It is very important to clarify the stress corrosion cracking behavior of low alloy steels for the pressure boundary component materials of LWR primary coolant systems. The slow strain rate tensile test(SSRT) was carried out on three types of heavy-thick low alloy steels in high temperature water containing various levels of dissolved oxygen(DO) to investigate the effects of DO and material factors on the SCC behavior.

The results obtained are as follows; 1) Susceptibility to SCC of each steel increased with DO concentration. 2) The rolled steel with higher impurity concentration had higher susceptibility to SCC at low DO concentration (100 ppb) condition. 3) The forged steel with low impurity level had superior SCC resistance even at high DO concentration(8 ppm) condition.

Subject
Pits, Sulfur, Water, Materials, Crack initiation, Fracture surfaces, Stress strain curves, Heat, Steel, Dissolved oxygen, Stress corrosion cracking, Low alloy steel, High temperature
Keywords:
reactor pressure vessel, low alloy steel, SCC, high temperature water, SSRT, dissolved oxygen, MnS, sulfur content, rolling, forging
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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