Stainless Steel 17-4 PH
Stainless Steel 17-4 PH – Precipitation-Hardening Martensitic Stainless for Aerospace
Stainless Steel 17-4 PH is a precipitation-hardening martensitic stainless steel combining very high strength (up to 1310 MPa tensile) with moderate corrosion resistance. Heat-treatable across H900–H1150 conditions to tune the strength-toughness balance, it is ideal for aerospace fasteners, shafts, and structural fittings requiring stainless properties at high strength levels.
Key Properties
- Tensile Strength: 1310 MPa (H900)
- Yield Strength: 1170 MPa (H900)
- Hardness: 388 HB
- Density: 7.78 g/cm³
- Heat Treatment: H900 through H1150 conditions
- Composition: 17% Cr / 4% Ni
Common Applications
Aerospace fasteners, pump shafts, valve components, turbine parts, gears, and structural fittings requiring high strength in a corrosion-resistant stainless package. Certified to AMS 5643 / ASTM A564.
Material properties
| Material name | Stainless Steel 17-4 PH |
|---|---|
| Type | Stainless Steel |
| Standard code | AMS 5643 / ASTM A564 |
| Tensile strength (MPa) | 1310 |
| Yield strength (MPa) | 1170 |
| Fatigue strength (MPa) | 520 |
| Elongation (%) | 10 |
| Hardness (Brinell) | 388 |
| Density (g/cm³) | 7.78 |
| Electrical resistivity (µΩ·in) | 80 |
| Thermal conductivity (W/m·K) | 18.3 |
| Melting range (°C) | 1400–1440 |
| Weldability | Fair |
| Formability | Poor |
| Shear modulus | 77 |
| Industry code | ss_17_4 |