17-4PH (AMS 5643)

17-4PH is a nickel-chromium precipitation-hardening stainless steel suitable for applications requiring much higher strength, toughness and good corrosion resistance. The alloy offers various attractive performance characteristics. The material possesses good stress corrosion resistance, high fatigue resistance and resistance to galling. 17-4PH is readily weldable by all conventional methods, and there is no requirement for pre or post-heating, which is usually the case for standard hardenable stainless steels. A single, low-temperature heat treatment will harden the alloy.

Suitability

17-4PH is highly suitable for applications where the production of intricate parts is a requirement, especially if these parts require machining and welding and have freedom from distortion. Examples include aircraft structural parts, high-performance fasteners, pump shafts, valve stems and gears.

Stock Availability

We stock and supply 17-4PH stainless steel bars in various sizes, shapes and tempers (including annealed, H925, H1000, H1025, H1100 and H1150).