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Abstract

A method of producing a die or a die material for extrusion of aluminum profiles, comprising the steps of: providing a first powder, which is a steel powder having the following composition in weight %: C<1.2; Co 6.0-15; Mo 5.0-11.0; Mn 0-1.5; Si 0-1.25; Cr 2-8; Ni 0.5-6.0; P<0.1; balance Fe and unavoidable impurities, said steel powder having a mean particle size of 5-100 um, providing a second powder containing one or more grain growth inhibitors selected among the group comprising carbides, oxides and nitrides, milling at least the steel powder to a mean crystallite size of 20-100 nm, mixing the first and second powders to a powder mixture, wherein the content of the second powder in the powder mixture is in the range of 0.05-2.5 weight %, forming a green body of the powder mixture, and sintering the green body by discharge plasma sintering (SPS), at a temperature in the range of 950-1200° C.

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