Table 1 . Chemical Composition of Typical PM Valve-Seat Materials Content, weight percent METALS JOINING D. Hauser ... Prior to this study, apparently only hot forging had been used to densify such a low-ductility, porous material. ... In these cases, hard particles composed of carbon, tungsten, chromium, cobalt, and iron are dispersed in the ferrous matrix at ... in a mechanical press Presintering ( 2010 F, 30 min) Annealing (1470 F, 60 min) Cold rotary forging Resintering ( 2065 F, anbsp;...