A study has been made of mill annealed and cold worked duplex Dalmine D22 and D25 stainless steels (75 and 140 ksi) and of cold worked superaustenitic steel Dalmine D28-32 (110 ksi).

The materials have been tested under conditions typical of oil and natural gas wells operating in a severe environment.

The effect of environment variables (T, pCO2, pH2S, NaCl concentration and pH) and of cold working on corrosion properties, particularly SSCC, has been investigated.

Engineering diagrams have been produced for qualification and selection of the material most suitable for use in a given environment.

In the case of the duplex steels, the corrosion mechanisms in relation to environmental variables, applied stress and microstructure have been examined from the microstructure aspect.

Subject
Test methods, Materials, Tubes, Sodium chloride, Acidity, Stress, Sodium chloride solution, U bends, Salt concentration, Steel, Engineering, Acetic acid, Pitting
© 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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