Patent Number: 6,200,528

Title: Cobalt free high speed steels

Abstract: An alloy steel having the capability of retaining high hardness at elevated temperature for a prolonged time is suitable for use as a high speed tool steel. The alloy steel comprises in % by weight: 0.7-1.4 C; less than 1 Mn; less than 0.04 P; up to 0.7 Si; 3-6 Cr; 4-12 Mo; less than 0.5 Co; 0.5-2.25 V; 1-7 W; up to 1.25 Al; at least one of 0.04-2.5 Nb; 0.025-2.5 Zr; 0.08-4.75 Ta and 0.005-0.7 Ti; balance substantially Fe. The alloy may also have an S content of 0.036-0.300; Mn of 0.30-1.35 and may optionally be treated when in a liquid state with up to 0.05 of Mg or Ca.

Inventors: Rodney; Mark S. (Pittsburgh, PA), Maloney, III; James L. (Greensburg, PA), Waid; George (Orwell, OH)

Assignee: Latrobe Steel Company

International Classification: C22C 38/24 (20060101); C22C 38/26 (20060101); C22C 38/28 (20060101); C22C 38/22 (20060101); C21D 1/18 (20060101); C22C 038/22 (); C22C 038/24 (); C22C 038/28 ()

Expiration Date: 03/13/2018