17 4PH vs 17 7PH
Property comparison of 17 4PH and 17 7PH, both stainless steel.
| Property | 17 4PH | 17 7PH | Difference |
|---|---|---|---|
| Yield strength | 1,000 MPa | 1,586 MPa | +59% |
| Tensile strength | 1,070 MPa | 1,655 MPa | +55% |
| Elongation | 12 % | 1 % | -92% |
| Elastic modulus | 196,000 MPa | 200,000 MPa | +2% |
| Density | 7,750 kg/m³ | 7,810 kg/m³ | +1% |
| Brinell hardness | 331 HB | 477 HB | +44% |
| Thermal conductivity | 17.9 W/m·K | 16 W/m·K | -11% |
Difference is 17 7PH relative to 17 4PH. 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
- S17400
- standard
- AMS 5643 / ASTM A564
- heat treatment
- H1025
- grade
- S17700
- standard
- AMS 5529
- heat treatment
- CH900
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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