17-7PH AMS 5644
17-7 PH AMS 5644 is a semi-austenitic precipitation-hardening stainless steel that provides good corrosion resistance, good formability, and high strength. It is commonly supplied in the annealed condition with capability to harden to high strength levels by heat treating to Conditions RH 950 and TH 1050. 17-7PH provides exceptional mechanical properties at temperatures up to 900 °F.
Stock sizes: 0.375” to 3.500” diameter
Common Specifications:
- AMS 5644
- ASTM-A564
- General Electric S-400 / S-SPEC-35
Common Applications:
- Springs
- Washers
- Blades
- Fluid seal springs
The response to heat treatment tensile requirements are:
Minimum Longitudinal Tensile Properties:
| Property | Value |
|---|---|
| Tensile Strength, psi | 170,000 min |
| Yield Strength at 0.2% Offset | 140,000 min |
| Elongation % in 2 in. or 4D | 6 min |
| Reduction of Area | 25 min |
Composition
| Element | Min. | Max. |
|---|---|---|
| Carbon | — | 0.09 |
| Manganese | — | 1.00 |
| Silicon | — | 1.00 |
| Phosphorus | — | 0.040 |
| Sulfur | — | 0.030 |
| Chromium | 16.00 | 18.00 |
| Nickel | 6.50 | 7.75 |
| Aluminum | 0.75 | 1.50 |
