Ph13 8MO vs Ph15 7MO
Property comparison of Ph13 8MO and Ph15 7MO, both stainless steel.
| Property | Ph13 8MO | Ph15 7MO | Difference |
|---|---|---|---|
| Yield strength | 1,310 MPa | 1,138 MPa | -13% |
| Tensile strength | 1,386 MPa | 1,276 MPa | -8% |
| Elastic modulus | 195,122 MPa | 199,948 MPa | +2% |
| Shear modulus | 75,842 MPa | 78,600 MPa | +4% |
| Poisson ratio | 0.28 | 0.28 | 0% |
| Density | 7,723 kg/m³ | 7,667 kg/m³ | -1% |
Difference is Ph15 7MO relative to Ph13 8MO. 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
- PH13-8Mo
- standard
- MIL-HDBK-5J
- heat treatment
- H1000
- 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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