Variation in the toughness of 0.50% Mo steel and the presence of low-toughness materials resulting from this variation create problems as the steel which has been widely used for naphtha, kerosene, and light oil hydrotreating reactor vessels.

It was examined the toughness behavior of 0.50% Mo steel, using specimens with various Mo content, C content, and different heat treatment. Moreover, it was investigated the effect of hydrogen attack as a factor in the loss of 0.50% Mo steel toughness. As described in this paper, the examination revealed of that:

  1. The toughness of 0.50% Mo steel varies widely with changes in microstructure and in tempering temperature and, therefore, can be stabilized and improved by properly controlling those conditions.

  2. A low carbon content produces high toughness. However, the carbon content must be determined taking trade-offs with strength into consideration.

  3. It was found that the conditions in (1) increase resistance to hydrogen attack as well, though the deterioration in the toughness occurs due to hydrogen attack.

Subject
Steel structures, Pressure vessels, Materials, Molybdenum, Tempering temperature, Microstructure, Hydrogen attack, Steel, Carbon, Normalizing, Ferrite, Tempering, Toughness
© 1986 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).
1986
Association for Materials Protection and Performance (AMPP)
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