A series of laboratory experiments was conducted on the influence of metallurgical factors such as alloying elements and heat treatments on the corrosion and mechanical behaviors of 13% chromium martensitic stainless steels for oil country tubular goods (OCTG) use. The change in alloying elements for austenitizing from carbon to nitrogen and other austenite-forming alloying elements such as copper, manganese and nickel markedly improved the corrosion resistance of the steel to CO2-containing brine environments at elevated temperature. The mechanical properties required for OCTG application, such as strength and impact toughness, could be obtained by selecting a combination of alloying elements. The influence of the above-mentioned factors and resultant strength on cracking behaviors was also examined.

This new type of martensitic stainless steel will significantly enhance the application limit of the steel to more aggressive environments, i.e. higher temperature, higher CO2 pressure and higher chloride content.

In relation to the improvement of corrosion resistance by alloying, the corrosion process of 13% chromium steels in CO2-containing brine environments is discussed.

Subject
Pits, Tubular goods, Corrosion rate, Microstructure, Aqueous solutions, Alloying elements, Weight loss, Steel, Carbon, Corrosion resistance, Risk reduction, Elements, Martensitic steel
Keywords:
martensitic stainless steel, corrosion, cracking, 13% chromium, high strength, copper, manganese, nickel, carbon dioxide, hydrogen sulfide
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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