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Precipitation hardening stainless steels (also known as PH stainless steels) are one of the five classes of stainless steel grades (along with austenitic, ferritic, martensitic and duplex stainless steel). Precipitation hardening stainless steels are hardenable by heat treatment which causes the precipitation of nanosized particles. The precipitation hardening stainless steel alloys can be subdivided into three further groups depending on their final primary crystalline structure following heat treatment. The hardenability of these alloys is facilitated by particular alloying additions, such as Cu in the alloy 17-4PH.

AISI 600 Series
The most common precipitation hardening stainless steel is 17-4PH