A new generation of HF Modified stainless steel has been developed for hydrocracker/hydrotreater transfer line piping system applications. The new alloy, CE8N, contains lower carbon and higher nitrogen than previous versions of HF Modified. This new alloy offers improved aged toughness, increased resistance to sensitization, and enhanced polythionic acid-stress corrosion cracking resistance. Strength levels of the new alloy are somewhat below CE20N at temperatures up to 850°F (454°C).

Subject
Materials, Carbides, Precipitation (solids), Stainless alloys, Microstructure, Ferrite content, Chemical composition, Sensitization, Carbon, Corrosion resistance, Stainless steel, Ferrite, Alloys
Keywords:
austenitic stainless steels, polythionic acid, stress corrosion cracking, sensitization, refinery piping, delta ferrite, hydrocracker transfer line piping, hydrotreater transfer line piping
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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