15-5 PH

UNS S15500 stainless
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Martensitic precipitation-hardened stainless similar to 17-4 PH but with lower ferrite content for improved through-thickness toughness. Preferred for thicker bar and plate aerospace forgings.

Applicable Standards

  • AMS 5659
  • UNS S15500

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Fe 74.0 80.0 ~77.0
Cr 14.0 15.5 ~14.75
Ni 3.5 5.5 ~4.5
Cu 2.5 4.5 ~3.5
Nb 0.15 0.45 ~0.3
C — 0.07 ~0.04
Fe 74.0–80.0% Cr 14.0–15.5% Ni 3.5–5.5% Cu 2.5–4.5% Nb 0.15–0.45% C 0.0–0.07%

Typical Applications

  • Aerospace forgings
  • Flanges
  • Pressure vessels
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