22 ~ 25%Cr α-γ duplex phase stainless steels are suitable for CO2-brine system. The pitting resistance in the ferric chloride test at 30°C is improved by means of regulating alloying elements both in a pitting index and a fraction of austenite phase. As concerning the duplex stainless steel, it is preferable to include the term of nitrogen content in the expression of pitting index, e.g. P.I. = Cr + 3Mo + 16N.

By the newly developed welding materials, the pitting resistance of welds could be improved.

Influence of H2S and O2 contamination on CO2 corrosion of duplex stainless steels are also discussed.

Subject
Materials, Welding, Corrosion initiation, Teflon, Crevices, Corrosion behavior, Crevice corrosion, Metals, Pitting, Corrosion resistance, Duplex stainless steel, Stainless steel, Corrosion potential
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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