Large diameter pipelines can be laid in deep waters using the J-curve method with a dynamically positioned vessel and a very rapid electron beam welding process. Heavy walled Q&T line pipe steels with minimum specified yield strengths up to 690 MPa (100 ksi) could be required for pipelines laid in deep offshore waters. The feasibility of the application of such grades is examined in light of possible use for pipelines required to carry untreated gas containing H2S and CO2. Using NACE Smooth Tensile Test procedure, three low carbon Ni-Cr-Mo steels quenched and tempered to the yield strength levels of X60, X80 and X100 are assessed for such service. The outcome of the tests favors highly stable structures in both the base metal and the electron beam weldment as best resisting the SSC attack. The stability of such structures is described in terms of hardenability (microstructures and hardness) and the effect of tempering.

Subject
Steel structures, Piping, Microstructure, Welding, Base metals, Steel, Sulfide stress cracking, Ferrite, Hardness, Tempering, Toughness, Yield strength, Weldment
© 1982 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).
1982
Association for Materials Protection and Performance (AMPP)
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