17 7PH vs ATI 15-7 PH (Semi-Austenitic)
Property comparison of 17 7PH and ATI 15-7 PH (Semi-Austenitic), both stainless steel.
| Property | 17 7PH | ATI 15-7 PH (Semi-Austenitic) | Difference |
|---|---|---|---|
| Yield strength | 1,586 MPa | 1,515 MPa | -4% |
| Tensile strength | 1,655 MPa | 1,690 MPa | +2% |
| Elongation | 1 % | 6 % | +500% |
| Elastic modulus | 200,000 MPa | 195,000 MPa | -3% |
| Density | 7,810 kg/m³ | 7,670 kg/m³ | -2% |
| Thermal conductivity | 16 W/m·K | 15.1 W/m·K | -6% |
Difference is ATI 15-7 PH (Semi-Austenitic) relative to 17 7PH. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- S17700
- standard
- AMS 5529
- heat treatment
- CH900
- grade
- UNS S15700
- standard
- AMS 5520
- heat treatment
- Condition RH 950 (1750°F AC / -100°F hold / 950°F age)
About precipitation-hardening stainless steels
PH grades reach high strength through aging at intermediate temperatures while keeping the corrosion resistance of austenitic or martensitic grades. 17-4 PH and 15-5 PH are the common bar and forging stocks for aerospace and pump shafts. Mechanical properties depend strongly on the aging condition (H900, H1025, H1150).
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