17-4 PH is a precipitation-hardening martensitic stainless steel. Heat treated to H900 condition it reaches ~1310 MPa tensile while still providing good corrosion resistance — far stronger than 304 or 316L. Common in aerospace fittings, oilfield tools, and DMLS metal printing.
Mechanical and physical properties
| Property | Value (H900) |
|---|---|
| Tensile strength | 1310 MPa |
| Yield strength | 1170 MPa |
| Elongation at break | 10% |
| Density | 7.78 g/cm³ |
| Hardness | ~44 HRC |
| Machinability rating | Tough |
Typical applications
- Aerospace structural fittings.
- Pump and valve internals.
- Marine fittings under load.
- DMLS-printed turbine and tooling parts.
Related materials
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