Carpenter Technology Corporation

Crs Holdings, Inc.

Harrison A Garner, Jr

David E Wert

Gregory J Del Corso

Raymond M Hemphill

Michael L Schmidt

John F McGraw

Bruce A Smith

A tool steel alloy having a unique combination of hardness and toughness is disclosed. The alloy contains, in weight percent, about: wt. % C 1.85-2.30, Mn 0.15-1.0, Si 0.15-1.0, P 0.030 max., S 0-0.30, Cr 3.7-5.0, Ni&plus;Cu 0.75 max., Mo 1.0 max., Co 6-12, W 12.0-13.5, V 4.5-7.5. The balance is essentially iron and usual impurities. The elements C, Cr, Mo, W, and V are balanced in this alloy such that &minus;0.05&lE;&Dgr;C&lE;&minus;0.42 where &Dgr;C&equals;((0.033W)&plus;(0.063Mo)&plus;(0.06Cr)&plus;(0.2V))&minus;C. A powder metallurgy tool steel article made from consolidated alloy powder having the aforesaid weight percent composition provides a Rockwell C hardness of at least about 69.5 when heat treated.

High-hardness powder metallurgy tool steel and article made therefrom

An improved hot work tool steel has higher hardness capability and better temper resistance above 1100 F. and better wear resistance than AISI type H13 and better toughness and ductility then AISI type H10 or type H21. The steel alloy contains essentially the following in weight percent:

Hot work tool steel with good temper resistance

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Elverson, PA, United States of America

Harrison A Garner, Jr