Vacuum age hardening of PH grade stainless steels requires two or more steps.
First, the material is solution annealed at temperatures up to 1950℉ in a vacuum
followed by a rapid gas fan cooling down to ambient. The material is then heated to the
aging temperature (between 900℉ and 1150℉ depending on the grade) and held for
several hours. Some grades require cryogenic treatment or other intermediate
NATIONAL HEAT TREAT has two (2) vacuum furnaces capable of vacuum age hardening.