Ethylene production needs maximum cracking of the hydrocarbons at lowest possib[[illegible]] coke formation and carburization, and maximum furnace run length. A number of coatings have been developed to increase the run length by decreasing coke forma[[illegible]] They could show only limited success because of their breakdown and/or diffusion i[[illegible]] the base material during the aggressive operation conditions whereby very high temperature can occur due to exothermic reaction of coke with steam/air.

The plasma powder welded tube provides a 2-3 mm thick overlay of Ni/Cr alloy whi[[illegible]] protects the internal surface of the full tube, including shop and field welds. The diffusion degradation, coking, carburizatrion resistance and high temperature creep were studied. The test results have demonstrated its thermal stability, negligible diffusion into the base material and no detrimental effect on the creep rupture mechanism of the tube material.

Subject
Carburization, Materials, Heaters, Diffusion, Tubes, Plasma, Furnaces, Heat, Powders, Ethylene, Creep, Carbon, Hardness
Keywords:
Carburization, creep, coking, ethylene furnace, plasma powder welding
© 2005 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).
2005
Association for Materials Protection and Performance (AMPP)
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