This paper considers the inter-relationship between the need to avoid environmental cracking in sour service and the consequences of welding C-Mn steels. Attention is paid first to the effect of a fusion welding cycle, and the presence of a welded joint, on the risk of service degradation, and in particular on the risk of sulfide stress corrosion cracking. One of the most obvious and important effects is that of weld area hardness, and the significance of this for different situations and service environments is discussed, along with the roles of chemical composition and residual stress. Second, C-Mn steels designed for sour service commonly have specific compositions primarily to avoid hydrogen pressure induced cracking (HPIC). The extent to which various aspects of chemical composition peculiar to such steels affect their weldability is considered.

Subject
Materials, Composition, Microstructure, Sour environments, Welding, Hardness measurements, Steel, Hardness, Weld metal, Stress corrosion cracking, Residual stress, Hydrogen, Inclusions
Keywords:
sour gas, C-Mn steels, welded joints, process conditions, stress corrosion, hydrogen cracking, composition, weldability
© 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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