ATI 15-7 PH (Semi-Austenitic) vs ATI S240 (Martensitic PH)
Property comparison of ATI 15-7 PH (Semi-Austenitic) and ATI S240 (Martensitic PH), both stainless steel.
| Property | ATI 15-7 PH (Semi-Austenitic) | ATI S240 (Martensitic PH) | Difference |
|---|---|---|---|
| Yield strength | 380 MPa | 1,482 MPa | +290% |
| Tensile strength | 860 MPa | 1,544 MPa | +80% |
| Elongation | 30 % | 15 % | -50% |
| Elastic modulus | 195,000 MPa | 179,300 MPa | -8% |
| Density | 7,800 kg/m³ | 7,770 kg/m³ | 0% |
Difference is ATI S240 (Martensitic PH) relative to ATI 15-7 PH (Semi-Austenitic). 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
- UNS S15700
- standard
- AMS 5520
- heat treatment
- Condition A (Solution Annealed)
- grade
- UNS S11900
- standard
- AMS 5929
- heat treatment
- Solution Annealed + Aged H1000 (538°C)
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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