| 摘要 |
The invention relates to a high-speed steel article produced in a powder metallurgical manner, preferably a cutting tool, for high-speed machining of, in particular, light metals and light metal alloys. To increase the heat resistance and ductility as well as to decrease wear, in particular of cutting tools, it is provided according to the invention that a PM article has a high degree of purity corresponding to a value KO of max. 3 as per testing according to DIN 50 602 and the following chemical composition in % by weight: C 1.51 ááto 2.5 Si áááááto 0.8 Mn áááááto 1.5 Cr áá3.5 áááto 4.5 W áá13.3 ááto 15.3 Mo áá2.0 áááto 3.0 V áá4.5 áááto 6.9 Co áá10.05 ááto 12.0 S áááááto 0.52 N áááááto 0.2 0 ááááámax. 100 ppm with a value: manganese minus sulphur (Mn - S) of at least 0.19, iron and production-dependent impurities and accompanying elements as residue, provided that the ratio of the concentrations of tungsten to molybdenum is between 5.2 and 6.5 and that the cobalt content is max. 70 % of the value of tungsten + molybdenum.
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