General Description
17-4PH is a martensitic, precipitation hardening stainless steel with Cu and Nb additions. The grade combines high strength to approximately 316℃, and a moderate level of corrosion resistance.
17-4PH is capable to obtain a wide range of mechanical properties depending on the precipitation or aging temperature. The corrosion resistance of 17-4PH is similar to 304 stainless steel and superior to that of the 400 series martensitic stainless steels.
Applications of 17-4PH include aircraft structural parts, fasteners, pump shafts, valve parts, chemical process equipment and nuclear components.
Chemical Composition
| Grade | Fe% | Ni% | Cr% | C% | Mn% | Si% | S% | Cu% | Nb% | P% |
|---|---|---|---|---|---|---|---|---|---|---|
| 17-4PH | Bal. | 3.0-5.0 | 15.5-17.5 | Max 0.07 | Max 1.0 | Max 1.0 | Max 0.03 | 3.0-5.0 | 0.15-0.45 | Max 0.035 |
Designations
UNS S17400
Werkstoff Nr. 1.4542
AISI 630
Specifications
17-4PH Bar: ASTM A564
17-4PH Sheet/Plate: ASTM A693
Physical Properties
Density：7.78 g/cm3
Melting Point: 1370°C-1413 °C
Forms
Bar, Ground Rod, Sheet/Plate/Strip are available.
Mechanical Properties
| Heat Treatment | Tensile MPa | Yield MPa | Elongation % | HRC |
|---|---|---|---|---|
| H900 | Min 1314 | Min 1177 | Min 10 | Min 40 |
| H925 | Min 1177 | Min 1070 | Min 10 | Min 38 |
| H1025 | Min 1070 | Min 1000 | Min 12 | Min 35 |
| H1075 | Min 1000 | Min 863 | Min 13 | Min 31 |
| H1150 | Min 932 | Min 725 | Min 16 | Min 28 |