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The Use of Gaseous Nitrogen to Improve the Surface Finish of Dilute 6xxx

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The Use of Gaseous Nitrogen to Improve the Surface Finish of Dilute 6xxx Extrusions

Martin Fortier, Dominique Lavoie, Nick Parson, Rio Tinto Alcan Inc., Québec, Canada;
Chris Jowett, Consultant, Kingston, Ontario, Canada

Track: EXTRUSION/DIE, PRACTICAL - Tooling Performance

ABSTRACT --- Many papers have been presented at ET and other conferences
that advocate the benefit of gaseous and liquid nitrogen for improving surface
finish, die life, and extrusion speed. The majority of these were presented by
companies that supply nitrogen or nitrogen generators. While there are many
extruders who see real benefit in the use of both gas and liquid nitrogen, there are
a number who question its efficacy. In considering the use of nitrogen, one has to
separate the effect of tooling and extrudate cooling , and the creation of an inert
atmosphere at the die exit. It is believed that alloy type plays a role and that
gaseous nitrogen shrouding is beneficial to 7xxx and medium strength 6xxx
alloys. There is uncertainty in the industry as to whether gaseous nitrogen has a
real beneficial effect on dilute alloys like AA6063. This paper describes work
specifically aimed at quantifying the benefits that can be gained by gaseous
nitrogen with these dilute alloys.

© Extrusion Technology for Aluminum Profiles Foundation (ET Foundation). All rights reserved. No part of The Proceedings may be reproduced in any form without the express written permission of the ET Foundation.