15-5PH AMS 5659
15-5 PH AMS 5659 stainless steel is a martensitic precipitation-hardening stainless steel which maintains a high strength to approximately 600 °F. Compared to 17-4 PH, it offers better transverse toughness and ductility: better mechanical properties in larger cross-sections, and better forgeability.
Stock sizes: 0.375” to 8.000” diameter
Common Specifications:
- AMS 5659 TYPE 1
- Pratt & Whitney LCS F-17
- General Electric S-400 / S-SPEC-35
- ASTM-A484
- ASTM-A564; CAP. OF H900
- ASME-SA564; CAP. OF H900
Common Applications:
- Aerospace structural components
- Shafts and gears
- Fasteners
- Valves
Industry Trade Names:
- XM-12
- 15-Cr-5Ni
- UNS S15500
Macrostructure Limits:
| Class | Condition | Severity |
|---|---|---|
| 1 | Freckles | A |
| 2 | White Spots | A |
| 3 | Radial Segregation | A |
| 4 | Ring Pattern | B |
As solution treated the tensile strength shall not exceed 175 ksi and hardness shall not exceed 363 HB.
Composition
| Element | Min. | Max. |
|---|---|---|
| Carbon | — | 0.07 |
| Manganese | — | 1.00 |
| Silicon | — | 1.00 |
| Phosphorus | — | 0.030 |
| Sulfur | — | 0.015 |
| Chromium | 14.00 | 15.50 |
| Nickel | 3.50 | 5.50 |
| Molybdenum | — | 0.50 |
| Copper | 2.50 | 4.50 |
| Columbium (Niobium) | 5xC | 0.45 |
Bars shall be solution heat treated in accordance with AMS-H-6875 by heating to 1900 °F ± 25 °F, holding at heat for a time commensurate with section thickness, heating equipment, and procedure used, and cooling as required to below 90 °F.
AMS 5659 Type 1 = VAR melting process
AMS 5659 Type 2 = ESR melting process
The precipitation heat treat requirements are as follows:
| Condition | Temperature | Time |
|---|---|---|
| H900 | 900 °F ± 10 °F (482 °C ± 6°C) | 1 hour + 15/-0 minutes |
| H925 | 925 °F ± 10 °F (496 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1025 | 1025 °F ± 10 °F (552 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1075 | 1075 °F ± 10 °F (579 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1100 | 1100 °F ± 10 °F (593 °C ± 6°C) | 4 hours + 30/-0 minutes |
| H1150 | 1150 °F ± 10 °F (621 °C ± 6°C) | 4 hours + 30/-0 minutes |
Minimum tensile properties in precipitation heat treated conditions:
Minimum tensile strength properties, inch/pound units
| Condition | Specimen Orientation | Tensile Strength ksi | Yield Strength at 0.2% Offset ksi | Elongation in 2 inches or 4D % | Reduction of Area % |
|---|---|---|---|---|---|
| H900 | Longitudinal Transverse | 190 190 | 170 170 | 10 6 | 35 20 |
| H925 | Longitudinal Transverse | 170 170 | 155 155 | 10 7 | 38 25 |
| H1025 | Longitudinal Transverse | 155 155 | 145 145 | 12 8 | 45 32 |
| H1075 | Longitudinal Transverse | 145 145 | 125 125 | 13 9 | 45 33 |
| H1100 | Longitudinal Transverse | 140 140 | 115 115 | 14 10 | 45 34 |
| H1150 | Longitudinal Transverse | 135 135 | 105 105 | 16 11 | 50 35 |
