High-speed steel

Details High-speed steel High-speed steel

C - Chemistry, Metallurgy

22

C

C22C 38/30 (2006.01) C22C 33/02 (2006.01)

Patent

CA 2230718

A steel produced by densified and agglomerated high-purity pre-alloyed powder metallurgy is disclosed. The steel comprises < 1 wt.% of manganese, < 1 wt.% of silicon, 4.50-6.45 wt.% of chromium, 4-6 wt.% of molybdenum, 6.10-6.50 wt.% of vanadium, 18.20-18.70 wt.% of tungsten, ?0.020 of sulphur, ?0.030 of phosphorus, ?100 ppm of oxygen, 5-7 wt.% of cobalt, 0.050-0.080 wt.% of nitrogen, ?0.020 of aluminium and 1.80-1.95 wt.% of carbon. The balance is iron plus the typical impurities arising during steel production. Said steel has a dispersion essentially consisting of carbides such as vanadium MC.

La présente invention a pour objet un acier obtenu par la métallurgie d'une poudre pré-alliée de haute pureté, agglomérée, densifiée. Selon l'invention l'acier a la composition pondérale suivante: Manganèse < 1%, Silicium < 1%; Chrome 4,50-6,45 %, Molybdène 4-6 %, Vanadium 6,10-6,50 %, Tungstène 18,20- 18,70 %, soufre 0,020 %, Phosphore 0,030 %, Oxygène 100 ppm, Cobalt 5-7 %, Azote 0,050-0,080 %, Aluminium 0,020 %, Carbone 1,80-1,95 %. Le complément étant du fer plus les impuretés caractéristiques de la pratique de la fabrication de l'acier, ledit acier ayant une dispersion essentiellement de carbures du type MC de Vanadium.

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