Stainless Steel Alloy 17-4 PH, UNS S17400

17-4 PH, also known as UNS S17400, is a martensitic precipitation-hardening stainless steel. 17-4 PH is popular with our customers due to its excellent combination of good corrosion resistance and high strength. In order to be considered 17-4 PH, an alloy must be made of a unique set of chemical elements:

  • Fe Balance
  • Cr 15-17%
  • Ni 3-5%
  • Cu 3-5%
  • Mn 1.5% max
  • Si 0.7% max
  • Nb 0.45% max

Because of 17-4 PH’s unique composition, it has a number of different benefits including offering an excellent combination of oxidation and corrosion resistance along with good mechanical properties at temperatures up to 600°F (316°C). A wide variety of industries utilize the toughness and strength of 17-4 PH. Design engineers in the aerospace, chemical, food processing, metal working, paper and pulp, and petrochemical industries use 17-4 PH to create:

  • Fasteners
  • Gears
  • Castings
  • Fittings
  • Marine Parts (propeller shafts, sailboat self steering systems)
  • Molding dies
  • Nuclear waste casks
  • Turbine blades
  • Valves

Continental Steel is proud to be a distributor of 17-4 PH stainless steel in a number of different shapes and sizes, all of which meet the toughest industrial standards.

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