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Precipitation hardening stainless steel refers to a type of high-strength stainless steel, abbreviated as PH steel, in which different types and quantities of strengthening elements are added to the chemical composition of stainless steel, and different types and quantities of carbides, nitrides, carbonitrides, and intermetallic compounds are precipitated through the precipitation hardening process, which not only improves the strength of the steel but also maintains sufficient toughness. Precipitation hardening stainless steel can be classified into three types based on the metallographic structure of its matrix: martensitic, semi austenitic, and austenitic. Precipitation hardened stainless steel has comprehensive properties such as high strength, high toughness, high corrosion resistance, high oxidation resistance, and excellent formability and weldability.