Recently a number of commercial austenitic stainless steels containing up to 6% molybdenum have been developed, but the effect of molybdenum on resistance to stress corrosion cracking has not been established by laboratory tests. Some investigators have claimed that molybdenum increases resistance to stress corrosion cracking1,2  while others have claimed it reduced the resistance.3,4,5,6  However, none of the studies was designed to thoroughly investigate the effect of molybdenum. Furthermore, the studies used boiling MgCl2 which is a very severe environment, capable of cracking many stainless steels, including some used to solve stress corrosion cracking problems.7  The neutral chloride wick test was devised to simulate experience with stress corrosion cracking of austenitic stainless steels when exposed to moist thermal insulation.8  Thus, the wick test is more closely related to service conditions than the boiling MgCl2 test. Another promising test is boiling 25% NaCl acidified to a pH of 1.5 with HCl which can crack T304 in less than one day.

Subject
Molybdenum, Sodium chloride, Transgranular stress corrosion cracking, Cracking resistance, Acidity, U bends, Steel, Corrosion resistance, Stainless steel, Caustic stress corrosion cracking, Chlorides, Stress corrosion cracking, Chloride stress corrosion cracking
© 1980 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).
1980
Association for Materials Protection and Performance (AMPP)
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