Stainless Steel 17-4PH*Stainless Steel 17-4PH offers high strength and hardness along with excellent corrosion resistance. Stainless Steel 17-4PH has been used for a variety of applications including oil field valve parts, chemical process equipment, aircraft fittings, fasteners, pump shafts, nuclear reactor components, gears, paper mill equipment, missile fittings, and jet engine parts.Available forms are seamless pipe, welded pipe, seamless tube, welded tube, bar, wire, sheet, plate, forgings, pipe fittings and flanges.