Process for the powder metallurgical production of objects

Abstract

The invention relates to a process for the powder metallurgical production of objects from tool steel as well as to such an object. The quality of the material, in particular its homogeneity, its degree of purity, and the properties of the same is/are increased by using the process according to:the invention, in which a melt is placed in a metallurgical vessel and conditioned therein, whereupon a powder with an average grain diameter of 50 to 70 μm is produced from this melt by atomizing it with nitrogen at a temperature that is essentially kept constant, this powder is disintegrated in the nitrogen stream and, while maintaining the nitrogen atmosphere, the powder with a maximum grain diameter of 500 μm is classified, collected, mixed, introduced into a capsule with a diameter or thickness greater than 300 mm and a length greater than 1000 mm, compacted in this container, and the container is sealed in a gas-tight manner, whereupon, in a hot isostatic pressing cycle therefor, the parameters are set such that, in the heating process, the temperature and the pressure are increased and an isostatic pressing process then is carried out and subsequently the HIP pressed blank is cooled and this pressed blank is optionally then hot formed and, in this manner, a highly pure material with a K0 value according to DIN 50 602 of essentially no greater than 3 is produced.

Dependencies are inferred from the claim text.