AMS 5643 is a Specification calling for 17-4 PH in the form of Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings Solution Heat Treated, Precipitation Hardenable
17-4 PH per AMS 5643 is a martensitic, precipitation-hardening stainless steel that provides an outstanding combination of high strength and hardness along with excellent corrosion resistance