API 13%Cr steel Oil Country Tubular Goods (OCTG) has poor low-temperature toughness, which slows wide application of them in CO2 wells in cold districts. To meet the demand for expanding 13%Cr steel OCTG in such wells, a new ausforming-and-tempering process was developed. Thirteen percent Cr OCTG manufactured with ausforming process, the size being 73.0mm (2-7/8inches) in diameter and 5.50mm (0.217inch) in wall thickness, showed good resistance to sulfide stress corrosion cracking, besides outstanding low-temperature toughness: 80J (60ft-lb) at 0°C (32°F) of the ausformed 13%Cr steel compared with 40J (30ft-lb) of the API 13%Cr steel, and 11.4 x 104psi in Sc of the former steel compared with 9.0 x 104psi of the latter.

Subject
Hydrogen sulfide, Grain size, Tubular goods, Piping, Carbides, Manufacturing, Steel pipes, Steel, Carbon dioxide, Sulfide stress cracking, Tempering, Toughness, Yield strength
Keywords:
Martensitic stainless steel, Oil Country Tubular Goods, Ausforming, Low-temperature toughness, Sulfide stress corrosion cracking, Grain size, Hardness, Hydrogen
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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