15 5PH vs ATI 15-7 PH (Semi-Austenitic)
Property comparison of 15 5PH and ATI 15-7 PH (Semi-Austenitic), both stainless steel.
| Property | 15 5PH | ATI 15-7 PH (Semi-Austenitic) | Difference |
|---|---|---|---|
| Yield strength | 1,000 MPa | 380 MPa | -62% |
| Tensile strength | 1,069 MPa | 860 MPa | -20% |
| Elongation | 12 % | 30 % | +150% |
| Elastic modulus | 196,000 MPa | 195,000 MPa | -1% |
| Density | 7,780 kg/m³ | 7,800 kg/m³ | 0% |
| Coefficient of thermal expansion | 0.000011 1/K | 0.000014 1/K | +31% |
Difference is ATI 15-7 PH (Semi-Austenitic) relative to 15 5PH. 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
- S15500
- standard
- AMS 5659 / AMS 5862
- heat treatment
- H1025
- grade
- UNS S15700
- standard
- AMS 5520
- heat treatment
- Condition A (Solution Annealed)
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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