ATI S240 (Martensitic PH) vs Ph13 8MO
Property comparison of ATI S240 (Martensitic PH) and Ph13 8MO, both stainless steel.
| Property | ATI S240 (Martensitic PH) | Ph13 8MO | Difference |
|---|---|---|---|
| Yield strength | 1,482 MPa | 1,310 MPa | -12% |
| Tensile strength | 1,544 MPa | 1,386 MPa | -10% |
| Elongation | 15 % | 10 % | -33% |
| Elastic modulus | 179,300 MPa | 195,122 MPa | +9% |
| Density | 7,770 kg/m³ | 7,723 kg/m³ | -1% |
| Reduction in area | 62 % | 50 % | -19% |
Difference is Ph13 8MO 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 H1000 (538°C)
- grade
- PH13-8Mo
- standard
- MIL-HDBK-5J
- heat treatment
- H1000
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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