The effects of Si and stabilizing elements addition on the corrosion resistance of austenitic stainless steels in concentrated nitric acid was studied. It was confirmed from the results of corrosion test in 98% nitric acid that low Si steels were attacked severely, but the more the Si contents increased, the more the corrosion resistance improved. The addition of Nb, Zr or Ta to high Si steels was effective, for the improvement of the intergranular corrosion resistance of the steels. From the results of the corrosion test and the mechanical property test, austenitic stainless steels having excellent corrosion resistance in the concentrated nitric acid were developed.

Moreover, the effect of Ni contents of high Cr steels on the degree of the intergranular corrosion in nitric acid with medium concentration was studied.

It was clear by the observation of cross sections of the specimens after corrosion tests that the duplex stainless steels with 40~60% of ferrite contents were the best for the intergranular corrosion resistance.

From these results, the duplex stainless steels having the superior intergranular corrosion in nitric acid with medium concentration were developed.

Subject
Acids, Steel surfaces, Materials, Acid concentration, Tubes, Corrosion testing, Chemical composition, Nitric acid, Heat, Steel, Corrosion resistance, Stainless steel, Intergranular corrosion
© 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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