Special low iron Ni-Cr-Mo alloy 625 as a weld overlay material on low alloy steel for well head applications has been successfully used and continues to be used in the sour corrosive environments of the oil/gas industry. The presence of high chlorides, carbon dioxide and hydrogen sulfide combined with high pressures and temperatures necessitated the use of an alloy with a Pitting Resisting Equivalent as defined by PRE = % Cr + 3.3 x % (Mo) of at least 50 or greater. However, in certain sour environments and higher temperatures, alloy 625 reaches its limits and failures have been reported from the field. Another alternative for significantly extending the window of operation and provide better reliability and versatility is offered by a new high chromium, high molybdenum and a very high PRE alloy of the Ni-Cr-Mo family, known as alloy 59 (UNS # N06059). This paper presents the initial test results of a preliminary research program conducted on alloy 59 as a better weld overlay material.

Subject
New alloys, Corrosion resistant alloys, Metal surfaces, Nickel based alloys, Molybdenum alloys, Sour environments, Nickel chromium molybdenum alloys, Surface layers, Surface profile, Corrosion resistance, Deposit corrosion, Alloys, Wrought metals
Keywords:
Alloy 59, UNS # N06059, Alloy 625 UNS # N06625, weld overlay, 4130 steel, oil patch, sour environment, weld surfacing, corrosion resistance
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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