide corrosion, polythionic acid (PTA) stress corrosion cracking (SCC) and chloride SCC.

Subject
Materials, Intergranular stress corrosion cracking, Corrosion rate, Nickel based alloys, Welding, Sensitization, Corrosion resistance, Stainless steel, Caustic stress corrosion cracking, Annealing, Heat treatment, Stress corrosion cracking, Chloride stress corrosion cracking
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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