Alloy 725 (UNS N07725) is a highly corrosion resistant alloy capable of being age-hardened to 0.2% yield strengths of 100 to 140 ksi (690 to 965 MPa), while maintaining a high level of ductility and toughness1. As alloy 725 is an age-hardenable alloy, large section sizes can achieve uniform hardening throughout the cross section. The alloy is resistant to pitting and stress corrosion cracking (SCC) in environments containing NaCl, H2S and S at temperatures up to about 450° to 500°F (232° to 260°C), and to sulfide stress cracking (SSC) in the NACE TM-0177 environment. The corrosion resistance of alloy 725 is similar to that of cold-worked alloy 625 (UNS N06625) and is superior to that of age-hardened alloy 718 (UNS N07718).

Subject
Marine environments, Materials, Corrosion resistant alloys, Nickel based alloys, Rods, Commercial alloys, Tubing, Corrosion data, Annealing, Alloys, Yield strength, Stress corrosion cracking, Aging
Keywords:
stress corrosion cracking (SCC), hydrogen embrittlement, sulfide stress cracking (SSC), corrosion prevention, INCONEL, gas wells, sour gas environments, hydrogen sulfide, chloride, sulfur
© 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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