A new austenitic nickel-chromium-molybdenum steel, Alloy 31 is combining the advantages of high-chromium alloyed materials, i. e. an excellent resistance to corrosive attack by oxidizing media, with a molybdenum content of more than 6 %. The nickel content is comparatively low. This way, it was possible to create a highly corrosion resistant material in using only small amounts of expensive alloying elements.

The new material exhibits an excellent resistance to pitting and crevice corrosion in neutral and acid aqueous solutions which makes it superior to the known 6 % Mo and other high alloyed stainless steels. In seawater its pitting potential decreases to a greater extent only above 75°C (176°F). Additionally the high molybdenum content does not interfere with the resistance to corrosive attack by oxidizing media which is provided by the high chromium content. Therefore, Alloy 31 lends itself to applications as e.g. heat exchangers or condenser tubes in the Refinery Industry. The new alloy is readily weldable.

Subject
New alloys, Materials, Corrosion resistant alloys, Stainless alloys, Nickel based alloys, Molybdenum alloys, Chromium, Welding, Seawater, Electric potential, Pitting, Corrosion resistance, Stainless steel
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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