Martensitic and duplex steels are increasingly used in the gas and oil industries when high CO2 (sweet) environments are encountered. Nevertheless, very often the field conditions make duplex too expensive and traditional 13%Cr steel insufficient due to its poor corrosion resistance.

Some new martensitic stainless steel tubing for Oil Country Tubular Goods (OCTG) with improved general and localized corrosion resistance in sweet environments, were developed.

Exposure tests in autoclave were carried out in environments typical of the North Sea oil fields containing small amounts of H2S to determine sulphide stress cracking (SSC) and localized corrosion resistance. In the tested conditions, the supermartensitic steels 15Cr and 13Cr5Ni2MoN showed no susceptibility to crevice corrosion and was immune to SCC.

Supermartensitic steels proved to be an interesting alternative to the traditional CRAs for use in high chloride, high CO2 gas and oil wells containing H2S in very low concentrations.

Subject
Marine environments, Materials, Sour environments, Sodium chloride, Partial pressures, Sodium chloride solution, Steel, Pitting, Corrosion resistance, Localized corrosion, Sulfide stress cracking, Types of corrosion, Martensitic steel
Keywords:
Oil Country Tubular Goods, Corrosion Resistant Alloys, Martensitic steels, Supermartensitic steels, Localized Corrosion, General Corrosion Index, Stress Corrosion Cracking, Hydrogen Sulphide, Carbon Dioxide
© 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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