Frequently high-performance corrosion-resistant alloys are specified for severe sour gas wellhead applications where high strength and long term reliability are required. Historically, alloy 625 weld surfacing (overlaying) has been used where severe corrosion is expected. In such severe environments, high levels of carbon dioxide and hydrogen sulfide, as well as high chloride contents, lead to potential pitting, crevice corrosion and stress corrosion cracking problems. During the past several years, service temperatures have increased to the point were alloy 625 has reportedly failed. A cost effective alternative, for providing superior corrosion resistance for such severe sour wellhead equipment, is to use HASTELLOY C-22 welding filler material for surfacing applications.

Subject
Weld attack, Sulfur, Test methods, Materials, Corrosion resistant alloys, Sour environments, Sodium chloride, Crevices, Pitting, Corrosion resistance, Deposit corrosion, Alloys, Stress corrosion cracking
Keywords:
weld surfacing, wellhead, slow strain rate testing, stress corrosion cracking, nickel-base, sour environment
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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