a method is disclosed of making sintered parts with cryogenically - produced powder derived from scrap metal , such as machine turnings . the scrap metal is subjected to two impacting operations . the first operation is carried out with the use of a refrigerating agent thereby resulting in comminution of the scrap to a cryogenic powder . the second impacting operation is carried out at ambient temperature conditions utilizing milling elements which impart cold work to at least a portion of the cryogenic powder ; simultaneously , copper is mechanically transferred to substantially each particle of said cryogenic powder to form a continuous copper envelope thereabout . the coated cryogenic powder is then compacted and sintered ; the sintered product may be subjected to hardening or tempering treatments if desired .