17-4PH is a very widely used precipitation hardened stainless steel alloy with a toughness especially suited for the aerospace, nuclear energy, and chemical processing industries.
This alloy features good corrosion resistance, hardness, toughness and strength. It is soft and ductile when solution annealed, yet can achieve high properties through precipitation or aging treatment.
These properties make it especially useful for aircraft engines, gears, fittings, fasteners, and valves. 17-4PH is also widely used in nuclear reactor components, paper mill equipment, and oil field parts.
We handle 17-4 PH in a wide variety of forms: rod, bar, plate, sheet/strip, and tube.
Precipitation hardening stainless steels like 17-4PH offer the advantage of machining in the annealed condition. This decreases tool wear and machining time. After machining you can put your parts through an inexpensive heat treatment to get to the desired tensile strength. Shrinkage does occur, but it is slight and predictable. We almost always recommend machining before heat treatment, but for exceptionally close tolerance work you may need to age the material before machining. We can supply 17-4 in any treated condition you need.