The corrosion behavior of nickel-base material produced by hot isostatic pressing (HIP) was evaluated under simulated deep, hot, sour well conditions. After initial work involving several HIP nickel-base alloys, Alloy 625 was selected for further testing and was subjected to tests designed to determine resistance to pitting and crevice corrosion, sulfide stress cracking, chloride stress corrosion cracking, and elevated temperature anodic stress cracking. HIP 625 was shown to possess essentially the same corrosion resistance as wrought 625. HIP 625 resisted sulfide stress cracking in the NACE TM-01-77 test at applied stresses as high as 114% of yield and resisted chloride stress corrosion cracking in boiling MgCl2 at stresses up to 100% of yield. In addition, HIP 625 displayed excellent resistance to pitting and crevice corrosion and elevated temperature anodic stress cracking. Mechanical property tests demonstrated that HIP 625 can develop API Type 3 properties, with tensile strengths exceeding 689 MPa (100 ksi), while satisfying the maximum hardness limit of 35 HRC stated in NACE MR-01-75. Heat treatment and HIP processing parameters were shown to influence the corrosion resistance and mechanical properties of HIP 625.

Subject
Materials, Corrosion resistant alloys, Yield stress, Nickel based alloys, Tubes, Solids, Cracking resistance, Mechanical properties, Corrosion resistance, Heat treatment, Wrought metals, Aging, Chloride stress corrosion cracking
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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