17-4 PH

UNS S17400 stainless
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Precipitation-hardened martensitic stainless with high strength and moderate corrosion resistance. Used in aerospace structural components where high strength and hardness are required.

Applicable Standards

  • AMS 5643
  • ASTM A564
  • UNS S17400

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Fe 73.0 79.0 ~76.0
Cr 15.0 17.5 ~16.25
Ni 3.0 5.0 ~4.0
Cu 3.0 5.0 ~4.0
Nb 0.15 0.45 ~0.3
Mn — 1.0 ~0.5
C — 0.07 ~0.04
Fe 73.0–79.0% Cr 15.0–17.5% Ni 3.0–5.0% Cu 3.0–5.0% Nb 0.15–0.45% Mn 0.0–1.0% C 0.0–0.07%

Typical Applications

  • Aircraft fittings
  • Fasteners
  • Pump shafts
  • Valves
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