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Abstract

A method for manufacturing by powder metallurgy a steel part is provided. A pre-alloyed powder is prepared, having the desired composition for said part, except for the O and N contents and optionally C contents, with O and N contents of at most 200 ppm, and with an Mn content from 0.4 to 2% by weight and a Cr content of less than or equal to 3%; the powder is placed in a container for which the walls define a space, the shape of which corresponds to that of the part, a getter being at the periphery of the powder, said getter has the capability at a high temperature of absorbing and reducing CO and absorbing nitrogen, and a vacuum is applied and the container is then sealed; the container and the powder are brought to a temperature causing sintering of the powder and densification of said powder not exceeding 5%, evolvement of nitrogen and CO from the powder and their absorption by the getter; densification of said powder is achieved by hot isostatic compaction in order to obtain said part; said part is separated from the container and from the getter; and peeling, heat treatment and machining of said part are achieved. The thereby produced steel part is also provided.

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First Claim