Patent ID: 6652617
Filing Date: 2003-11-25
Classification: B22F,C22C

Abstract:
A high-speed steel article produced by powder metallurgy, wherein the steel has a content and configuration of nonmetallic inclusions corresponding to a K0 value according to DIN 50 602 of not higher than 3 and has the following chemical composition in percent by weight:carbon (C)1.51to 2.5silicon (Si)>0to 0.8manganese (Mn)>0to 1.5chromium (Cr)3.5to 4.5tungsten (W)13.3to 15.3molybdenum (Mo)2.0to 3.0vanadium (V)4.5to 6.9cobalt (Co)10.05to 12.0sulfur (S)>0to 0.52nitrogen (N)>0to 0.2oxygen (O)max 100 ppmwith a value of manganese minus sulfur (Mnâˆ’S) of at least 0.19, the remainder being iron and impurities related to the manufacturing process and accompanying elements, provided that the ratio of tungsten to molybdenum (W/Mo) is between 5.2 and 6.5 and the cobalt content is at most 70% of the value of (W+Mo).