15-7 PH (AMS 5520)

15-7PH is a chromium-nickel-molybdenum-aluminium, semi-austenitic precipitation-hardening stainless steel used for applications requiring moderate corrosion resistance and high strength. The alloy is weldable by conventional methods, although the material has less superior weldability than other PH steels, such as 17-4PH, due to the amount of aluminium included in the alloying process. The product retains excellent mechanical properties up to 482°C (900°F). 15-7PH is easily formed in the annealed condition and offers minimum distortion after heat treatment.

Commercial Applications

The alloy is typically used in manufacturing aerospace components and in spring applications where high strength is a requirement. The product also offers high hardness characteristics and superior corrosion resistance compared to standard hardenable stainless steels (410, 420 and 431).

Stock Availability

We stock 15-7PH stainless steel sheets in the annealed condition and offer a wide range of thicknesses which we will process for you in-house.