The application of duplex stainless steels within ICI began in the early 1970’s. At that time Langley 40V the precursor of Ferralium was being introduced into phosphoric acid production as a pump material, which gave a superior corrosion/erosion resistance compared to 316L in such hostile environments.

At the same time the UNS S31500 duplex alloy was being introduced as a tube material not so much for its corrosion resistance, but to give enhanced performance over carbon steel with better resistance to chloride SCC compared with austenitic 300 series type stainless steels. Since then duplex alloys have gained increasing use as the product forms have increased and the alloys have developed. In addition to their resistance to chlorides their good corrosion resistance in difficult chemical environments has been exploited. This has necessitated ensuring that welded structures have a corrosion resistance matching the parent plate. This paper gives examples of some of the applications and the development of a test procedure based on ASTM G-48 to approve the integrity of the welds in a corrosive environment.

Subject
Materials, Corrosion resistant alloys, Stainless alloys, Ferric chloride, Wiring, Argon, Gas tungsten arc welding, Shielding, Corrosion resistance, Duplex stainless steel, Alloys, Chlorides, Chloride stress corrosion cracking
Keywords:
duplex stainless steels, welds, corrosion resistance, corrosion test procedure
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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