PH Stainless Steels P1 - Guide to Precipitation Hardening Stainless Steels

Today's topic is PH stainless steels.
High strength, excellent corrosion performance, and a simplified heat treatment are advantages of the PH types as compared to the conventional martensitic types we discussed in the last two videos.
PH is short for "Precipitation Hardening" which is a heat treatment that is a bit different from that of the conventional heat treatments. An initial "solution treatment" at high temp .....typically 1900 degrees Farenheight....that assures that all the alloy elements needed for the hardening reaction are uniformly distributed within the metal structure. At these temps the structure is austenitic. From this temperature, the alloy is cooled at a rate that retains the distribution of the hardening elements in solution.
Depending on the chemistry of the specific grade, the resulting structure after the "solution treatment" is martensitic, semi-austenitic, or austenitic. These structures contain more of the hardening elements than would be completely stable. So it's just waiting for an additional heat treatment to cause things to happen within the structure. However, things are stable enough that we can choose to fabricate components prior to a final heat treatment. This additional relatively low temp heat treatment is called "aging". The increased temp and time allow the elements mobility to combine and form the precipitates that then strengthen the structure.

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