A method of converting scrap metal to a powder suitable for making sinterable shapes is disclosed. Scrap metal equivalent to machine turnings, is subjected to a two-cycle process which graduates the conversion of turnings to powder. The scrap metal, in the first cycle, is cooled to a temperature below...http://www.google.fr/patents/US4018633?utm_source=gb-gplus-shareBrevet US4018633 - Cryogenic metal chip reclamation
