An ausformed and tempered 13Cr martensitic stainless steel newly developed for OCTG gives a better SSC resistance and a higher low temperature toughness than the conventional, quenched and tempered 13Cr steel. The value of Sc obtained by the NACE three point bent beam test for the ausformed and tempered 13Cr steel with the yield strength of 640MPa reaches 10.0 (x10ksi) as a result of carbide spheroidization during ausforming, which is compared with 8.0 (x10ksi) for the conventional 13Cr steel with the same strength. This treatment also gives a higher low temperature toughness of 150J in Charpy absorbed energy at 0°C owing to fine microstructure, which is compared with 70J for the conventional 13Cr steel.

Subject
Tubular goods, Materials, Piping, Carbides, Microstructure, Diffusible hydrogen, Steel, Sulfide stress cracking, Hardness, Tempering, Quenching and tempering, Toughness, Yield strength
Keywords:
martensitic stainless steel, seamless pipe, OCTG, ausforming, low temperature toughness, carbon dioxide corrosion, sulfide stress cracking
© 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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