ATI S240 (Martensitic PH) vs Ph15 7MO
Property comparison of ATI S240 (Martensitic PH) and Ph15 7MO, both stainless steel.
| Property | ATI S240 (Martensitic PH) | Ph15 7MO | Difference |
|---|---|---|---|
| Yield strength | 1,600 MPa | 1,138 MPa | -29% |
| Tensile strength | 1,689 MPa | 1,276 MPa | -24% |
| Elastic modulus | 179,300 MPa | 199,948 MPa | +12% |
| Density | 7,770 kg/m³ | 7,667 kg/m³ | -1% |
Difference is Ph15 7MO relative to ATI S240 (Martensitic PH). 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 S11900
- standard
- AMS 5929
- heat treatment
- Solution Annealed + Aged H950 (510°C)
- grade
- PH15-7Mo
- standard
- MIL-HDBK-5J
- heat treatment
- TH1050
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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