17 4PH vs ATI 15-7 PH (Semi-Austenitic)
Property comparison of 17 4PH and ATI 15-7 PH (Semi-Austenitic), both stainless steel.
| Property | 17 4PH | ATI 15-7 PH (Semi-Austenitic) | Difference |
|---|---|---|---|
| Yield strength | 1,000 MPa | 1,380 MPa | +38% |
| Tensile strength | 1,070 MPa | 1,450 MPa | +36% |
| Elongation | 12 % | 6 % | -50% |
| Elastic modulus | 196,000 MPa | 195,000 MPa | -1% |
| Density | 7,750 kg/m³ | 7,670 kg/m³ | -1% |
| Thermal conductivity | 17.9 W/m·K | 15.1 W/m·K | -16% |
| Coefficient of thermal expansion | 0.000011 1/K | 0.000011 1/K | +2% |
Difference is ATI 15-7 PH (Semi-Austenitic) relative to 17 4PH. 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
- S17400
- standard
- AMS 5643 / ASTM A564
- heat treatment
- H1025
- grade
- UNS S15700
- standard
- AMS 5520
- heat treatment
- Condition TH 1050 (1400°F hold / cool to 55°F / 1050°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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