12Cr-Ni-Mo steels were tested in the laboratory chloride/sulfide solutions to evaluate their resistance to pitting, chloride SCC and sulfide stress cracking. As for the environmental influences, there appears to be a synergestic effect of H2S and NaCl. H2S has a very adverse effect on pitting and chloride SCC resistances. In many instances chloride SCC is triggered by pits. The new finding in the present work is that double temper treatment is significantly detrimantal to the pitting and SCC resistances while it improves sulfide stress cracking sensitivity as reported elsewhere. The single tempered steel tends to fail intergranularly in either chloride or sulfide solution. The improvement achieved by the double temper is accompanied by the change from intergranular cracking to transgranular quasi-cleavage failure. The metallurgical changes associated with the double tempering were studied and discussed in relation to the results obtained.

Subject
Pits, Intergranular stress corrosion cracking, Sodium chloride, Cracking resistance, Sodium chloride solution, Heat, Steel, Pitting, Corrosion resistance, Sulfide stress cracking, Stress corrosion cracking, Austenite, 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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