The corrosion performance of two types of weldable martensitic stainless steel seamless pipe for pipeline application is investigated. 11 Cr steel pipe developed for sweet environment gives better resistance to CO2 corrosion than the 13Cr martensitic stainless steel for OCTG. 12Cr steel pipe developed for light sour environment shows good SSC resistance in a mild sour environment and superior CO2 corrosion resistance at high temperature and high CO2 partial pressure condition. The suitable condition for the 11Cr steel pipe and the 12 Cr steel pipe in sweet environment, and the critical pH and H2S partial pressure for the 12 Cr steel pipe welded joint in sour environment are clarified. Both welded joints have superior resistance to hydrogen embrittlement under the cathodic protection condition in sea water.

Subject
Hydrogen embrittlement, Tubular goods, Piping, Cathodic protection, Partial pressures, Acidity, Welded joints, Steel pipes, Steel, Pitting, Corrosion resistance, Sulfide stress cracking, Hydrogen
Keywords:
martensitic stainless steel, CO2 corrosion, sulfide stress cracking, pitting, heat affected zone, cathodic protection, hydrogen embrittlement
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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