A highly corrosion-resistant, nickel-base alloy, which can be age- hardened to 0.2% yield strengths of 120 ksi (827 MPa) and above, has been developed. Strengthening is not dependent on warm or cold working, permitting the through hardening of large section sizes. A high level of ductility and toughness is retained following heat treatment. The alloy resists pitting and crevice corrosion by chlorides, sulfide stress-cracking in the NACE TM-01-77 environment, and stress-corrosion cracking in environments containing NaCl, H2S and S at high pressures and temperatures up to about 425°F (218°C). The alloy also resists crack growth in high-temperature, high-purity water. The corrosion resistance of the alloy is similar to that of cold-worked alloy 625 and superior to that of age-hardened alloy 718 in many environments. The development of the alloy (UNS N07716), as well as mechanical properties, corrosion resistance and microstructure of production heats are discussed.

Subject
Corrosion resistant alloys, Nickel based alloys, Cracking resistance, U bends, Crevice corrosion, Heat, Pitting, Corrosion resistance, Alloys, Heat treatment, Yield strength, Aging, Chloride stress corrosion cracking
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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