Martensitic, chromium-nickel-copper precipitation-hardening stainless steel

17-4 PH grade stainless steel used for applications requiring high strength and a moderate level of corrosion resistance such as; gate valves, chemical processing equipment, steam and gas turbines, pump shafts, gears, cutting utensils and fasteners.

Also known as Alloy S17400, martensitic in structure in the annealed condition and is further strengthened by a low temperature treatment, therefore the grades popularity is due to its high tensile strength, hardness up to 600°F [315°C], corrosion resistance, excellent oxidation resistance up to 1100°F and creep-rupture strength up to 900°F [482°C].