Overview
17-4 PH (SUS630) is a martensitic precipitation-hardening stainless steel. It reaches tensile strengths above 1000 MPa while retaining corrosion resistance close to 304.
Unlike the 300 series it is magnetic, and its properties can be tuned by aging treatment (H900 to H1150).
Key Properties
Typical values from the MatWeb datasheet for AK Steel 17-4 PH® Precipitation Hardening Stainless Steel, Condition A. Machined parts take the properties of the stock they are cut from.
| Property | Value |
|---|---|
| Density | 7.78 g/cm³ |
| Tensile strength | 1103 MPa |
| Yield strength | 1000 MPa |
| Elongation at break | 5.0 % |
| Hardness | HRC 35 |
Typical Applications
- Aerospace fittings and shafts
- Pump shafts and valve stems
- Molds and tooling
- High-strength corrosion-resistant parts
Machining Notes
Datasheet values are for Condition A; aging after machining raises hardness with minimal distortion. Tell us the target condition.
