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Developments in Hot Work Tool Steels

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Developments in Hot Work Tool Steels: Looking Beyond the
Basics toward True Savings in Aluminum Extrusion Tooling

Patricia Miller, Bohler-Uddeholm Corporation, Elgin, Illinois, USA
Danny Capo, Bohler-Uddeholm Ltd, Mississauga, Ontario, Canada
Bengt Klarenfjord, Uddeholms AB, Hagfors, Sweden
Franz Russ, Bohler Edelstahl GmbH, Kapfenberg, Austria

Track: EXTRUSION/DIE PRACTICAL - Tooling and Performance

ABSTRACT—The use of conventional H13 tool steel for extrusion dies has been the mainstay
for the industry for years. But demands for longer tool life, longer production runs, lower part
cost, and greater safety in operation have led to the need for new choices in tool steels. This paper
reviews the characteristics of several newer products in their use in extrusion dies, and actual
performance data. As examples, Uddeholm Dievar and Bohler W360 Isobloc will be discussed
with analysis of their improved wear resistance at elevated temperature, hot yield strength and hot
hardness data, temper resistance, bending strength and thermal fatigue properties, as well as creep
strength. These characteristics will be shown, along with the how they influence specific failure
mechanisms in the tooling. Examples of how these properties affect actual performance in the
field will validate their capabilities. In addition, surface treatments for these alloys will be
discussed that enhance their performance.

© 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.