Alloyed steel powder with improved degree of sintering for...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/26 (2006.01) B22F 3/16 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01)

Patent

CA 2497920

An alloyed steel powder for metal injection molding that eliminates the problems of decreased product strength and difficulty of temperature control which exist in conventional alloys for sintering and that improves productivity of the sintering furnace is provided, together with a sintered body thereof. This is an alloyed steel powder for metal injection molding which consists as mass percentages of 0.1 to 1.8% C, 0.3 to 1.2% Si, 0.1 to 0.5% Mn, 11 to 18% Cr, 2 to 5% Nb and the remainder Fe and unavoidable impurities, and which may further comprise 5.0% or less of at least one of Mo, V and W, or a sintered body (wherein C is 0.1 to 1.7%) of these powders. As shown in Figures 6 through 9, the alloyed steel powder for metal injection molding of the present invention results in a sintered body with a constant sintered density over a 50°C range of sintering temperatures, thereby facilitating sintering temperature control and improving productivity.

Cette invention concerne une poudre d'acier allié pour moulage de métal par injection caractérisé en ce qu'elle présente, en % de masse, la composition chimique suivante : C : 0,1 à 1, 8 %, Si : 0,3 à 1,2 %, Mn : 0,1 à 0,5 %, Cr 11 à 18 % , Nb : 2 à 5 %, et le reste : Fe et impuretés inévitables : cette poudre se caractérise en outre en ce qu'elle comprend au moins un de Mo, V et W en quantité de 5,0 % en masse ou moins. L'invention concerne également un article fritté tiré de la poudre d'acier allié (à condition que la teneur en C soit comprise entre 0, 1 et 1,7). La poudre d'acier allié de l'invention permet de réaliser des articles frittés présentant une densité de frittage constante sur une plage de températures de frittage de 50 DEG C, comme le montrent les figures 6 à 9. La facilité de maîtrise de la température de frittage se traduit par une amélioration de la productivité et évite la production d'articles à la robustesse réduite.

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