High compressibility iron powder, and iron powder for dust...

B - Operations – Transporting – 22 – F

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B22F 1/00 (2006.01) B22F 3/00 (2006.01) B22F 9/08 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) H01F 1/24 (2006.01)

Patent

CA 2667843

A pure iron powder which contains as impurities, in terms of mass%, up to 0.005% C, 0.01-0.03%, excluding 0.01%, Si, 0.03-0.07% Mn, up to 0.01% P, up to 0.01% S, up to 0.10% O, and up to 0.001% N. The iron powder particles each is composed of up to four crystal grains on the average and have a micro-Vickers hardness (Hv) of 80 or lower on the average. The iron powder is suitable for use in parts with excellent magnetic properties and in high-density sintered parts, has excellent productivity, and has high compressibility. The iron powder preferably has a roundness of 0.7 or higher.

L'invention concerne une poudre de fer pure qui contient en tant qu'impureté, en termes de pourcentage en masse, jusqu'à 0,005 % de C, 0,01-0,03 %, à l'exclusion de 0,01 % de Si, 0,03-0,07 % de Mn, jusqu'à 0,01 % de P, jusqu'à 0,01 % de S, jusqu'à 0,10 % de O, et jusqu'à 0,001 % de N. Les particules de poudre de fer sont chacune composées de jusqu'à quatre grains de cristaux en moyenne et ont une rigidité en micro-Vickers (HV) de 80 au moins en moyenne. La poudre de fer est appropriée pour une utilisation dans des parties avec d'excellentes propriétés magnétiques et dans des parties frittées haute densité, à une excellente productivité et à une compressibilité élevée. La poudre de fer a, de préférence, un émoussé de 0,7 ou plus.

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